CN102250228A

CN102250228A - Method for improving rice potassium ion efflux antiporter

Info

Publication number: CN102250228A
Application number: CN2011101611738A
Authority: CN
Inventors: 张大兵; 米华玲; 时楠; 梁婉琪; 袁政
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2011-06-15
Filing date: 2011-06-15
Publication date: 2011-11-23
Anticipated expiration: 2031-06-15
Also published as: CN102250228B

Abstract

The invention belongs to the technical field of biological engineering and discloses a method for improving rice potassium ion efflux antiporter. A function mutant strain of rice potassium ion efflux antiporter protein is obtained by a KEA1 gene for mutation control of rice potassium ion efflux and protein encoded by the gene; meanwhile, gamma rays are utilized to treat 9522 strain of japonica rice, and mutants of which the leaf veins are whitened are selected in F2 generation after the rice is planted so as to obtain the function mutant strain of the rice potassium ion efflux antiporter protein. By utilizing the characteristic that the protein participates in chloroplast potassium ion efflux antiporter and controls rice potassium ion transport by a transgenic technology, a new rice stress-resistant line is generated by inhibiting the expression of the protein, and has important application value in agricultural production.

Description

Improve the method that the paddy rice potassium ion effluxes antiport

Technical field

What the present invention relates to is a kind of application of technical field of bioengineering, specifically is the method that the raising paddy rice potassium ion of a kind of KEA1 of utilization gene and proteins encoded thereof effluxes antiport.

Background technology

Paddy rice is one of topmost food crop of China, and it is staple food with rice that there is 60% above population in China, is maximum in the world rice producing country and country of consumption.3,000 ten thousand hectares of China paddy rice year sown areas account for 20% of the world; 1.85 hundred million tons of output account for the nearly 1/3 of the world, 6.35 tons/hectare of yield per unit.Higher by 65% than 3.85 tons/hectare of global mean yields.Paddy rice remains at about 40% of total amount in China's grain yield, occupied nearly half of the country.

Photosynthesis is the basis of crop yield, and chloroplast(id) is as photosynthetic place, and the research of its developmental regulation mechanism is the focus of plant physiology and molecular biology research always.Salting of soil is the major cause that causes the global all kinds of food crop underproduction, and salt stress can make photosynthetic efficiency reduce, and causes the underproduction.Paddy rice is to cultivate the salt tolerant kind that makes new advances in actual breeding as one of important crops to its ion transportation and salt tolerant Study on Mechanism, alleviates grain problem in short supply and lays the foundation.Therefore, the novel paddy rice anti contravariance strain of research seed selection is and its Regulation Mechanism is furtherd investigate, is prerequisite and the basis of further excavating the paddy rice fine quality.

Potassium is the necessary mineral element of growth and development of plants, and farm crop can not grow by normal growth in the soil that lacks potassium element.The raising farm crop are one of important channels that solves potash fertilizer shortage of resources problem to the efficient that absorbs of potassium element.For the proteic research of kalium ion transport, help more to be expressly understood the complicated regulated and control network of ion transport, for promoting the crop alimentary recycle also to have great importance.Suitable high K ⁺/ Na ⁺It is very necessary being compared to and keeping the normal photophosphorylation of chloroplast(id), when sodium ion enters in the cell in a large number, just must reduce sodium ion in the kytoplasm with effective means, keeps ionic equilibrium in the kytoplasm, guarantees the normal physiological function of chloroplast(id).Vegetable cell can pass through to increase the absorption of potassium ion, and then improves the K in the kytoplasm ⁺/ Na ⁺Ratio is alleviated the injury of salt stress.

Existing gene engineering technique is to be applied on the basis that is based upon abundant research of plant development process molecular regulation mechanism and understanding, therefore, the further investigation paddy rice is for chloroplast(id) kalium ion transport mechanism and regulated and control network and to be applied be the basis of research and development novel salt-resistant high-quality strain system on producing.

Summary of the invention

The present invention is directed to the prior art above shortcomings, a kind of method that the paddy rice potassium ion effluxes antiport that improves is provided, utilize KEA1 gene and albumen thereof to participate in the characteristics that the chloroplast(id) potassium ion effluxes antiport, and the characteristic of utilizing transgenic technology control paddy rice potassium ion to transport, produce new paddy rice anti contravariance strain system by suddenling change or suppressing this proteic expression, in agriculture production, have crucial application.

The present invention is achieved by the following technical solutions:

The present invention relates to a kind of paddy rice potassium ion and efflux reverse transport protein, its nucleotide sequence is shown in 1-3465 position among the SEQ ID NO.1.

The present invention relates to a kind ofly have potassium ion and efflux the active polypeptide of reverse transport protein, its aminoacid sequence is shown in SEQ ID NO.2.

The present invention relates to the host cell of above-mentioned translocator, this host cell is an eukaryotic cell, specifically from paddy rice.

The present invention relates to a kind of gene KEA1 that the chloroplast(id) potassium ion effluxes antiport that participates in paddy rice, its nucleotide sequence is shown in 1-3465 position among the SEQ ID NO.1.

The present invention relates to a kind of producing method for seed of the KEA1 mutant based on paddy rice, by utilizing ⁶⁰The Co gamma-rays is handled japonica rice 9522 strains, to the F2 of mutagenesis in generation in one the arteries and veins mutant three generations that bleaches backcross, obtain the KEA1 mutant of the genetic stability of recessive single-gene regulation and control.

Described utilization ⁶⁰The Co gamma-rays is handled the concrete operations step to japonica rice 9522 strains and is meant: utilize ⁶⁰The Co gamma-rays is a mutation source, with the 280Gy treatment dosage, handles japonica rice 9522 seeds.

Described F2 is for being meant: warp ⁶⁰Japonica rice 9522 seeds behind the Co gamma-ray and mutagenesis are sowed after seed soaking, vernalization, and when 30 ages in days, list originally is transplanted into the land for growing field crops, and behind seed maturity, each mutant 1 generation plant is F1 generation, the 3 strain spikes of rice of gathering; Be that seed is sowed respectively to each F1 for strain then, and when 30 ages in days, be transplanted into the land for growing field crops that each single this of strain system is transplanted 24 strains; After transplanting, from nourishing and growing up to the whole process of reproductive growth, each week once therefrom filters out with wild-type in field observation and compares the 2 generations strain system that the phenotype variation occurs, is F2 generation, is numbered, and notes phenotype and separates ratio at last.

The present invention relates to the KEA1 mutant that above-mentioned producing method for seed obtains, its nucleotide sequence is shown in SEQ ID NO.1.

Arteries and veins adaxial and its surface specificity bleaches in the rice mutant kea1 blade that relates among the present invention, and number of chloroplast reduces, irregular arrangement; Under the condition of salt stress, K, Na constituent content are starkly lower than wild-type in the plant, and the K/Na ratio is apparently higher than wild-type.

Kea1 mutant material of the present invention is the conventional japonica rice 9522 process gamma-ray and mutagenesis of being promoted by area, the middle and lower reach of Yangtze River, be the monogenic sudden change of recessiveness, the disappearance (2284～2287bp) of four bases takes place at the 11 exon of KEA1 gene, cause the variation of gene order, produce a nucleotide sequence shown in SEQ ID NO.6, thereby cause KEA1 albumen premature termination (802aa), produce an aminoacid sequence shown in SEQ ID NO.7.

Relate to gene KEA1 among the present invention, its promotor can start the KEA1 gene and express in the whole vascular bundle tissue of plant; The KEA1 gene all has expression at root, stem, leaf, leaf sheath, in spending; This gene knock out the phenotype that can obtain this transgenation; Complementary and the mistake of this gene is expressed the phenotype that all can recover mutant kea1.Illustrate that this gene function is to have influence on that arteries and veins bleaches in the blade of paddy rice really, this influence may be to efflux antiport and realize by regulating the chloroplast(id) potassium ion.

The present invention has tangible effect aspect the antiport excavating and utilize potassium ion to efflux, and can produce the degeneration-resistant system of new paddy rice cross breeding, is used for the new anti-adversity of seed selection, has crucial application in agriculture production.

Description of drawings

The morphological observation synoptic diagram of Fig. 1 kea1 mutant plant.

Fig. 2 kea1 mutant and wild-type 9522 ionic concns are measured synoptic diagram.

Location, Fig. 3 kea1 seat synoptic diagram.

Fig. 4 is complementary to obtain wild-type phenotype synoptic diagram with mistake expression mutant.

The expression pattern synoptic diagram of Fig. 5 KEA1 promotor.

The Subcellular Localization synoptic diagram of Fig. 6 KEA1.

Fig. 7 RNAi obtains the mutation type surface synoptic diagram.

Embodiment

Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.

Acquisition and the morphologic observation of embodiment 1:kea1 mutant plant

This mutant is that this laboratory is used ⁶⁰Co gamma-ray and mutagenesis japonica rice 9522 seeds, treatment dosage is 280Gy.To the F2 of mutagenesis in generation in the blade arteries and veins adaxial and its surface specificity mutant three generations that bleaches backcross, obtain the mutant kea1 of the genetic stability of recessive single-gene regulation and control.All vegetable materials are planted in the test base, Academy of Agricultural Sciences, Shanghai City.

Morphological observation to kea1 mutant plant.As Fig. 1, the phenotype of wild-type and mutant kea1 contrast show wild-type 9522 leaf looks normal (left side) (A, B, C), and in the kea1 mutant blade arteries and veins adaxial and its surface specificity bleach on (right side) (A, B, C); Arteries and veins adaxial and its surface number of chloroplast is a lot of in the wild-type blade, queueing discipline (on) (D), arteries and veins adaxial and its surface number of chloroplast reduces in the mutant kea1 blade, irregular arrangement (descending) is (D); The thylakoid number is a lot of in the wild-type chloroplast(id), queueing discipline (left side) (E), the thylakoid number slightly reduces (right side) (E) in the mutant.

Embodiment 2:kea1 mutant and wild-type 9522 ionic concns are measured

(1) processing of sample.Choose wild-type and mutant the nourish and grow root, stem, leaf, leaf sheath of vigorous period (60d) and the flower (Fig. 2 A) in reproductive growth period, and normal growth and salt handles the over-ground part and the root (Fig. 2 B) of 28d seedling under (handling 3d with NaCl 300mM and KCl 300mM respectively) condition, earlier at the CaCl of 5mM ₂Solution is washed fast in 2 pure water and is washed twice fast, washes fast once in distilled water, and it is inferior to give a baby a bath on the third day after its birth fast in ultrapure water, with thieving paper the moisture on the seedling is blotted then, in the kraft bag of packing into, is put into 90 ℃ of baking ovens, dries to constant weight.

(2) mensuration of paddy rice potassium, Na ion concentration.Material is used scales/electronic balance weighing after drying by the fire well, is put into then in the 50ml centrifuge tube, adds the acetum of 0.1M, and 90 ℃ of water-bath 3h put upside down mixing 5-6 time during water-bath.Pour extracting solution into the 2ml centrifuge tube, 12, the centrifugal 5～10min of 000rpm gets supernatant, is diluted to suitable concentration with distilled water, with Thermo Elemental Sokaar AA type atomic absorption spectrophotometer K ⁺, Na ⁺Content.Twice of each sample replication.Get twice mean value, calculate the K of every milligram of dry weight ⁺, Na ⁺Content (Fig. 2).

The location and the clone of embodiment 3:KEA1 gene

(1) target group.With the hybridization of kea1 and long-grained nonglutinous rice strain Guanglu ai 4, selfing obtains F2 generation, select wherein for the plant that bleaches of arteries and veins adaxial and its surface specificity in the blade be target group.

(2) paddy DNA extracts.Adopt improved CTAB method.Easy steps is as follows: get blade 0.1-0.2 gram (about half sheet) and be put in the little mortar, add an amount of liquid nitrogen, be ground to powdery at once, the 2ml centrifuge tube of packing into, the 1.5xCTAB solution that adds 100 ℃ of preheatings of 700ul is in centrifuge tube, put into 56 ℃ of water-baths behind the careful mixing, take out centrifuge tube after 20 minutes, add equal-volume chloroform/primary isoamyl alcohol, fierce mixing, centrifugal (13000rpm) 10 minutes gets supernatant in new pipe, puts more than half an hour for-20 ℃ behind the adding 900ul dehydrated alcohol mixing.The DNA that separates out is centrifugal, 14000rpm (10 minutes).Remove supernatant, will precipitate with 1ml70% ethanol and clean once, centrifugal drying is dissolved in 200ul 1/10TE or the water, and 4 ℃ of refrigerators are preserved.

(3) InDel molecular marker analysis.This lab design 132 pairs of polymorphism marks, the SSR primer according to reported sequence synthetic ( Http:// www.gramene.org/microsat/ssr.html), other InDel molecule marker designs are according to the nucleotide sequence of having announced that compares 9311 liang of strains of the japonica rice warm and fine long-grained nonglutinous rice of Japan, partial design primer to difference, verify 2 parent japonica rice 9522 and the wide land of the long-grained nonglutinous rice polymorphism between short, the pcr amplification program is: in the 10ul system, and 1ul template, 1ul 10pmol/ulPrimer1,1ul 10pmol/ul Primer2,1ul 10 * Buffer (Mg ²⁺), 1ul 2mM dNTP, 0.1ul Taq, 3.9ul water.PAGE gel electrophoresis by 6%, silver staining method detects.

(4) the first localization method of colony's compartment analysis (bulked segregant analysis).

Use these polymorphism marks and carry out the pcr amplification analysis, find that in 250 target groups mutator gene is chain with MarkerRM5503 and RM2578 performance on No. 4 karyomit(e), further enlarge target group (700) and design other polymorphism mark location and find that this gene is in apart from between the CH413 of 122kb and two Marker of CH415; When target group enlarges 2467 recessive monomers more at last, find that this gene is in apart between the SN10 of 46kb and two Marker of SN11 (Fig. 3 A).In this 46kb scope, 7 candidate genes are arranged, comprising 3 prediction chloroplast(id) gene locations.By these 3 candidate gene sequencing analysis are shown, mutant has the disappearance (Fig. 3 B) of one 4 base in the coding region of Os04g58620 gene, potassium ion of this genes encoding effluxes reverse transport protein KEA1, and this deletion mutantion causes this protein expression premature termination.

With molecule marker the individual plant that bleaches of arteries and veins adaxial and its surface specificity in the blade in the target group is carried out gene type assay, utilize the linkage map (Fig. 3) of the molecule marker of MapDraw V2.1 establishing target gene region.The sequence such as the table 1 of used mark:

Table 1 InDel molecule marker and nucleotide sequence thereof

The functional analysis of embodiment 4:KEA1 gene

For the further function of this gene of checking, change the genome nucleotide sequence of encoded K EA1 gene over to mutant kea1 and wild-type 9522 plant, observe whether to make mutant return to the wild-type phenotype.From the paddy rice fine BAC clone of Japan (OsJNBa0032F06), use primer COM12-1F:5 '

CgggatcccgAATGTTTGTATTTCTATGCTGTTGGTT 3 ' and COM12-3R:5 '

GtcgacTACGGGATGGTAGAAATGGAT 3 ' amplifies the genome sequence fragment of the 11977bp of KEA1 gene shown in SEQ ID NO.4.This fragment is inserted into the binary vector pCAMBIA1301 carrier that is used for rice transformation by BamHI and SalI; Whether sequence verification is correct, and this carrier imports wild-type Agrobacterium EHA105 by electric shock, uses the genetic transformation means to transform mutant kea1 and wild-type 9522 mature embryo callus, can make mutant return to the wild-type phenotype to observe.T ₀In generation, obtain complementary plant, and Fig. 4 shows T ₀The generation complementation is expressed the wild-type phenotype that plant shows with crossing.

Described wild-type Agrobacterium EHA105 is Agrobacterium tumefaciens (Agrobacterium tumefaciens) COM12-p1301, be preserved in Chinese common micro-organisms culture presevation administrative center (CGMCC) on April 29th, 2011, preserving number CGMCC No.4820, preservation mechanism address is: Yard 1, BeiChen xi Road, Chaoyang District, Beijing City institute of microbiology of the Chinese Academy of Sciences, postcode: 100101.

In order further to verify the function of this gene, change the nucleotide sequence of encoded K EA1 gene over to mutant kea1 and wild-type 9522 plant, observe the phenotype that whether can make mutant return to the wild-type phenotype and cross the appearance of expressing K EA1 gene in wild-type.From the paddy rice fine cDNA clone of Japan (J033101J11), use primer OVEX12-9F:5 '

GactagtcATGGATTTGTCTAGGTTTACTGCC 3 ' and OVEX12-9R:5 '

CcttaattaaggTCAAATCGCCAATGCTCCA 3 ' amplifies the cDNA sequence fragment of the 3465bp of KEA1 gene shown in SEQ ID NO.1.This fragment is inserted into by SpeI and PacI transformed the binary vector pCAMBIA1300 carrier that is used for rice transformation that has the Ubiquitin promotor.Structure obtains p1300:Pro _Ubiquitin: the KEA1 carrier, import Agrobacterium EHA105 by electric shock, use the genetic transformation means to transform mutant kea1 and wild-type 9522 mature embryo callus, to observe the phenotype that whether can make mutant return to the wild-type phenotype and cross the appearance of expressing K EA1 gene in wild-type.T ₀In generation, obtained the expression plant, and Fig. 4 shows T ₀Generation complementary (com) and cross expression (ovex) and transform 9522 and the wild-type phenotype that shows of kea1 plant respectively.

Embodiment 5:KEA1 promoter activity is analyzed

From paddy rice 9522 genomes, use primer KEA1-pF:5 '

Cg GgatccCgAATGTTTGTATTTCTATGCTGTTGGTT 3 ' and KEA1-pR:5 '

Catg CcatggCCCCACGCGCCCCCTGTAC 3 ' amplifies and contains the 3018bp fragment of KEA1 promoter sequence shown in SEQ ID NO.3.The KEA1 promotor that amplification obtains is inserted among the binary vector pCAMBIA1301 by BamHI and NcoI.Structure obtains p1301:Pro _KEA1: the GUS carrier is converted in the wild-type 9522 rice callus tissues by agrobacterium mediation method.The expression pattern of the activation analysis KEA1 promotor by analyzing beta-galactosidase, in tiller bud, root, stem, leaf, small ear and the Xiao Hua of genetically modified heterozygote plant, dye by the GUS staining fluid, tissue after the dyeing is handled with 75% ethanol decolorization, finds that KEA1 obstructs (an E left side), spends the vascular bundle in (the E right side) that expression (Fig. 6) is all arranged at tiller bud (A), root (B), stem (a C left side), stipes (the C right side), leaf (a D left side), leaf sheath (the D right side), the branch of paddy rice.

The activation analysis of embodiment 6:KEA1 signal peptide

From the paddy rice fine cDNA clone of Japan (J033101J11), use primer Sig-1F:5 '

CcacatgtggATGGATTTGTCTAGGTTTACTGCC 3 ' and Sig-3R:5 '

GaagatctCTCGGTATTATCGACTACTGAGCC 3 ' amplifies the nucleotide sequence fragment that includes the coded signal peptide of the 300bp of KEA1 gene cDNA sequence shown in SEQ ID NO.5.This fragment is inserted into by AflIII/NcoI and BglII transformed in the binary vector pCAMBIA1301 carrier that has the eGFP label.Structure obtains p1301:Sig _KEA1: the eGFP carrier, import Agrobacterium GV3101 by electric shock, use Agrobacterium injection instantaneous conversion means transformation of tobacco blade, the fluorescence and the chlorophyll autofluorescence situation of observing GFP behind the 48h by laser confocal microscope.Obtain KEA1 albumen by observation analysis and be positioned on the chloroplast(id), the KEA1 signal peptide is included among the 100aa of this 300bp sequence fragment coding (Fig. 7, the location situation as shown by arrows).

Described Agrobacterium GV3101 is Agrobacterium tumefaciens (Agrobacterium tumefaciens) Sig12-10-3-eGFP-p1301, be preserved in Chinese common micro-organisms culture presevation administrative center (CGMCC) on April 29th, 2011, preserving number CGMCC No.4823, preservation mechanism address is: Yard 1, BeiChen xi Road, Chaoyang District, Beijing City institute of microbiology of the Chinese Academy of Sciences, postcode: 100101.

The proteic application of embodiment 7:KEA1

For KEA1 albumen is used, make up the carrier of gene RNAi, and transformed wild-type 9522 plant, in the hope of reducing the expression of KEA1, change the level that potassium ion effluxes in the rice plant thereby reach.From the paddy rice fine cDNA clone of Japan (J033101J11), amplify the specific fragment of the 361bp of KEA1 gene cDNA sequence with primer RI12-1F:5 ' GAGCTCAAGCTTCGATAATACCGAGGACGAAG 3 ' and RI12-1R:5 ' GGATCCCTGCAGCCCGACTGATCCCCTTTT 3 '; With primer RI12-3F:5 '

GAGCTCAAGCTTCTGTGGTGGTCCTGTTGATA 3 ' and RI12-3R:5 '

GGATCCCTGCAGAGAGATTGCTGGGAAGTTTG 3 ' amplifies the conservative property fragment that is in the ionic channel structural domain of the 437bp of KEA1 gene cDNA sequence.With these 2 fragments respectively by HindIII/BamH1 and the forward and reverse pTCK309 carrier that is used for RNAi that is inserted into of SacI/PstI; Sequence verification is correct, and this carrier imports the Agrobacterium EHA105 that the paddy rice anti contravariance strain is by electric shock, uses the genetic transformation means to transform wild-type mature embryo callus.T ₀In generation, obtain the RNAi plant, and Fig. 7 shows T ₀For the mutation type surface that the RNAi plant shows, arteries and veins bleaches in the blade of RNAi paddy rice, and this influence may be to efflux antiport, K/Na than realizing apparently higher than wild-type by regulating the chloroplast(id) potassium ion.

The Agrobacterium EHA105 that described paddy rice anti contravariance strain is is Agrobacterium tumefaciens (Agrobacterium tumefaciens) RI12-1-pTCK309, be preserved in Chinese common micro-organisms culture presevation administrative center (CGMCC) on April 29th, 2011, preserving number CGMCC No.4821, preservation mechanism address is: Yard 1, BeiChen xi Road, Chaoyang District, Beijing City institute of microbiology of the Chinese Academy of Sciences, postcode: 100101.

This shows that the KEA1 gene of being cloned is to cause the bleach gene of phenotype of arteries and veins adaxial and its surface specificity in the kea1 mutant blade.

In sum, present embodiment is by the mutant kea1 that bleaches of arteries and veins adaxial and its surface specificity in the recessive blade of a new paddy rice, by hereditary localization method, be separated to a new chloroplast(id) potassium ion and efflux its gene order of Reverse transship albumens And, this albumen effluxes at the chloroplast(id) potassium ion has tangible effect aspect antiport and the regulation and control leaf look, can utilize this gene can produce the degeneration-resistant strain of new paddy rice cross breeding system by the means generation of genetic engineering, be used for the new anti-adversity of seed selection, in agriculture production, have crucial application potential.

Claims

1. an adjusting paddy rice potassium ion effluxes reverse transport protein, it is characterized in that its nucleotide sequence is shown in 1-3465 position among the SEQ ID NO.1.

2. an adjusting paddy rice potassium ion according to claim 1 effluxes reverse transport protein, it is characterized in that this host cell is an eukaryotic cell, specifically from paddy rice.

3. one kind has potassium ion and effluxes the active polypeptide of reverse transport protein, it is characterized in that its aminoacid sequence is shown in SEQ IDNO.2.

4. one kind according to the described proteic mutation method of claim 1, it is characterized in that, by utilizing gamma-rays japonica rice 9522 strains is handled, and the mutant that vein bleaches is selected in F2 generation in the plantation back, obtains the paddy rice potassium ion and effluxes reverse transport protein.

5. mutation method according to claim 4 is characterized in that, obtains the mutant that potassium ion effluxes antiport by sudden change.

6. the producing method for seed based on the kea1 mutant of paddy rice is characterized in that, by utilizing ⁶⁰The Co gamma-rays is handled japonica rice 9522 strains, to the F2 of mutagenesis in generation in one the arteries and veins mutant three generations that bleaches backcross, obtain the kea1 mutant of the genetic stability of recessive single-gene regulation and control.

7. according to the producing method for seed of the described mutant of claim 6, it is characterized in that described utilization ⁶⁰The Co gamma-rays is handled japonica rice 9522 strains and is meant: utilize ⁶⁰The Co gamma-rays is a mutation source, with the 280Gy treatment dosage, handles japonica rice 9522 seeds.

8. one kind effluxes the application of reverse transport protein according to the described paddy rice potassium ion of claim 1, it is characterized in that, is used to prepare paddy rice anti contravariance strain system.

9. application according to claim 8 is characterized in that, utilizes the RNAi technology to suppress KEA1 expression of gene in the paddy rice, thereby the characteristic in the transportation of control paddy rice potassium ion is produced paddy rice anti contravariance strain system by suppressing this proteic expression.

10. one kind according to Claim 8 or the Agrobacterium EHA105 of 9 described application paddy rice anti contravariance strains system, it is characterized in that, be Agrobacterium tumefaciens Agrobacterium tumefaciens, its preserving number is CGMCC No.4821, and preservation date is: on April 29th, 2011.

11. the application according to the kea1 mutant of the described paddy rice of claim 6 is characterized in that, is used for mutant is returned to the wild-type phenotype.

12. an application of eliminating the kea1 mutant of the described paddy rice of claim 11 is characterized in that, by the genome sequence fragment shown in the SEQ ID NO.4 is inserted into the binary vector pCAMBIA1301 carrier that is used for rice transformation by BamHI and SalI; And carrier imported Agrobacterium EHA105 by electric shock, use the genetic transformation means to transform mutant kea1 and wild-type 9522 mature embryo callus are achieved.

13. wild-type Agrobacterium EHA105 who obtains according to claim 11 or 12 described application, it is characterized in that, be Agrobacterium tumefaciens 4grobacterium tumefaciens, its preserving number is CGMCC No.4820, and preservation date is: on April 29th, 2011.

14. one kind according to the described proteic application of above-mentioned arbitrary claim, it is characterized in that, is used for KEA1 albumen is positioned at chloroplast(id).

15. application according to claim 14 is characterized in that, described chloroplast(id) is from tobacco leaf.

16. according to claim 14 or 15 described application, it is characterized in that, by primer amplification SEQ ID NO.5 as albumen chloroplast(id) localization signal peptide, this fragment is inserted into to transform in the binary vector pCAMBIA1301 carrier that has the eGFP label to make up by AflIII/NcoI and BglII obtains the p1301:SigKEA1:eGFP carrier, import Agrobacterium GV3101 by electric shock, use Agrobacterium injection instantaneous conversion means transformation of tobacco blade to be achieved.

17. application according to claim 16 is characterized in that, described primer sequence is:

Sig-1F：5′ccacatgtggATGGATTTGTCTAGGTTTACTGCC?3′，

Sig-3R：5′gaagatctCTCGGTATTATCGACTACTGAGCC?3′。

18. Agrobacterium GV3101 who obtains according to arbitrary described application in the claim 14 to 17, it is characterized in that, be Agrobacterium tumefaciens Agrobacterium tumefaciens, its preserving number is CGMCC No.4823, and preservation date is: on April 29th, 2011.