CN116694659B - GhTPPA2基因在促进植物叶片中可溶性糖和淀粉积累的应用 - Google Patents
GhTPPA2基因在促进植物叶片中可溶性糖和淀粉积累的应用 Download PDFInfo
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Abstract
本发明属于植物基因工程领域,具体公开了核苷酸序列如SEQ ID NO.1所示的GhTPPA2基因在促进植物叶片中可溶性糖积累方面的用途,以及在淀粉积累方面的用途。通过转基因方法将超表达GhTPPA2基因的遗传载体导入到烟草、棉花等植物中,可使烟草、棉花等植物叶片中可溶性糖含量和淀粉含量获得显著提升,从而显著提高烟草、棉花等植物对干旱、寒冷、盐碱等非生物逆境的抗性,显著提高作物的产量和经济效益,因而具有广泛的应用价值。
Description
技术领域
本发明属于植物基因工程领域,具体涉及GhTPPA2基因在促进植物叶片中可溶性糖和淀粉积累方面的用途。
背景技术
可溶性糖是指葡萄糖、果糖、麦芽糖、蔗糖和海藻糖等易溶于水的糖。可溶性糖在植物的生命周期中具有重要作用,它不仅为植物的生长发育提供能量和代谢中间产物,而且具有信号功能。可溶性糖还是植物体内重要的渗透调节物质,与植物的抗逆性(如抗寒性、抗旱性等)密切相关。
海藻糖(Trehalose,简称为Tre)是一种典型的应急代谢物,能够在高温、高寒或干旱等恶劣条件下在细胞表面形成特殊的保护膜,有效地保护生物分子结构不被破坏,从而维持生命体的生命过程和生物特征。6-磷酸海藻糖(Trehalose-6-phosphate,简称为Tre6P)可作为细胞内可利用糖水平的指示信号,参与糖稳态调节。改变植物内源Tre代谢水平可以优化源库关系,对作物产量提升展现出巨大潜力。6-磷酸海藻糖磷酸酶(Trehalose-6-phosphate phosphatase,亦称为海藻糖-6-磷酸磷酸酶,简称为TPP)可将Tre6P水解为Tre。对水稻、玉米或拟南芥等研究表明过表达TPP基因可显著提高植株对干旱、寒冷或盐胁迫的耐受性并增加作物产量。
在陆地棉中具有TPP结构域的基因共有50个,其中TPS(Trehalose-6-phosphatesynthase,6-磷酸海藻糖合成酶,简称TPS)基因家族有26个成员,TPP基因家族有24个成员。
经检索,没有发现有关棉花TPP基因促进可溶性糖和淀粉在植物叶片中积累方面作用的报道。
发明内容
本发明人在对棉花TPP基因家族24个成员的研究中意外发现,棉花TPP基因家族的GhTPPA2基因在棉花叶片和棉铃中优势表达;进一步研究发现该基因促进可溶性糖和淀粉在叶片中的积累,从而提高植物的非生物逆境抗性,尤其是干旱耐受性及逆境胁迫后的生长恢复有很大的作用。本发明是在上述意外发现的基础上完成的。
本发明目的在于提供核苷酸序列如SEQ ID NO.1所示的GhTPPA2基因或氨基酸序列如SEQ ID NO.2所示的GhTPPA2蛋白在促进植物叶片中可溶性糖积累或/和淀粉积累上的应用。
上述应用中所述的植物是指棉花、烟草、水稻或玉米等。
本发明还提供了核苷酸序列如SEQ ID NO.1所示的GhTPPA2基因或氨基酸序列如SEQ ID NO.2所示的GhTPPA2蛋白在培育叶片中可溶性糖含量高或/和淀粉含量高的植物上的应用。
本发明还提供核苷酸序列如SEQ ID NO.1所示的GhTPPA2基因或氨基酸序列如SEQID NO.2所示的GhTPPA2蛋白在培育抗逆性强的植物上的应用。
上述应用中所述的植物是指棉花、烟草、水稻或玉米等。
所述的抗逆性是指耐旱性、耐寒性或耐盐性等。
本发明还提供含有核苷酸序列如SEQ ID NO.1所示的GhTPPA2基因的超表达载体在促进植物叶片中可溶性糖积累或/和淀粉积累上的应用。
所述的超表达载体是指pCambia2300、pCambia2301、pBI121、pCAMBIA1300或pCAMBIA1301等。
上述应用中所述的植物是指棉花、烟草、水稻或玉米等。
本发明还提供了含有核苷酸序列如SEQ ID NO.1所示的GhTPPA2基因的农杆菌在促进植物叶片中可溶性糖积累或/和淀粉积累的应用。
上述应用中所述的植物是指棉花、烟草、水稻或玉米等。
本发明所述的应用,首先将从棉花中克隆出来的GhTPPA2基因构建到超表达载体上,再借助农杆菌遗传转化到烟草或棉花等植物中。
本发明具有的优点和有益技术效果:本发明超表达棉花GhTPPA2基因可使棉花、烟草等植物叶片中可溶性糖含量和淀粉含量获得显著提升,从而显著提高棉花、烟草等植物对干旱、寒冷、盐碱等非生物逆境的抗性,为培育耐旱、耐寒、耐盐碱等抗逆性强的植物新品种提供了新途径;同时,可溶性糖和淀粉是光合作用主要产物,还可以作为重要的能源物质,显著提高作物的产量和经济效益,具有广泛的应用价值。
附图说明
图1.GhTPPA2蛋白亚细胞定位荧光照片。
图2.超表达GhTPPA2基因烟草的分子检测电泳图谱;其中M为Marker;“+”为载体阳性对照;“-”为野生型受体材料NC89;1-12为转基因材料。
图3.超表达GhTPPA2基因烟草的分子检测电泳图谱;其中M表示Marker;“+”为载体阳性对照;“-”为野生型受体材料NC89;1-4为转基因材料。
图4.超表达GhTPPA2基因烟草T0代植株qRT-PCR定量表达量检测柱形图;1为野生型受体材料NC89;2、3、4、5分别是指转基因材料TPPOE-1、TPPOE-2、TPPOE-3和TPPOE-4。
图5.本发明超表达GhTPPA2基因的T1代烟草植株叶片中可溶性糖含量柱形图;其中1是指野生型材料NC89;2是指转基因材料TPPOE-4。
图6.本发明超表达GhTPPA2基因的T1代烟草植株叶片中淀粉含量柱形图;其中1是指野生型材料NC89;2是指转基因材料TPPOE-4。
具体实施方式
如无特殊说明,以下实施例中所用试剂均为常规化学试剂,均可于市场上购买。如无特殊说明,以下实施例中所述方法均为本领域技术人员熟知的常规实验方法,或按照产品说明书操作。
通过Trehalose_PPase结构域(PF02358)在陆地棉(Gossypium hirsutum)中检索得到棉花TPP基因家族(简写为:GhTPP)中有24个基因。通过在线蛋白理化性质预测(https://web.expasy.org/)和在线蛋白结构域预测等(http://smart.embl- heidelberg.de/)发现GhTPPA基因在陆地棉中共有4个同源基因。同时,通过对陆地棉TPP基因家族成员在各组织中相对表达水平由pheatmap R包进行可视化分析发现,GhTPPA同源基因中的一个基因在叶片和棉铃中优势表达,将其命名为:GhTPPA2。
参考棉花基因组序列,设计带有15bp载体同源序列的In-fusion连接引物对该GhTPPA2基因的CDS全长进行PCR扩增,所述引物序列如下:
GhTPPA2-F:
5’-ATTTGGAGAGGACAGGGTACCATGGACCTGAAATCCAATCACAC-3’(SEQ ID NO.3),
GhTPPA2-R:5’-ACCTTCACCGGATCCGAGAACACTTGTCTTCTTCC-3’(SEQ ID NO.4)。
对克隆产物进行无缝克隆重组,并连接到带有RFP标签的pCambia2300质粒载体上,获得含有GhTPPA2基因的质粒表达载体。
测序结果显示,GhTPPA2基因的核苷酸序列如SEQ ID NO.1所示;该基因编码的蛋白质的氨基酸序列如SEQ ID NO.2所示。
实施例1GhTPPA2基因的克隆及组织表达鉴定
(1)RNA提取与cDNA合成
按照产品说明书所述方法用植物RNA提取试剂盒(购于北京天根公司)从陆地棉品种TM-1(中国农业科学院生物技术研究所保存)叶片中提取总RNA,然后用逆转录试剂盒(HiScript III 1st Strand cDNA Synthesis Kit,购自南京诺唯赞公司)以总RNA为模板合成cDNA。将合成所得的cDNA保存于-20℃,备用。
(2)GhTPPA2基因的筛选和鉴定
陆地棉基因组中共有24个GhTPP成员,根据转录组数据,不同GhTPP成员存在明显的组织表达差异,其中来自At亚基因组的GhTPPA2(Gh_A12G223300.1)在叶片组织中优势表达,两者在序列上高度一致,另外,GhTPPA2在棉铃发育过程中具有更高的表达水平,所以将GhTPPA2作为候选基因。
以步骤(1)中提取的cDNA为模板,以GhTPPAGFP-F和GhTPPAGFP-R为引物进行PCR扩增。所述引物为:
GhTPPAGFP-F:5’-acgggggactcttgaccatggggATGGACCTGAAATCCAATCACAC-3’(SEQID NO.5);
GhTPPAGFP-R:5’-tactagtcagatctaccatgggGAGAACACTTGTCTTCTTCCAATTCA-3’(SEQ IDNO.6)。
其中PCR反应体系(50μL):高保真Mix(南京诺唯赞公司)25μL,cDNA模板1μL,无缝克隆正反向引物各1μL,ddH2O 22μL。PCR反应程序:95℃预变性5min;95℃变性15s,56℃退火15s,72℃延伸15s,循环30次;72℃终延伸1min。将所得PCR扩增产物在1%琼脂糖凝胶电泳30min,回收PCR扩增产物。将PCR扩增产物经过同源重组连接至NcoⅠ单酶切的pCambia2300-CaMV35s::eGFP亚细胞定位载体上,然后转化大肠杆菌感受态细胞Fast-T1(南京诺唯赞公司)过夜培养,挑取单克隆进行菌液PCR鉴定,将阳性克隆子进行测序,获重组载体(CaMV35S::GhTPPA2-eGFP),其中GhTPPA2基因的核苷酸序列如SEQ ID NO.1所示。将亚细胞定位重组载体电击转化农杆菌感受态细胞GV3101(购于北京博迈德公司),注射本氏烟草叶片,48-72h后,在激光共聚焦显微镜下观察叶片组织侵染部位,在650nm激发波长下,叶绿体呈现自发红色荧光;在488nm激发波长下,能够检测到eGFP的绿色荧光信号。
结果(见图1)在亚细胞定位空载体对照组(35S::GFP)中,能够观察到eGFP的绿色荧光信号分布在细胞核,细胞膜和细胞质各处;而在目的基因重组载体实验组(35S::GhTPPA2-eGFP)中,能够观察到融合蛋白的绿色荧光被定位在烟草表皮细胞的叶绿体中,绿色和红色荧光亮点在叶绿体中重叠为黄色,因而可以确定GhTPPA2蛋白亚细胞定位于叶绿体中。
实施例2 GhTPPA2基因超表达载体的构建
(1)超表达载体的构建
将GhTPPA2的CDS序列与REP红色荧光标签融合表达,中间连接一段T2A自剪切多肽序列。具体方法为:以实施例1中克隆了GhTPPA2基因的重组载体为模板,设计去终止子的扩增引物(反向引物去除3’端3个碱基序列)与RFP红色荧光标签(见SEQ ID NO.7)使用重叠延伸PCR方法扩增,引物设计中间连接一段T2A自剪切多肽序列(见SEQ ID NO.8),引物由北京擎科生物科技有限公司合成。并将融合基因通过无缝克隆连接到pCambia2300-CaMV35S(载体抗性为卡那霉素,KpnⅠ/SalⅠ双酶切位点)载体使用DNA无缝克隆试剂盒(HDCloning Kit,购自Takara),50℃连接反应15min,所得连接产物转化感受态细胞E.coliHST08 Premium Competent Cells(Takara),挑取克隆子,经过菌液PCR鉴定阳性,送至北京擎科生物公司进行测序验证。验证正确的克隆子扩大培养后提取质粒,获得超表达质粒载体,命名为:pCambia2300-CaMV35S::GhTPPA2-T2A-RFP。
(2)利用重组载体转化农杆菌
用电击转化法将构建的pCambia2300-CaMV35S::GhTPPA2-T2A-RFP超表达质粒载体转化农杆菌菌株GV3101,挑取单菌落进行PCR鉴定(设计的引物JDTPP-F位于GhTPPA2基因上,引物JDRED-R位于RFP序列上);所述的鉴定引物为:
JDTPP-F:5’-CGCACATGGATGGCTAAGTAT-3’(SEQ ID NO.9);
JDRED-R:5’-ATGAACTCGGTGATGACGTTC-3’(SEQ ID NO.10)。
结果所得PCR扩增产物大小为968bp。将鉴定正确的阳性克隆子在含有100mg/L卡那霉素和50mg/L利福平的LB液体培养基中扩大培养,并加入终浓度30%甘油,于-80℃保存。
实施例3含有GhTPPA2-T2A-RFP融合基因超表达载体的遗传转化试验
按照如下方法进行:
(一)农杆菌介导的烟草遗传转化
(1)烟草叶盘预培养:在超净工作台中,将无菌种植的NC89烟草苗培养至4-6周龄,选取厚实的较大叶片为取材部位,用无菌手术刀切除叶尖和叶基部,避开主叶脉切成0.5-1cm2见方的小块,置于预培养固体培养基中,边缘压实,26℃黑暗条件下培养2天,得烟草叶盘。
(2)农杆菌扩大培养:实施例2中所得的含有GhTPPA2-T2A-RFP融合基因的农杆菌菌液50μL,加入50mL LB液体培养基(100mg/L kan+50mg/LRif)于灭菌的三角瓶内,在28℃、200rpm摇床中过夜培养至OD600接近0.8左右。
(3)菌液富集重悬:将步骤(2)中培养好的农杆菌菌液在常温、5000rpm条件下离心10min,弃上清,收集菌体,用MMA稀释培养基重悬稀释至OD600接近0.4左右。
(4)侵染烟草叶盘和共培养:将步骤(1)中预培养的烟草叶盘取出并将叶盘完全浸入步骤(3)的重悬菌液中侵染30min,取出,用灭菌滤纸吸干叶盘上残留菌液,然后摆放在共培养固体培养基上,在叶盘上下均覆盖一张无菌滤纸,滤纸边缘压实;用封口膜将平板密封好,于28℃、黑暗培养箱中共培养3天。
(5)选择培养:将步骤(4)中共培养所得的外植体转移到选择培养基上,叶盘边缘压入培养基中。在26℃、光暗周期16h L/8h D条件下培养2-3周,每周更换到新的选择培养基中。
(6)生根培养:叶盘边缘愈伤组织逐渐分化出再生幼芽,待再生芽长到约3cm左右,用镊子可以轻松取下边缘的再生幼芽,插入诱导生根培养基中生根培养2-3周。
(7)炼苗、移栽:再生苗长出不定根,将培养瓶封口膜打开,使幼苗适应外界湿度,2天后将再生苗从培养瓶中取出,用水冲去根部附着的残留培养基,将根部浸没于自来水中,室温25℃自然光下培养炼苗5天。按照1:2比例混合栽培土和蛭石并用水润透,经过1周炼苗的抗性再生苗移栽入育苗盘中盖上透明罩保湿,一周内不再浇水使根部自然向下生长。待幼苗完全成活生长到10cm以上,将幼苗移入大盆自然生长。结果共获得12株再生幼苗。
本实施例中所使用培养基的配方
农杆菌菌液扩大培养:50ml LB(高压灭菌)液体培养基,500μL MES(10mM),20μLAS(40μM);重悬培养基MMA配制(100mL)10mM MgCl2·6H2O100mL,MES(10mM)母液1mL,AS(0.1mM)母液200μL;MgCl2·6H2O母液:203.30g/mol 200mL—0.4066g,高压灭菌121℃,20min;AS母液(乙酰丁香酮):0.1M溶于DMSO,0.1μm滤膜过滤除菌;MES母液:1M(pH 5.6),213.2g/mol 50mL—10.66g;
预培养培养基(1L):4.43g MS519粉末(货号:M519,Phytotechnology)、30g葡萄糖溶于1L蒸馏水,用KOH溶液(1M)调节pH至5.8,加入2.8gphytagel粉末(货号:P8169,Sigma),115℃高压蒸汽灭菌15分钟,待冷却至80℃以下,加入终浓度2mg/L细胞分裂素6-BA和0.5mg/L生长素IAA;
共培养培养基(1L):(1)预培养培养基+终浓度100μM的AS;
选择培养基(1L):(1)预培养培养基+终浓度500mg/L羧苄青霉素(Carbenicillin,Car)+200mg/L Kan;
诱导生根培养基(1L):2.215g MS519粉末、15g蔗糖溶于1L蒸馏水,用KOH溶液(1M)调节pH至6.0,加入2.8g phytagel粉末,115℃高压蒸汽灭菌15分钟,待冷却至80℃以下,加入终浓度0.5mg/L生长素IAA、500mg/L头孢霉素(Cephalosporin,Cep)、200mg/L Kan。
(二)转基因植株鉴定
(1)转基因烟草植株基因组阳性检测
利用植物基因组DNA提取试剂盒(购自北京天根公司)提取上述步骤(一)中所得的转基因烟草叶片的基因组DNA,以正向引物JDTPPA-F(见SEQ ID NO.9)和反向引物JDRED-R(见SEQ ID NO.10)为引物进行PCR扩增,以检测是否相应的GhTPPA2-T2A-RFP融合基因整合进入受体材料基因组。
结果(见图2)在12株再生烟草植株中第1、3、4、5、7、8、9、10、11、12的转基因材料PCR能扩增出对应的条带,阳性植株出现的条带大小为968bp,而野生型没有条带,共得到10株转基因烟草。
(2)转基因烟草植株表达阳性检测
为进行RT-PCR检测相应的表达盒是否能够转录出目的mRNA,并测序验证是否SNP突变。取步骤(1)中所得10株转基因烟草叶片分别提取总RNA并反转录成cDNA。以所得cDNA为底物,以正向引物GhTPPAGFP-F1和反向引物DsRed2为引物进行RT-PCR扩增过表达基因全长,其中所述的引物为:
GhTPPAGFP-F1:5’-ATGGACCTGAAATCCAATCACAC-3’(SEQ ID NO.11);
DsRed2-R:5’-CTACAGGAACAGGTGGTGGC-3’(SEQ ID NO.12)。
结果(见图3)从上述(1)中所得的10株GhTPPA2转基因烟草植株中,仅获得4株阳性表达的转基因植株。
收取阳性表达植株的T1代种子,30%次氯酸钠溶液杀菌10min,期间不断摇动,无菌水漂洗5次,将种子铺设于无菌1/2MS抗性培养基(100mg/L)表面。暗处放置2天,转移至光照培养箱(光照强度为3000Lux,27℃,16h光照/8h黑暗)中培养一周后,将长出5-6片真叶的T1代阳性幼苗移植入盆,少量取叶片组织经过基因组PCR扩增和RT-PCR扩增皆得到1887bp全长片段,说明获得了稳定遗传的转基因植株。
(3)转基因植株表达量检测
取上述T1代转基因烟草主茎倒一叶提取总RNA并反转录成cDNA。使用BIO-RAD的实时PCR检测系统检测外源GhTPPA2基因的相对表达水平,
qGhTPPA-F:5’-GGCATCCACTCTGCTTTGAT-3’(SEQ ID NO.13),
qGhTPPA-R:5’-GAGGGGTACTTGAGCATCCA-3’(SEQ ID NO.14)。
按照通用型高灵敏度染料法定量PCR检测试剂盒(南京诺唯赞公司)说明书将cDNA模板、基因特异引物和qPCR Mix混合,每个基因表达都用肌动蛋白基因NtActin标准化,
qNtactin-F:5’-GGATGCATATGTTGGTGACG-3’(SEQ ID NO.15),
qNtactin-R:5’-TTTGGATTCAAGGGTGCTTC-3’(SEQ ID NO.16)。
执行3个实验重复,3个样本重复。荧光定量PCR反应程序:预变性95℃3分钟;然后是40个循环反应,95℃5秒,60℃10秒;最后在熔化曲线采集阶段是95℃15秒,60℃1分钟,97℃15秒。
结果(见图4)4个超表达株系高水平表达外源GhTPPA2基因,其中TPPAOE-4表达水平最高,其次为TPPAOE-2,而野生型材料没有任何表达。说明TPPAOE-4高水平表达了外源GhTPPA2基因。
实施例4GhTPPA2基因超表达株系叶片可溶性糖含量测定试验
将实施例3中所得转基因材料TPPAOE-4及相应的野生型材料NC89种植于中国农科院生物技术研究所温室,每个株系各种植10株,待植株长至15片真叶时,分别选取向光侧同一部位叶片,每个株系5个重复,样品取完于冰上保存,然后称取约0.1g样品放置于烘箱100℃约20min杀青,接着在75℃烘箱中过夜烘干至恒重,常温研磨粉碎,12000rpm离心2min富集于管底。加入蒸馏水1mL振荡5min匀浆,沸水浴10min(盖紧,防止飞溅和蒸发),冷却后,常温、10000g下离心10min,取上清液100μL置于试管中,加入ddH2O 900μL稀释10倍;酶标仪预热,调节波长于620nm,ddH2O调零;水浴锅调节至95℃;标准品配置:10mg无水葡萄糖溶解于1mL蒸馏水配置成10mg/mL母液,将标准母液用蒸馏水稀释至0.0125、0.025、0.05、0.1、0.2、0.3mg/mL浓度梯度。
冷水浴中按照如下所示加样,充分混匀,95℃水浴10min(在1.5mL EP管中进行,盖紧防止水分蒸发)。空白管:ddH2O 80μL,0.2%蒽酮试剂(浓硫酸配置)220μL;标准管:标准溶液(6个)40μL,ddH2O 40μL,蒽酮试剂220μL;测定管:样品溶液40μL,ddH2O 40μL,蒽酮试剂220μL。
自然冷却至室温后,吸取200μL转移至96孔酶标板,于620nm处测定吸光值,分别记为A空白、A标准、A测定,ΔA标准=A标准-A空白,ΔA测定=A测定-A空白;建立标准曲线:以浓度(x)为横坐标,吸光值ΔA标准(y)为纵坐标建立标准曲线。根据y=k*x+b线性回归方程,将ΔA测定代入公式计算样本浓度x(mg/mL);可溶性糖含量计算:可溶性糖(mg/g)=10*x÷W,W样本质量(g)。数据结果使用EXCEL软件进行统计分析和差异显著性检测。
结果(见图5)GhTPPA2基因超表达株系TPPAOE-4叶片的可溶性总糖含量为12.84±1.28mg/g,而野生型材料的可溶性总糖含量为9.18±1.33mg/g,即转基因株系叶片的可溶性总糖含量显著高于野生型材料,说明GhTPPA2基因超表达显著促进了植株叶片可溶性糖的积累。
实施例5超表达GhTPPA2基因株系叶片的淀粉含量测定试验
按照如下方法进行:
用酸水解-硫酸蒽酮显色定量法测定淀粉含量。向实施例4中可溶性糖提取后的沉淀中加入80%乙醇漂洗两次,室温开盖放置5分钟使乙醇挥发,向沉淀中加入300μL双蒸水,振荡混匀后放入沸水浴15min;冷却后,加入1%高氯酸600μL,常温水解15min,期间振荡3~5次;冷却后,在8000g、常温条件下离心15min;吸取50μL上清液加双蒸水稀释至1000μL,稀释20倍;标准样品配置:无水葡萄糖10mg溶解至1mL双蒸水中配制成10mg/mL葡萄糖标准液。将标准母液进行稀释,得到0.01、0.02、0.03、0.04、0.05、0.1、0.2、0.4mg/mL标准溶液,设置为标准曲线的的8个标准点;酶标仪预热,调节波长于620nm处,双蒸水调零。
冷水浴中按照如下所示加样,充分混匀,95℃水浴10min(在1.5mL EP管中进行,盖紧防止水分蒸发)。空白管:ddH2O 50μL,0.2%蒽酮试剂(用浓硫酸配置)250μL;标准管:50μL标准溶液(8个),0.2%蒽酮试剂250μL;测定管:样品溶液(已稀释)50μL,0.2%蒽酮试剂250μL。
自然冷却,吸取200μL于96孔酶标板中,在620nm波长下测量吸光度值。绘制标准曲线。按照样本质量计算:淀粉含量(mg/g)=0.81*x÷W*F,W为样本质量(g),F为样品稀释倍数(20)。数据结果使用EXCEL软件进行统计分析和差异显著性检测。
结果(见图6)GhTPPA2基因超表达株系TPPAOE-4叶片的淀粉含量为28.90±1.85mg/g,而野生型材料NC89叶片的淀粉含量仅为22.6±1.17mg/g,即GhTPPA2转基因株系叶片的淀粉含量显著高于野生型材料。说明本发明超表达GhTPPA2基因促进了植株叶片中淀粉含量的积累。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来讲,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (5)
1.超表达核苷酸序列如SEQ ID NO.1所示的GhTPPA2基因或氨基酸序列如SEQ ID NO.2所示的GhTPPA2蛋白在促进植物叶片中淀粉积累上的应用;其中所述的植物是指棉花或烟草。
2.超表达核苷酸序列如SEQ ID NO.1所示的GhTPPA2基因或氨基酸序列如SEQ ID NO.2所示的GhTPPA2蛋白在培育叶片中淀粉含量高的植物上的应用;其中所述的植物是指棉花或烟草。
3.含有核苷酸序列如SEQ ID NO.1所示的GhTPPA2基因的超表达载体在促进植物叶片中淀粉积累上的应用;其中所述的植物是指棉花或烟草。
4.根据权利要求3所述的应用,其特征在于,所述的超表达载体是指pCambia2300、pCambia2301、pBI121、pCAMBIA1300或pCAMBIA1301。
5.含有超表达核苷酸序列如SEQ ID NO.1所示的GhTPPA2基因的农杆菌在促进植物叶片中淀粉积累的应用;其中所述的植物是指棉花或烟草。
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