LU506123B1

LU506123B1 - Method for grafting tender branches of Chimonanthus praecox

Info

Publication number: LU506123B1
Application number: LU506123A
Authority: LU
Inventors: Jianming Cheng; Sheng Luo; Zhigang Wang; Zhiguo Shen; Xin Ding; Xihui Shen; Fangfang Wu; Shengli Lv; Meng Sun
Original assignee: Henan Acad Of Forestry; Henan Colorful Horticulture Co Ltd
Priority date: 2024-01-15
Filing date: 2024-01-15
Publication date: 2024-07-16

Abstract

The invention provides a method for grafting tender branches of Chimonanthus praecox, including following steps: selecting Chimonanthus praecox to be improved as a rootstock in June-August in summer, and selecting semi-lignified branches of excellent Chimonanthus praecox varieties as scions; when grafting, cutting the scion into 8-14 cm of stem segments, and cutting the annual or current-year-old branches on the scion and the rootstock into sections with same size of 5-10 cm in length and 0.5 cm in width respectively, and evenly cutting off the phloem when cutting sections, slightly exposing the xylem, and aligning and adhering the phloem of the two sections, wrapped tightly with plastic sheets from bottom to top. When scions are at the top branch, the top branch of 3-4 cm is left above the scion section; when scions are at the middle stem segment, 1-2 pairs/piece buds are exposed at the top of the scion.

Description

DESCRIPTION LU506123

METHOD FOR GRAFTING TENDER BRANCHES OF CHIMONANTHUS

PRAECOX

TECHNICAL FIELD

The invention relates to that field of forest propagation, and in particular to a method for grafting tender branches of Chimonanthus praecox.

BACKGROUND

The common propagation methods of Chimonanthus praecox are grafting propagation and division propagation. Division propagation means that a mother tree can only separate 2-3 ramets, which takes two to three years to complete the process, with long propagation cycle and low propagation coefficient. Grafting propagation is divided into branch grafting and bud grafting. In the production practice of Chimonanthus praecox, branch grafting is more common.

In the traditional branch grafting, the grafting is in spring, the rootstock is annual or perennial seedlings of Chimonanthus praecox, and the scion is annual completely lignified hard branches of Chimonanthus praecox, and the grafting methods are mostly cleft grafting and cut grafting. The grafting time of hard branches can only be around

March in spring, only about one month, so it is difficult to survive too early or too late, and the grafting time is strict.

The cleft grafting means grafting by vertically cutting the union in the center of the rootstock section. The cut grafting refers to cutting off the rootstock and the smooth bark near the ground, and cutting 3-5 cm of it under one side of the rootstock section. Then, the scion with 1-2 full buds is inserted into the rootstock, aligned with the cambium of both sides, tightly bound and buried in the soil for moisture preservation, and the scion is exposed with 1-2 buds. For Chimonanthus praecox, the traditional grafting methods such as cleft grafting and cut grafting have a high survival rate, but they often have POR 506123 healing, which may easily cause the grafting site of the rootstock to dry up and die or cause the seedlings to die due to the wind folding, and the survival rate of seedlings is low.

SUMMARY

The invention aims to provide a method for grafting tender branches of

Chimonanthus praecox, so as to improve the survival rate and preservation rate of

Chimonanthus praecox grafting.

In order to solve the above technical problems, the method for grafting tender branches of Chimonanthus praecox provided by the invention is realized as follows: a method for grafting tender branches of Chimonanthus praecox includes the following steps: selecting Chimonanthus praecox to be improved as a rootstock in summer, and selecting semi-lignified branches of excellent Chimonanthus praecox varieties as scions; cutting the annual or current-year-old branches on the scion and the rootstock into sections with the same size of 5-10 cm in length and 0.5 cm in width respectively, and the section is a plane, the plane has no included angle with the scion and the rootstock, and the phloem is cut and the xylem is slightly exposed when the section is cut; aligning the section phloem on the scion with the section phloem on the rootstock, adhering tightly, and wrapping tightly with a plastic cloth from bottom to top; after the grafted seedling survives, the part above the graft union on the rootstock is cut off, and the graft union is completely healed and then unbound.

Optionally, when the scion is the top branch of the branch, the top branch of 3-4 cm is left above the scion section.

When the scion is at the middle stem segment, one side of the middle stem segment is cut off into sections, and 1-2 buds are left at the top or upper part of the middle stem segment.

Optionally, the scion is the branch stem segment with a length of 8-14 cm.

Optionally, when the scion section and the rootstock section are not capable of adhering tightly, the phloem on one side is ensured to be aligned and adhered.

In the method for grafting tender branches of Chimonanthus praecox provided bY 506123 the invention, semi-lignified branches are used as scions, so that the grafting time is long; the contact area of scion incision and rootstock incision is large, and the nutrient transportation in roots and leaves is smoother, which is beneficial to the survival of grafting and the grafted seedlings grow vigorously. The healing surface between the scion incision and the rootstock incision is large, and the grafted plants have great wind resistance, which improves the survival rate of grafted plants. Moreover, the semi-lignified branches produced by short pruning in summer are fully utilized, saving resources. It is beneficial to the survival of grafting to cut off the part above the graft union after grafting survival.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is a diagram of grafting when a scion is at the top of a branch;

Fig. 2 is a grafting diagram when the scion is at the middle stem segment;

Fig. 3 is a diagram of graft healing; wherein: 1- scion and 2- rootstock.

DESCRIPTION OF THE INVENTION

In order to make the objective, technical scheme and advantages of the present invention clearer, the following embodiments will further explain the present invention in detail. It should be understood that the specific embodiments described here are only used to explain the invention, and are not used to limit the invention.

The experiment site of the method for grafting tender branches of Chimonanthus praecox is Yanling County, Xuchang City, Henan Province, and the average temperature in summer is 20°C-32°C in June, 23°C-32°C in July and August. The planting area of the invention was 0.5 mu(1 mu=666.67m°), and 500 grafted plants were grafted in June respectively. The method for grafting the tender branch of Chimonanthus praecox in the invention limits the season to clearly show the growth environment of Chimonanthus praecox, but the climate environment which is the same as the limited season is still within the protection scope of the invention.

Tree varieties with the same or similar physiological characteristics gs 01%

Chimonanthus praecox can also use the method of the invention, which are all within the protection scope of the invention.

The method for grafting tender branches of Chimonanthus praecox provided by the invention comprises the following steps: Step 1, selecting rootstocks

Two-year-old seedlings of Chimonanthus praecox were selected as the rootstock, and the thickness of rootstock was 1-1.2 cm. The rootstock is a variety to be improved, and the Chimonanthus praecox variety of the rootstock in the embodiment of the invention is Var.intermedius.

Step 2, selecting a scion

The scion is selected from the excellent varieties, and the semi-lignified branches on

Chimonanthus praecox 'Hongyun' were selected as the scion in the embodiment of the invention. According to the experiment site of the invention, the grafting time can be the summer time from June to August. In this embodiment, the grafting time is June 5th in summer, and 500 plants were grafted. Before grafting, semi-lignified branches with full buds and healthy growth were selected as scions at the periphery of the crown of

Chimonanthus praecox 'Hongyun', the thickness of the scion was about 0.5 cm. The top branch or the middle stem segment can be selected as scions, and the length of the scion is 8-14 cm. Before grafting, the leaves were cut off on the scion to keep the petioles. It should be noted that the scion requires semi-lignification, and there is no requirement on the age of the trees providing the scions. In the embodiment of the invention, the scion provided by the 3-4 year-old Chimonanthus praecox 'Hongyun' was selected.

Step 1 and Step 2 are in no particular order.

Step 3, grafting

The annual or annual branches on the scions and the rootstocks were cut into sections with the same size respectively, and when cutting the sections, holding scissor, the phloem was cut along the scion or the rootstock from top to bottom to slightly expose the xylem.

The section is in the following state: the xylem is exposed at or near the middle Pat 506123 of the section, and a part of phloem is cut off at the upper, lower, left and right sides of the section, with a length of 5-10 cm and a width of 0.5 cm; the section is a plane, and there is no included angle between the plane and the scion and the rootstock. When the scion is at the top branch, the top branch of 3-4 cm is left above the scion section; when the scion is at the middle stem segment, one side of the stem segment should be cut as completely as possible, and 1-2 pairs/piece buds should be reserved at the top or upper part of the stem segment; Then, the phloem of the two sections are aligned and tightly adhered, and wrapped with plastic cloth from bottom to top to ensure that the rootstock and scion do not lose water; when the incisions on the rootstock and scion cannot be completely close to each other, it is necessary to ensure that the phloem on one side of the two incisions on the rootstock and scion is close to each other.

When the scion was at the top branch, the top was exposed 3-4cm, as shown in Fig. 1. When the scion was at the middle stem segment, the scion with 1-2 or 1-2 pairs of buds were exposed on the upper part, as shown in Figure 2, which was a new branch from 1-2 or 1-2 pairs of buds. After the grafting survives, the part will be cut off above the graft union on the rootstock, as shown in Fig. 1 and Fig. 2, the grafting was survived and the part above the graft union on the rootstock was cut off. After the graft union is completely healed for more than 3 months, that is, the scion and the rootstock grow together completely, unbinding is performed. Fig. 3 is the grafting diagram after unbinding. After unbinding, the sprouts on the rootstock should be wiped off in time, and the newly sprouted buds at the base of the rootstock should be removed in time.

Moreover, the conventional field, soil, fertilizer and water management, pest control may be done.

It should be noted that the embodiment of the present invention does not sterilize the sections of scions and rootstocks before the grafting starts, which is to save time and labor on one hand, and improper poison treatment is easy to cause damage to shoots and reduces the grafting survival rate on the other hand.

In the embodiment of the invention, about 20 days after grafting, the survival raté 506123 was determined to be more than 98%, 500 plants were grafted, and 495 plants were germinated and survived. 5 months after the grafting, in November of the current year, 490 grafted plants of Chimonanthus praecox survived and were preserved.

In the same year, the lignified branches were grafted in the same site in March of spring, and the grafting methods were split grafting and cut grafting, each 200 plants respectively. Other field management measures such as fertilization, watering and bud smearing were the same, and a control experiment was carried out. After 20 days of grafting, it was investigated that 163 plants survived by split grafting and 159 plants survived by cut grafting, and the survival rates of split grafting and cut grafting were lower than those of the grafting method of the present invention. After 5 months of grafting, in November of the current year, survived and preserved Chimonanthus praecox grafted plants,with the number of split grafting 150 and cut grafting 150, and the survival rates of split grafting and cut grafting were lower than those of the grafted

Chimonanthus praecox grafted by the grafting method of the present invention.

Meanwhile, semi-lignified branches were grafted in summer, but the section of cut grafting was selected, and the angle of the section was between 30 and 60°. Specifically, the method for grafting tender branches of Chimonanthus praecox recorded in patent with the application number 2019102980948 was used. 200 plants were grafted, and 197 plants survived the scion germination. After 5 months of grafting, in November of the current year, there were 179 grafted plants of Chimonanthus praecox survived and preserved. Although the survival rate of the method for grafting tender branches of

Chimonanthus praecox described in patent application with application number 2019102980948 is not much different from that of the present invention, the preservation rate is obviously lower than that of the method for grafting tender branches of

Chimonanthus praecox in the present invention.

The method can be use for improving the variety of high scion and head-changing in summer, makes full use of the semi-lignified branch generated by short pruning in summer, has large healing surfaces of rootstocks and scions and strong anti-wind ability, thus greatly improving the grafting survival rate and preservation rate of Chimonanthus praecox.

The above is only the preferred embodiment of the invention, and it is not used {506123 limit the invention.

Any modification, equivalent substitution and improvement made within the spirit and principle of the invention should be included in the protection scope of the invention.

Claims

CLAIMS LU506123

1. A method for grafting tender branches of Chimonanthus praecox, characterized by comprising the following steps: selecting Chimonanthus praecox to be improved as a rootstock in summer, and selecting semi-lignified branches of excellent Chimonanthus praecox varieties as scions; cutting the annual or current-year-old branches on the scion and the rootstock into sections with the same size of 5-10 cm in length and 0.5 cm in width respectively, and the section is a plane, the plane has no included angle with the scion and the rootstock, and the phloem is cut and the xylem is slightly exposed when the section is cut; aligning the section phloem on the scion with the section phloem on the rootstock, adhering tightly, and wrapping tightly with a plastic cloth from bottom to top; after the grafted seedling survives, the part above the graft union on the rootstock is cut off, and the graft union is completely healed for 3 months and then unbound.

2. The method for grafting tender branches of Chimonanthus praecox according to claim 1, characterized in that when the scion is at the top branch, the top branch of 3-4 cm is left above the scion section.

3. The method for grafting tender branches of Chimonanthus praecox as claimed in claim 1, characterized in that when the scion is at the middle stem segment, one side of the middle stem segment is cut off into sections, and 1-2 buds are left at the top or upper part of the middle stem segment.

4. The method for grafting tender branches of Chimonanthus praecox according to any one of claims 1-3, characterized in that the scion is the branch stem segment with a length of 8-14 cm.

5. The method for grafting tender branches of Chimonanthus praecox according to claim 4, characterized in that when the scion section and the rootstock section are not capable of adhering tightly, the phloem on one side is ensured to be aligned and adhered.