Perennial cultivation method for annual cotton

Abstract

The invention relates to a perennial cultivation method for annual cotton. The method comprises the following steps: firstly evaluating the natural wintering capability of the annual cotton; regarding the annual cotton incapable of wintering naturally, taking the gossypium perennial cotton seed resources or other hybrid species capable of wintering naturally as a parent stock for grafting, and obtaining the grafting plant through perennial root cultivation; and regarding the annual cotton capable of wintering naturally, directly planting the annual cotton and carrying out the perennial root cultivation of the original plant, or carrying out the grafting according to the method and then cultivating the grafting plan. The method realizes the perennial cultivation of the annual cotton, thereby enlarging the cultivation area of the cotton from the tropical zone to the southern subtropical zone. The grafted plant can grow with the perennial root for a long period till the variety is updated. The method is used for the hybrid cotton and can hold the heterosis and also greatly improve the yield due to the prolonged growth duration of the cotton. The method is used for cotton hybridization and seed preparation. As the nucleus male sterile line can adopt grafting vegetative propagation without a maintainer line, the method not only simplifies the seed preparation process, but also greatly can improve the seed preparation yield.

Description

technical field [0001] The invention belongs to the field of crop cultivation, and in particular relates to a perennial cultivation method for annual cotton. Background technique [0002] The main cultivated species of cotton are Gossypium hirsutum L. and G. barbadence L. . Upland cotton is an annual plant, and sea-island cotton has two types: annual and perennial, but annual sea-island cotton is still cultivated on a large scale. [0003] The hybrid vigor of cotton is very significant, but the hybrid vigor cannot be fixed, and farmers need to purchase hybrid seeds every year, which increases production costs. Moreover, the production of cotton hybrid seeds is difficult and costly. The reason is that although the nuclear male sterile line is easy to find the restorer line and form a strong dominant combination, its male sterility is difficult to maintain, and the hybrid seed field must be pulled out. About 50% of the male-fertile plants in the female parent area are concen...

AI Technical Summary

Problems solved by technology

But this inventive method has the following problems: one, according to one of the characteristics described in the patent, the area where the cotton plant can survive the winter is the area with the lowest winter temperature greater than 10°C, and the area that meets this temperature condition should belong to the mid-tropical area ( Edited by Sheng Chengyu et al., General Introduction to China's Climate, Science Press, 1986, p. 406), that is, southern Hainan Island and southern Yunnan, etc.

However, there are many typhoons in tropical areas in summer, which is unfavorable for cotton cultivation; secondly, this invention does not solve the breeding problem of sterile lines, but only utilizes the characteristics that sterile lines can grow for many years in tropical areas, and realizes the perennial cultivation of annual cotton in tropical areas , the hybrid seed production still had the problem of pulling out the fertile plants in the female parent area of ​​the planting field; third, because the root system of annual cotton is shallow in the soil and prone to premature aging, even under the most suitable temperature conditions for growth, it can only be cultivated for 3-5 years. years, have to replant