Precocity upland cotton new-germplasm breeding method

Abstract

The invention belongs to the field of cotton genetic breeding, and relates to a precocity short-fruit-spur upland cotton new-germplasm breeding method. The method includes the steps that hybridization and backcrossing are carried out with simian 2 as a female parent and gossypium klotzschianum as a male parent to obtain F1 plants and BC1F1 plants capable of normally growing; multi-generation backcrossing is carried out through simian 2 continuously, then backcross descendants are separated through selfing, zero type fruit spur families and first type fruit spur families good in prematurity and yielding ability are selected in separated groups, and precocity cotton new germplasm with the growth period of about 105 days, the zero-type or first-type fruit spurs, the compact plant type, concentrated boll opening, the good boll-setting performance, the high ginning outturn and the good fiber quality is bred through continuous multi-generation selfing and field orientation optimization in cooperation with an indoor plant laboratory test. The precocity source comes from the gossypium klotzschianum, and the hereditary basis of precocity breeding is expanded; precocity genes in the gossypium klotzschianum can be used by breeding and are of great significance in science and production.

Description

technical field [0001] The invention belongs to the category of cotton genetics and breeding, and relates to a method for breeding new germplasm of early-maturing upland cotton with short fruiting branches, which is suitable for breeding new germplasm of early-maturing upland cotton after direct-seeding or transplanting after wheat oiling in Jiangsu. Background technique [0002] The cotton area in the Yangtze River Basin has always been dominated by the cultivation of medium-maturity cotton. The production cycle is long, especially the flowering period is long, and the maturity is inconsistent. It can only be harvested manually, which requires a large amount of labor. The transfer of rural areas to cities has caused a sharp decrease in the number of rural labor forces, posing a huge threat to cotton production; at the same time, with the development of society, especially in economically developed coastal areas, the contradiction between grain and cotton land has become incr...

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Problems solved by technology

[0003] However, there are many difficulties in the breeding of such multi-target traits. Firstly, there is a lack of germplasm resources with these traits; secondly, most of the existing early-maturing cotton varieties come from the early-maturing source of cotton, which has a narrow genetic basis; and early-maturing and yield, The negative correlation between qualities intensifies the difficulty of breeding

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