Early-maturing high-ginning-outturn cotton line breeding method

Abstract

The invention discloses an early-maturing high-ginning-outturn cotton line breeding method which comprises the steps: A, utilizing early-maturing gene resources to breed an early-maturing novel material in a growth period: performing middle 5168 parent selection of an early-maturing variety; B, increasing spacetime selection pressure and breeding a very early-maturing cotton novel material with high pre-frost yield, high yield and stable yield; 1) increasing time selection pressure; 2) increasing space selection pressure; C, a breeding method in which low-generation mixed selection, high-generation single selection and Hainan island progeny planting are combined: 1) performing low-generation mixed selection; 2) performing high-generation single selection; D, a molecular marker screening method of middle 5168: utilizing identified SSR markers of HAU3318, MGHES-73 and NAU3913 related to early-maturing characters to distinguish the middle 5168 from short season cotton varieties like middle 425, China cotton research institute 16, China cotton research institute 36 and China cotton research institute 74 and spring cotton varieties like deltapine cotton 15, Shandong research center 28,China cotton research institute 12, China cotton research institute 41, China cotton research institute 45 and Shandong cotton research center 1. The method has the advantages of easiness, practicability, convenience in operation, quick selection speed and high selection efficiency; the selected novel variety has the characteristics of early maturity and high ginning outturn.

Description

technical field [0001] The invention belongs to the technical field of cotton seed selection, and more specifically relates to a breeding method for early-maturing and high-yield cotton strains. Background technique [0002] The Chinese people have a lot of land, and ensuring food security is the top priority of the national economy and people's livelihood. Early-maturing cotton (also known as short-season cotton, Short season cotton) plays a very important role in solving the contradiction between the abundance of land and the shortage of land in China, the competition for land for grain and cotton, and the optimization of agricultural structure. Cultivating early-maturing, high-yield, high-quality, and stress-resistant new varieties of short-season cotton, improving its production system, and improving the comprehensive benefits of grain and cotton production are of great practical and long-term significance to the safety of China's grain and cotton industries. [0003] S...

AI Technical Summary

Problems solved by technology

[0008] A. Using extra-early-maturing genetic resources to cultivate early-maturing new materials with a growth period of 95-110 days: In order to achieve the breeding goal, the existing early-maturing varieties cannot meet the needs of the double-cropping system or the growth of extra-early-maturing and early-maturing cotton areas in northern Xinjiang, resulting in Reduced flowering rate before frost, decreased yield and quality, etc., based on the applicant's self-cultivated excellent germplasm: SGK Zhong 27 (Zhongmian Institute 27), through the introduction of extra early maturing germplasm materials 92-047, Zhong 502181, Zhong 603 and Jinmian 37 and other extra-early-maturing genes were aggregated through multi-parental compound crosses to cultivate a new extra-early-maturing material Zhong 5168 with a growth period of 100 days.

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