Breeding method of new high-quality cotton line with resistance to blight and verticillium wilt

Abstract

The invention discloses a breeding method of a new high-quality cotton line with resistance to blight and verticillium wilt. According to the breeding method, the new cotton line with excellent comprehensive fiber equality and strong diseases resistance is bred by utilizing high-specific-strength and high-quality disease-resistant germplasm materials which are bred by using a large number of variation individual systems generated by interspecies distant hybrid progenies of upland cotton and middle cotton and taking the fiber specific strength as a dominant direction, so that a material basis is provided for breeding the new high-quality disease-resistant cotton line. The fiber specific strength of the obtained line is above 38cN / tex, the diseased plant rate with the blight and the verticillium wilt of plants is obviously reduced, and the resistance to the blight and the verticillium wilt is strong.

Description

technical field [0001] The invention relates to a method for creating a new strain of high-strength, high-quality, disease-resistant cotton by combining distant hybridization and systematic breeding, and belongs to the field of cotton breeding methods. Background technique [0002] From the 1960s to the end of the 1980s, my country's cotton breeding work has always focused on the selection of high-yield traits and disease-resistant traits, while ignoring fiber quality, especially specific strength, resulting in poor quality of self-fertile cotton varieties in my country (Cui Shufang et al., Hebei Agricultural Science and Technology Co., Ltd. Science, Issue 01 of 2005). From the "Sixth Five-Year Plan" to the "Ninth Five-Year Plan" period, the main fiber length or 2.5% span length of my country's self-fertile upland cotton varieties is mainly concentrated in 27-30mm, the specific breaking strength is concentrated in 17-23cN / tex, and the micronaire value is concentrated In the r...

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Problems solved by technology

Compared with foreign countries, my country's cotton breeding production has a higher output level, but the quality of cotton fiber and raw cotton is relatively poor. The outstanding problem of fiber quality in my country's cotton varieties is that the length and type are single, mainly around 29mm; the specific strength is small and the type Single, around 21cN / tex; the micronaire value is also relatively single and thick, mainly between 4.0 and 4.5, which cannot meet the multi-level cotton demand of the textile industry for cotton quality, and is comparable to the multi-level raw cotton demand of the cotton textile industry The difference is relatively large (Cui Xiuzhen, Anhui Agricultural Science, 2006, 34(11): 2360-2361, 2367)

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