Biotechnology Bulletin ›› 2024, Vol. 40 ›› Issue (3): 146-154.doi: 10.13560/j.cnki.biotech.bull.1985.2023-0746

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Association Analysis and Exploration of Elite Alleles of Plant Architecture Traits in Gossypium hirsutum L.

WANG Juan(), WANG Xin, TIAN Qin, MA Xiao-mei, ZHOU Xiao-feng, LI Bao-cheng, DONG Cheng-guang()   

  1. Cotton Research Institute, Xinjiang Academy of Agricultural and Reclamation Science, Shihezi 832000
  • Received:2023-08-09 Online:2024-03-26 Published:2024-04-08
  • Contact: DONG Cheng-guang E-mail:cottonwj@126.com;dcg318@163.com

Abstract:

【Objective】 Plant architecture is a key factor affecting the mechanization and yield of cotton. The association analysis of plant architecture traits in upland cotton can provide elite marker sources and excellent germplasm materials for molecular breeding of cotton plant architecture. 【Method】 In this study, taking 403 upland cotton germplasms as materials, an association analysis of four plant architecture traits in six environments was implemented using 201 pairs of polymorphic SSR markers covering the whole genome, and the elite alleles were identified. 【Result】 The average coefficients of variation of the plant height, height of first fruit branch node, the first fruit branch node and fruit branch number were 13.70%, 21.51%, 14.18% and 11.51%, respectively, and the range of broad-sense heritability was 46.24%-74.15%. A total of 394 allelic variation loci were generated from 201 markers. A total of 38 loci were repeatedly detected in best linear unbiased prediction(BLUP)(P < 0.01)and more than two environments at a significant level(P< 0.05). Of 38 loci, 16 were associated with plant height, six were associated with height of first fruit branch node, 11 were associated with the first fruit branch node, and five were associated with fruit branch number. In addition, five loci were associated with multiple traits simultaneously. Thirty one materials containing elite alleles of target traits were identified, and six of them carried multiple elite alleles concurrently. 【Conclusion】 Thirty-eight marker loci associated with four plant architecture traits were identified in 403 natural populations, and 31 typical materials containing excellent alleles were identified.

Key words: upland cotton, plant architecture traits, association analysis, elite alleles