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Chinese Agricultural Science Bulletin ›› 2025, Vol. 41 ›› Issue (27): 11-20.doi: 10.11924/j.issn.1000-6850.casb2025-0324

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Alien-Derived Progeny Populations of Wheat from Qinghai Plateau: Genetic Variation Analysis of Agronomic and Seed Traits

LIU Shufeng1(), SHEN Jicheng2,3, YANG Youlai1, LIU Ruijuan2,3, CHEN Wenjie2,3, LIU Demei2,3()   

  1. 1 Agricultural Extension Center of Huzhu County, Qinghai Province, Haidong, Qinghai 810599
    2 The Key Laboratory of Plateau Biological Adaptation and Evolution, Chinese Academy of Sciences/Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008
    3 The Key Laboratory of Crop Molecular Breeding in Qinghai Province, Northwest Institute of Plateau Biology, Xining 810008
  • Received:2025-04-30 Revised:2025-06-15 Online:2025-09-25 Published:2025-10-07

Abstract:

To improve disease resistance and yield of spring wheat in the Qinghai Plateau, an F4 population was constructed using the elite local cultivar 'Gaoyuan 448' as the female parent and the CIMMYT disease-resistant germplasm 'Mucuy' as the male parent. Systematic analysis of 145 families revealed abundant variation in agronomic traits, with coefficients of variation for plant height, tiller number, spike length, spikelet number per spike, and grain number per spike being 11.67%, 54.09%, 14.74%, 11.58%, and 27.14%, respectively; among grain traits, grain area and perimeter showed variations of 24.54% and 9.39%. Correlation analysis indicated highly significant positive correlations (P<0.01) between grain number per spike and grain size traits (area r=0.55, perimeter r=0.57) as well as spikelet number (r=0.37). Principal component analysis extracted four principal components (cumulative contribution rate 83.117%), with grain morphology indicators contributing 46.824%. Based on comprehensive membership function values, 25 elite lines (comprehensive index >5.0) were selected, combining field evaluation for adult-plant resistance to stripe rust, seven lines were developed that integrate the high-yield spike architecture of 'Gaoyuan 448' (with >16 spikelets per spike and >44 grains per spike) and the disease resistance characteristics of 'Mucuy'. This study provides novel germplasm resources and theoretical support for breeding disease-resistant and high-yielding wheat cultivars in Qinghai.

Key words: Qinghai Plateau wheat, CIMMYT spring wheat, 'Gaoyuan 448', agronomic traits, grain traits, genetic variation, superior line selection, comprehensive trait weighting analysis