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Acta Prataculturae Sinica ›› 2024, Vol. 33 ›› Issue (9): 70-80.DOI: 10.11686/cyxb2023483

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A multivariate analysis of reproduction-related traits of wild Roegneria kamoji in the northern Dabie Mountains under cultivation

He-shan ZHANG1(), Zhi-yong WANG2, Xin-jiang WU1, Hong TIAN1, Jun-bo XIONG1, Jiao-yun LU1, Yang LIU1()   

  1. 1.Key Laboratory of Animal Embryo Engineering and Molecular Breeding of Hubei Province,Institute of Animal Husbandry and Veterinary Medicine,Hubei Academy of Agricultural Sciences,Wuhan 430064,China
    2.Xinyang College of Agriculture and Forestry,Xinyang 464399,China
  • Received:2023-12-13 Revised:2024-01-31 Online:2024-09-20 Published:2024-06-20
  • Contact: Yang LIU

Abstract:

This research studied the genetic variation of reproduction-related traits of 22 different Roegneria kamoji lines collected in the northern Dabie Mountain. Variance, correlation, cluster and principal component analyses of 12 reproduction-related traits were conducted. The results indicated large variations among different R. kamoji populations for the different measured traits, with the largest coefficient of variation being for seed weight per plant (15.97%), followed by awn length (13.98%) and 1000-seed weight (13.46%). The mean value of the genetic diversity index among different populations was 0.799. Correlation analyses showed that altitude was positively correlated with awn length and spikelet length (P<0.05), and longitude was negatively correlated with spikelet length (P<0.05). Latitude was significantly correlated with awn length, spikelet length, and seed weight of a single inflorescence (P<0.05). The 22 R. kamoji lines were classified into three groups by reproduction-related traits; the first group has longer inflorescences and more spikelets, and seeds, but lower thousand-seed weights and seed weight per plant. The second group has greater awn length and spikelet length, longer seeds, greater thousand seed weight, and includes ‘large-seed’ types. The third group has shorter inflorescences, and a lower number of spikelets and seeds per spikelet, but the highest seed weight per plant, and includes potentially high-yielding seed types. Combined with principal component analysis and two-dimensional ranking analysis, the germplasm lines 1, 13 and 15 possesses promising traits such as compact spike shape, large seed size and seed weight per plant, with potentially high seed yield characteristics. These germplasm lines can thus provide foundation plants for breeding new varieties of R. kamoji or can be further studied as excellent germplasm material.

Key words: the northern Dabie Mountian, Roegneria kamoji, reproductive trait variation