An analysis of genetic diversity and linked agronomic traits of Heshangtou wheat in northwest China

doi:10.11686/cyxb2018124

Abstract

Abstract: Key aims of this study were: 1) to better understand the genetic structure of the Heshangtou wheat landrace from northwestern China, and 2) to explore the link between genetic markers and agronomic traits. A collection of 43 germplasm lines from different regions in northwest China was genetically characterized using 150 simple sequence repeat (SSR) marker loci, which were evenly distributed across the 21 chromosomes of wheat. Concurrently, 19 agronomic traits were recorded for the same germplasm lines at two test sites, and a general linear model (GLM) was used to analyze the association between molecular markers and phenotypic traits. A total of 151 allelic variants were detected using 45 pairs of polymorphic SSR markers. The number of alleles in each marker ranged from 2 to 6, with an average of 3.36, and the polymorphic information content (PIC) varied from 0.044 to 0.771. It was found that the genetic diversity among the 19 agronomic traits assessed in this way was significantly higher than that of quality traits. The agronomic traits (except for shell color) exhibited varying degrees of correlation. Population genetic structure analysis classified the 43 germplasm lines into 8 subgroups. Correlation analysis showed that 11 SSR markers were significantly associated with particular agronomic traits, and the extent to which phenotypic variation was explained by single markers ranged from 8.89%-24.74%. Some of the markers identified may be useful for marker-assisted selection in wheat breeding.

Key words: wheat, genetic diversity, molecular markers, association analysis

ZHANG Yan-jun, GOU Zuo-wang, WANG Xing-rong, LI Yue, QI Xu-sheng. An analysis of genetic diversity and linked agronomic traits of Heshangtou wheat in northwest China[J]. Acta Prataculturae Sinica, 2019, 28(2): 142-155.

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