Ecological genomics of Chinese wheat improvement: implications in breeding for adaptation

BMC Plant Biology

Weiping Shi¹  Jie Guo¹  Jiahui Guo¹  Shunhe Cheng²  Meixue Zhou³  Junjie Zhao⁴  Chenyang Hao⁴  Chang Li⁴ 

[1] College of Agronomy, Shanxi Agricultural University, 030801, Jinzhong, Shanxi, China;College of Agronomy, Shanxi Agricultural University, 030801, Jinzhong, Shanxi, China;Key Laboratory of Wheat Biology and Genetic Improvement for Middle and Lower Yangtze Valley, Ministry of Agriculture and Rural Affairs, Lixiahe Agricultural Institute of Jiangsu Province, 225007, Yangzhou, Jiangsu, China;College of Agronomy, Shanxi Agricultural University, 030801, Jinzhong, Shanxi, China;Tasmanian Institute of Agriculture, University of Tasmania, Private Bag 1375, 7250, Prospect, TAS, Australia;Key Laboratory of Crop Gene Resources and Germplasm Enhancement, Ministry of Agriculture and Rural Affairs/The National Key Facility for Crop Gene Resources and Genetic Improvement/Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, 100081, Beijing, China;

关键词: Bread wheat;    Agro-ecological zones;    Selection;    KASP marker;   

DOI  :  10.1186/s12870-020-02704-w

来源: Springer

【 摘 要 】

BackgroundChina has diverse wheat varieties that adapt to very different environments divided into ten agro-ecological zones. A better understanding of genomic differences and patterns of selection among agro-ecological zones could provide useful information in selection of specific adaptive traits in breeding.ResultsWe genotyped 438 wheat accessions from ten zones with kompetitive allele specific PCR (KASP) markers specific to 47 cloned genes for grain yield, quality, adaptation and stress resistance. Phylogenetic trees and principle component analysis revealed clear differences in winter and spring growth habits. Nucleotide diversity (π) and π ratio (πCL/πMCC) suggested that genetic diversity had increased during breeding, and that Chinese landraces (CL) from Zones I-V contributed little to modern Chinese cultivars (MCC). π ratio and Fst identified 24 KASP markers with 53 strong selection signals specific to Zones I (9 signals), II (12), III (5), IV (5), V (6), and VI (6). Genes with clear genetic differentiation and strong response to selection in at least three zones were leaf rust resistance gene Lr34 (I, II, III and IV), photoperiod sensitivity gene Ppd-D1 (I, II, III, IV and V), vernalization gene Vrn-B1 (V, VII, VIII and X), quality-related gene Glu-B1 (I, II and III) and yield-related genes Sus1-7B (I, II, III, IV and IX), Sus2-2A (I, II, III., IV and VI) and GW2-6B (II, V and VI).ConclusionsThis study examined selection of multiple genes in each zone, traced the distribution of important genetic variations and provided useful information for ecological genomics and enlightening future breeding goals for different agro-ecological zones.

【 授权许可】

CC BY