NDLI: Genome-wide association analysis of seed germination percentage and germination index in Brassica napus L. under salt and drought stresses

Content Provider	Springer Nature Link
Author	Tan, Min Liao, Fang Hou, Lintao Wang, Jia Wei, Lijuan Jian, Hongju Xu, Xinfu Li, Jiana Liu, Liezhao
Copyright Year	2017
Abstract	Identifying genetic loci and possible candidate genes related to salt and drought stresses would be an economical, feasible and efficient way to accelerate the progress of abiotic tolerance breeding in rapeseed. In this study, a seed germination experiment using distilled water, salt and drought stresses was carried out with 520 B. napus germplasm resources. The rapeseed accessions showed large variation in the seed germination percentage (GP) and germination index (GI), with GP ranging from 26 to 100%, 0 to 100% and 0 to 100% and GI from 3.05 to 53.92, 0 to 24.50 and 0 to 25.00 in distilled water, under salt stress and drought stress, respectively. The coefficients of GP and GI were 0.72, 0.97 and 0.96 in distilled water, under salt stress and drought stress, respectively. A genome-wide association analysis of the 520 accessions was performed using the Q+K model and 31,839 single-nucleotide polymorphism (SNP) sites, revealing 23 SNPs associated with GP and 20 SNPs associated with GI under salt and drought stresses. The significant loci rs32406 and rs9466 on chromosome C08 and A04 were mapped to sites 3.32 and 2.20 kb from the salt- and drought-responsive gene BnaC08g41070 and drought-responsive gene BnaA04g02620D, respectively. BnaC06g01910D, a drought-responsive gene on chromosome C06, was found to overlap with the significant locus rs44427. In addition, 37 candidate genes associated with GP and GI under salt and drought stresses were detected. Most of these candidate genes regulate signal transduction and proline biosynthesis or encode a ubiquitin ligase E3; some have unknown biological functions and may respond to salt and drought stresses together as a complex network.
Starting Page	1
Ending Page	15
Page Count	15
File Format	PDF
ISSN	00142336
Journal	Euphytica
Volume Number	213
Issue Number	2
e-ISSN	15735060
Language	English
Publisher	Springer Netherlands
Publisher Date	2017-01-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Brassica napus L. GWAS Germination percentage Germination index Salt stress Drought stress Plant Sciences Plant Genetics & Genomics Plant Pathology Plant Physiology Biotechnology
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Horticulture Agronomy and Crop Science

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