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Genes 2018, 9(2), 87; doi:10.3390/genes9020087

GWAS Uncovers Differential Genetic Bases for Drought and Salt Tolerances in Sesame at the Germination Stage

1
Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, No.2 Xudong 2nd Road, Wuhan 430062, China
2
Centre d’Etudes Régional Pour l’Amélioration de l’Adaptation à la Sécheresse (CERAAS), Route de Khombole, Thiès, BP 3320, Senegal
3
College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 200234, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 7 December 2017 / Revised: 25 January 2018 / Accepted: 8 February 2018 / Published: 14 February 2018
(This article belongs to the Section Plant Genetics and Genomics)
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Abstract

Sesame has great potential as an industrial crop but its production is challenged by drought and salt stresses. To unravel the genetic variants leading to salinity and drought tolerances at the germination stage, genome-wide association studies of stress tolerance indexes related to NaCl-salt and polyethylene glycol-drought induced stresses were performed with a diversity panel of 490 sesame accessions. An extensive variation was observed for drought and salt responses in the population and most of the accessions were moderately tolerant to both stresses. A total of 132 and 120 significant Single Nucleotide Polymorphisms (SNPs) resolved to nine and 15 Quantitative trait loci (QTLs) were detected for drought and salt stresses, respectively. Only two common QTLs for drought and salt responses were found located on linkage groups 5 and 7, respectively. This indicates that the genetic bases for drought and salt responses in sesame are different. A total of 13 and 27 potential candidate genes were uncovered for drought and salt tolerance indexes, respectively, encoding transcription factors, antioxidative enzymes, osmoprotectants and involved in hormonal biosynthesis, signal transduction or ion sequestration. The identified SNPs and potential candidate genes represent valuable resources for future functional characterization towards the enhancement of sesame cultivars for drought and salt tolerances. View Full-Text
Keywords: Sesamum indicum; drought stress; salt stress; GWAS; genetic variants; candidate genes Sesamum indicum; drought stress; salt stress; GWAS; genetic variants; candidate genes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, D.; Dossa, K.; Zhang, Y.; Wei, X.; Wang, L.; Zhang, Y.; Liu, A.; Zhou, R.; Zhang, X. GWAS Uncovers Differential Genetic Bases for Drought and Salt Tolerances in Sesame at the Germination Stage. Genes 2018, 9, 87.

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