Genome-Wide Association Mapping for Heat and Drought Adaptive Traits in Pea

被引:9
|
作者
Tafesse, Endale G. [1 ]
Gali, Krishna K. [1 ]
Lachagari, V. B. Reddy [2 ]
Bueckert, Rosalind [1 ]
Warkentin, Thomas D. [1 ]
机构
[1] Univ Saskatchewan, Dept Plant Sci, Coll Agr & Bioresources, Saskatoon, SK S7N 5A8, Canada
[2] AgriGenome Labs Pvt Ltd, Hyderabad 500078, Telangana, India
关键词
pea; heat; drought; stress; genome-wide association study; genotyping-by-sequencing; marker-trait association; SPECTRAL REFLECTANCE INDEXES; PLANT-GROWTH; GRAIN-YIELD; STRESS; WHEAT; TEMPERATURE; ADAPTATION; RESISTANCE; MORPHOLOGY; TOLERANCE;
D O I
10.3390/genes12121897
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Heat and drought, individually or in combination, limit pea productivity. Fortunately, substantial genetic diversity exists in pea germplasm for traits related to abiotic stress resistance. Understanding the genetic basis of resistance could accelerate the development of stress-adaptive cultivars. We conducted a genome-wide association study (GWAS) in pea on six stress-adaptive traits with the aim to detect the genetic regions controlling these traits. One hundred and thirty-five genetically diverse pea accessions were phenotyped in field studies across three or five environments under stress and control conditions. To determine marker trait associations (MTAs), a total of 16,877 valuable single nucleotide polymorphisms (SNPs) were used in association analysis. Association mapping detected 15 MTAs that were significantly (p <= 0.0005) associated with the six stress-adaptive traits averaged across all environments and consistent in multiple individual environments. The identified MTAs were four for lamina wax, three for petiole wax, three for stem thickness, two for the flowering duration, one for the normalized difference vegetation index (NDVI), and two for the normalized pigment and chlorophyll index (NPCI). Sixteen candidate genes were identified within a 15 kb distance from either side of the markers. The detected MTAs and candidate genes have prospective use towards selecting stress-hardy pea cultivars in marker-assisted selection.
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页数:17
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