Exploring and Mobilizing the Gene Bank Biodiversity for Wheat Improvement
Impact factor: 3.057 (Year: 2015)
Author(s)
Citation
Deepmala Sehgal, Prashant Vikram, Carolina Paola Sansaloni, Cynthia Ortiz, Carolina Saint Pierre, Thomas Payne, Marc Ellis, Ahmed Amri, César Daniel Petroli, Peter Wenzl, Sukhwinder Singh. (13/7/2015). Exploring and Mobilizing the Gene Bank Biodiversity for Wheat Improvement. PLoS ONE, 10 (7), pp. 1-18.
Abstract
Identifying and mobilizing useful genetic variation from germplasm banks to breeding programs
is an important strategy for sustaining crop genetic improvement. The molecular
diversity of 1,423 spring bread wheat accessions representing major global production environments
was investigated using high quality genotyping-by-sequencing (GBS) loci, and
gene-based markers for various adaptive and quality traits. Mean diversity index (DI) estimates
revealed synthetic hexaploids to be genetically more diverse (DI= 0.284) than elites
(DI = 0.267) and landraces (DI = 0.245). GBS markers discovered thousands of new SNP
variations in the landraces which were well known to be adapted to drought (1273 novel
GBS SNPs) and heat (4473 novel GBS SNPs) stress environments. This may open new
avenues for pre-breeding by enriching the elite germplasm with novel alleles for drought
and heat tolerance. Furthermore, new allelic variation for vernalization and glutenin genes
was also identified from 47 landraces originating from Iraq, Iran, India, Afghanistan, Pakistan,
Uzbekistan and Turkmenistan. The information generated in the study has been utilized
to select 200 diverse gene bank accessions to harness their potential in pre-breeding
and for allele mining of candidate genes for drought and heat stress tolerance, thus
channeling novel variation into breeding pipelines. This research is part of CIMMYT’s ongoing
‘Seeds of Discovery’ project visioning towards the development of high yielding wheat
varieties that address future challenges from climate change.
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Author(s) ORCID(s)
Amri, Ahmedhttps://orcid.org/0000-0003-0997-0276
Wenzl, Peterhttps://orcid.org/0000-0003-4657-8468
Subject(s)
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