Construction of genotyping-by-sequencing based high-density genetic maps and QTL mapping for fusarium wilt resistance in pigeonpea

Rachit K. Saxena, Vikas K. Singh, Sandip M. Kale, Revathi Tathineni, Swathi Parupalli, Vinay Kumar, Vanika Garg, Roma R. Das, Mamta Sharma, Kalinati Narasimhan Yamini, Sonnappa Muniswamy, Anuradha Ghanta, Abhishek Rathore, C. V.Sameer Kumar, K. B. Saxena, P. B.Kavi Kishor, Rajeev K. Varshney

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23 Citations (Scopus)

Abstract

Fusarium wilt (FW) is one of the most important biotic stresses causing yield losses in pigeonpea. Genetic improvement of pigeonpea through genomics-assisted breeding (GAB) is an economically feasible option for the development of high yielding FW resistant genotypes. In this context, two recombinant inbred lines (RILs) (ICPB 2049 × ICPL 99050 designated as PRIL-A and ICPL 20096 × ICPL 332 designated as PRIL-B) and one F2 (ICPL 85063 × ICPL 87119) populations were used for the development of high density genetic maps. Genotyping-by-sequencing (GBS) approach was used to identify and genotype SNPs in three mapping populations. As a result, three high density genetic maps with 964, 1101 and 557 SNPs with an average marker distance of 1.16, 0.84 and 2.60 cM were developed in PRIL-A, PRIL-B and F2, respectively. Based on the multi-location and multi-year phenotypic data of FW resistance a total of 14 quantitative trait loci (QTLs) including six major QTLs explaining >10% phenotypic variance explained (PVE) were identified. Comparative analysis across the populations has revealed three important QTLs (qFW11.1, qFW11.2 and qFW11.3) with upto 56.45% PVE for FW resistance. This is the first report of QTL mapping for FW resistance in pigeonpea and identified genomic region could be utilized in GAB.

Original languageEnglish
Article number1911
JournalScientific Reports
Volume7
Issue number1
DOIs
Publication statusPublished - 1 Dec 2017

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