Linkage mapping and QTL analysis of drought related traits in Groundnut (Arachis hypogaea L.)

Gautami, B (2012) Linkage mapping and QTL analysis of drought related traits in Groundnut (Arachis hypogaea L.). PhD thesis, International Crops Research Institute for the Semi-Arid Tropics.

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Supervisors

SupervisorsOrcid
Hoisington, D AICRISAT
Narasu, M LJNTUH

Abstract

Groundnut (Arachis hypogaea L.), commonly called peanut, is one of the most important oilseed crops in the smallholder-farming sectors of the semi-arid tropical regions of the world where drought is the major production constraint. Until recently, the low level of molecular diversity in the cultivated groundnut genome and the scarcity of co-dominant DNA-based molecular markers were critical constraints in using modern genomics in groundnut improvement. To increase the number of molecular markers for groundnut, 23 novel simple sequence repeat (SSR or micro-satellite) markers were isolated from a SSR-enriched genomic library. These new markers, along with 3215 already available markers from different sources were tested for detecting polymorphism among parental genotypes of the two recombinant inbred line (RIL) mapping populations (ICGS 76 × CSMG 84-1 and ICGS 44 × ICGS 76) to understand the genetic basis and identification of QTLs for drought related traits. As a result, two new genetic linkage maps were developed with 119 (2208 cM) and 82 (831 cM) marker loci. In addition, a consensus map consisting of 293 SSR loci located across 20 linkage groups and spanning a map distance of 2841 cM was constructed using the two new genetic maps (from the present study) and the reference map TAG 24 × ICGV 86031....

Item Type: Thesis (PhD)
Divisions: UNSPECIFIED
CGIAR Research Programs: UNSPECIFIED
Subjects: Mandate crops > Groundnut
Others > Genetics and Genomics
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 29 Jan 2013 05:44
Last Modified: 16 Sep 2013 09:47
URI: http://oar.icrisat.org/id/eprint/6479
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