Mapping and characterisation of QTL × E interactions for traits determining grain and stover yield in pearl millet

Yadav, R S and Bidinger, F R and Hash, C T and Yadav, Y P and Yadav, O P and Bhatnagar, S K and Howarth, C J (2003) Mapping and characterisation of QTL × E interactions for traits determining grain and stover yield in pearl millet. Theoretical and Applied Genetics, 106 (3). pp. 512-520. ISSN 0040-5752

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Abstract

A mapping population of 104 F3 lines of pearl millet, derived from a cross between two inbred lines H 77/833-2 × PRLT 2/89-33, was evaluated, as testcrosses on a common tester, for traits determining grain and stover yield in seven different field trials, distributed over 3 years and two seasons. The total genetic variation was partitioned into effects due to season (S), genotype (G), genotype × season interaction (G × S), and genotype × environment-within-season interaction [G × E(S)]. QTLs were determined for traits for their G, G × S, and G × E(S) effects, to assess the magnitude and the nature (cross over/non-crossover) of environmental interaction effects on individual QTLs. QTLs for some traits were associated with G effects only, while others were associated with the effects of both G and G × S and/or G, G × S and G × E(S) effects. The major G × S QTLs detected were for flowering time (on LG 4 and LG 6), and mapped to the same intervals as G × S QTLs for several other traits (including stover yield, harvest index, biomass yield and panicle number m-2). All three QTLs detected for grain yield were unaffected by G × S interaction however. All three QTLs for stover yield (mapping on LG 2, LG 4 and LG 6) and one of the three QTLs for grain yield (mapping on LG 4) were also free of QTL × E(S) interactions. The grain yield QTLs that were affected by QTL × E(S) interactions (mapping on LG 2 and LG 6), appeared to be linked to parallel QTL × E(S) interactions of the QTLs for panicle number m-2 on (LG 2) and of QTLs for both panicle number m-2 and harvest index (LG 6). In general, QTL × E(S) interactions were more frequently observed for component traits of grain and stover yield, than for grain or stover yield per se

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Pearl millet · Genotype×environment interaction · Genetic mapping · Quantitative trait loci · QTL×environment interaction · Marker-assisted selection
Subjects:	Mandate crops > Millets
Depositing User:	Ms K Syamalamba
Date Deposited:	04 Nov 2011 10:49
Last Modified:	04 Nov 2011 10:49
URI:	http://oar.icrisat.org/id/eprint/3668
Official URL:	http://dx.doi.org/10.1007/s00122-002-1081-3
Projects:	UNSPECIFIED
Funders:	UK Department for International Development (DFID)
Acknowledgement:	The authors thank Kirsten Skøt and P.V.M.D. Maheshwar Rao for their assistance during the field trials. This document is an output from a project (Plant Sciences Research Programme R6451) funded by the UK Department for International Development (DFID) and administered by the Centre for Arid Zone Studies (CAZS) for the benefit of developing countries. The views expressed are not necessarily those of DFID
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