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

• Published in: Theoretical and applied genetics Vol. 106; no. 3; pp. 512 - 520
• Main Authors: YADAV, R. S, BIDINGER, F. R, HASH, C. T, YADAV, Y. P, YADAV, O. P, BHATNAGAR, S. K, HOWARTH, C. J
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.02.2003; Berlin
• Subjects: Biological and medical sciences; Chromosome Mapping; Classical genetics, quantitative genetics, hybrids; Crosses, Genetic; Environment; Fundamental and applied biological sciences. Psychology; Genetic Linkage; Genetic Markers; Genetics of eukaryotes. Biological and molecular evolution; Genotype; Pennisetum - genetics; Phenotype; Pteridophyta, spermatophyta; Quantitative Trait Loci; Quantitative Trait, Heritable; Vegetals; Genetic mapping; Monocotyledones; Marker-assisted selection; Grains; Genetic marker; Quantitative character; Pennisetum glaucum; Marker assisted selection; Environmental factor; Pearl millet; Cereal crop; Quantitative trait loci; QTLxenvironment interaction; Genotype environment interaction; Gramineae; Genotypexenvironment interaction; Angiospermae; Genetics; Spermatophyta; Inbred; Yield
• ISSN: 0040-5752; 1432-2242
• DOI: 10.1007/s00122-002-1081-3

A mapping population of 104 F(3) lines of pearl millet, derived from a cross between two inbred lines H 77/833-2 x 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 x season interaction (G x S), and genotype x environment-within-season interaction [G x E(S)]. QTLs were determined for traits for their G, G x S, and G x 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 x S and/or G, G x S and G x E(S) effects. The major G x S QTLs detected were for flowering time (on LG 4 and LG 6), and mapped to the same intervals as G x 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 x 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 x E(S) interactions. The grain yield QTLs that were affected by QTL x E(S) interactions (mapping on LG 2 and LG 6), appeared to be linked to parallel QTL x 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 x E(S) interactions were more frequently observed for component traits of grain and stover yield, than for grain or stover yield per se.