TY - JOUR
T1 - Mapping and characterisation of QTLxE interactions of grain and stover yield determining traits in pearl millet.
AU - Yadav, Rattan S.
AU - Bidinger, F. R.
AU - Hash, C. T.
AU - Yadav, Y. P.
AU - Yadav, O. P.
AU - Bhatnagar, S. K.
AU - Howarth, Catherine J.
N1 - Yadav, R. S., Bidinger, F. R., Hash, C. T., Yadav, Y. P., Yadav, O. P., Bhatnagar, S. K., Howarth, C. J. (2003). Mapping and characterisation of QTLxE interactions of grain and stover yield determining traits in pearl millet. Theoretical and Applied Genetics, 106, (3), 512-520.
Sponsorship: DFID
RONO;R7375
PY - 2003/2/1
Y1 - 2003/2/1
N2 - A mapping population of 104 F3 lines of pearl millet, derived from a cross between two inbred lines H 77/833-2 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 2 season interaction (G 2 S), and genotype 2 environment-within-season interaction [G 2 E(S)]. QTLs were determined for traits for their G, G 2 S, and G 2 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 2 S and/or G, G 2 S and G 2 E(S) effects. The major G 2 S QTLs detected were for flowering time (on LG 4 and LG 6), and mapped to the same intervals as G 2 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 2 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 2 E(S) interactions. The grain yield QTLs that were affected by QTL 2 E(S) interactions (mapping on LG 2 and LG 6), appeared to be linked to parallel QTL 2 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 2 E(S) interactions were more frequently observed for component traits of grain and stover yield, than for grain or stover yield per se.
AB - A mapping population of 104 F3 lines of pearl millet, derived from a cross between two inbred lines H 77/833-2 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 2 season interaction (G 2 S), and genotype 2 environment-within-season interaction [G 2 E(S)]. QTLs were determined for traits for their G, G 2 S, and G 2 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 2 S and/or G, G 2 S and G 2 E(S) effects. The major G 2 S QTLs detected were for flowering time (on LG 4 and LG 6), and mapped to the same intervals as G 2 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 2 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 2 E(S) interactions. The grain yield QTLs that were affected by QTL 2 E(S) interactions (mapping on LG 2 and LG 6), appeared to be linked to parallel QTL 2 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 2 E(S) interactions were more frequently observed for component traits of grain and stover yield, than for grain or stover yield per se.
KW - pearl millet genotypexenvironment interaction
KW - genetic mapping
KW - quantitative trait loci
KW - QTLxenvironment interaction
KW - market-assisted selection
U2 - 10.1007/s00122-002-1081-3
DO - 10.1007/s00122-002-1081-3
M3 - Article
C2 - 12589552
SN - 0040-5752
VL - 106
SP - 512
EP - 520
JO - Theoretical and Applied Genetics
JF - Theoretical and Applied Genetics
IS - 3
ER -