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CROP BREEDING & GENETICS

Quantitative Trait Loci for Grain Yield in Pearl Millet under Variable Postflowering Moisture Conditions

^a International Crops Research Inst. for the Semi-Arid Tropics (ICRISAT), Patancheru P.O., Andhra Pradesh 502 324, India
^b Inst. of Grassland and Environmental Research, Aberystwyth, SY23 3EB, UK

^* Corresponding author (t.nepolean{at}cgiar.org).

Pearl millet marker-assisted selection (MAS) programs targeting adaptation to variable postflowering moisture environments would benefit from quantitative trait loci (QTLs) that improve grain yield across the full range of postflowering moisture conditions, rather than just in drought-stressed environments. This research was undertaken to identify such QTLs from an extensive (12-environment) phenotyping data set that included both stressed and unstressed postflowering environments. Genetic materials were test crosses of 79 F₂–derived F₄ progenies from a mapping population based on a widely adapted maintainer line (ICMB 841) x a postflowering drought-tolerant maintainer (863B). Three QTLs (on linkage group [LG] 2, LG 3, and LG 4) were identified as primary candidates for MAS for improved grain yield across variable postflowering moisture environments. The QTLs on LG 2 and LG 3 (the most promising) explained a useful proportion (13–25%) of phenotypic variance for grain yield across environments. They also co-mapped with QTLs for harvest index across environments, and with QTLs for both grain number and individual grain mass under severe terminal stress. Neither had a significant QTL x environment interaction, indicating that their predicted effects should occur across a broad range of available moisture environments. We have estimated the benefits in grain yield and accompanying changes in yield components and partitioning indices that would be expected as a result of incorporating these QTLs into other genetic backgrounds by MAS.

Abbreviations: BLUP, best linear unbiased predictor • GRMA, individual grain mass • GRNO, grain number • GRYLD, grain yield • HI, harvest index • LG, linkage group • LOD, logarithm of odds • MAS, marker-assisted selection • PNHI, panicle harvest index • QTL, quantitative trait locus • RFLP, restriction fragment length polymorphism • SSR, simple sequence repeat.

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