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Genetic analysis of post-flowering drought tolerance and components of grain development in Sorghum bicolor (L.) Moench

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Abstract

Drought is a serious agronomic problem and the single greatest factor contributing to crop yield loss in the world today. This problem may be alleviated by developing crops that are well adapted to dry-land environments. Sorghum (Sorghum bicolor (L.) Moench) is one of the most drought-tolerant grain crops and is an excellent crop model for evaluating mechanisms of drought tolerance. In this study, a set of 98 recombinant inbred (RI) sorghum lines was developed from a cross between two genotypes with contrasting drought reactions, TX7078 (pre-flowering-tolerant, post-flowering susceptible) and B35 (pre-flowering susceptible, post-flowering-tolerant). The RI population was characterized under drought and non-drought conditions for the inheritance of traits associated with post-flowering drought tolerance and for potentially related components of grain development. Quantitative trait loci (QTL) analysis identified 13 regions of the genome associated with one or more measures of post-flowering drought tolerance. Two QTL were identified with major effects on yield and 'staygreen’ under post-flowering drought. These loci were also associated with yield under fully irrigated conditions suggesting that these tolerance loci have pleiotropic effects on yield under non-drought conditions. Loci associated with rate and/or duration of grain development were also identified. QTL analysis indicated many loci that were associated with both rate and duration of grain development. High rate and short duration of grain development were generally associated with larger seed size, but only two of these loci were associated with differences in stability of performance under drought.

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Authors and Affiliations

  1. Department of Horticulture, USA

    Mitchell R. Tuinstra & Peter B. Goldsbrough

  2. Department of Agronomy, Purdue University, West Lafayette, IN, 47907, USA

    Edwin M. Grote & Gebisa Ejeta

Authors
  1. Mitchell R. Tuinstra
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  2. Edwin M. Grote
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  3. Peter B. Goldsbrough
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  4. Gebisa Ejeta
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Tuinstra, M.R., Grote, E.M., Goldsbrough, P.B. et al. Genetic analysis of post-flowering drought tolerance and components of grain development in Sorghum bicolor (L.) Moench. Molecular Breeding 3, 439–448 (1997). https://doi.org/10.1023/A:1009673126345

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