期刊
EUPHYTICA
卷 172, 期 3, 页码 351-362出版社
SPRINGER
DOI: 10.1007/s10681-009-0108-0
关键词
Sorghum bicolor (L.) Moench; Stay-green; QTL introgression; Post-flowering drought tolerance
资金
- Generation Challenge Program (GCP)
- Ethiopian Government
- GCP
- CGIAR
Reduced leaf senescence (stay-green) has been demonstrated to improve tolerance of post-flowering moisture stress in grain sorghum. A number of quantitative trait loci (QTLs) associated with stay-green have been identified in sorghum, to facilitate transfer of this trait into adapted genetic backgrounds. This study reports initial evaluations, in both well watered and post-flowering stress environments, following partial introgression (BC2F3/BC1F4 generations) of four stable stay-green QTLs (StgB, Stg1, Stg3 and Stg4) from donor parent B35 to senescent variety R 16. The majority of the introgression lines had higher leaf chlorophyll levels at flowering (a distinctive trait of the donor parent) and a greater percentage green leaf area during the latter part of grain filling, than did R 16, indicating that the stay-green QTLs were expressed phenotypically in the R 16 background. None of the QTL introgression lines achieved the same level of stay-green as B35, however. Maintenance of a greater relative green leaf area during the latter half of grain filling was related to a greater relative grain yield in two of three post-flowering moisture deficit environments in which the materials were evaluated (r (2) = 0.34 in 2004-2005 and r (2) = 0.76 in 2005-2006), as was a direct measure of leaf chlorophyll in one of the post-flowering stress environments in which this was measured (r (2) = 0.42, P < 0.05). Thus the study provided useful evidence that the marker-assisted backcross transfer of stay-green QTLs from B35 into an adapted, but senescent background has the potential to enhance tolerance of post-flowering drought stress in sorghum.
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