Quantitative trait loci for the stay green trait in sorghum (Sorghum bicolor L. Moench): consistency across genetic backgrounds and environments

Subudhi, Prasanta K.; Rosenow, D. T.; Nguyen, Henry T.

doi:10.1007/s001220051538

Cited by 170 publications

(140 citation statements)

References 22 publications

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“…There, only TE had an influence on the residual grain yield variation under drought stress that was not explained by harvest index. The present results contrast with previous observations that four stay-green QTLs all showed consistency across different genetic backgrounds (Subudhi et al, 2000). It is clear from this work that stay-green is possibly related to different components such as TE and/or water extraction capacity, themselves likely to be an aggregate of different mechanisms.…”

Section: Yield and Relationships With Te And Hi -Influence Of Geneticcontrasting

confidence: 99%

Stay-green quantitative trait loci's effects on water extraction, transpiration efficiency and seed yield depend on recipient parent background

Vadez

Deshpande

Kholová

et al. 2011

Functional Plant Biol.

114

110

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Abstract. A stay-green phenotype enhances the adaptation of sorghum to terminal drought conditions, although the underlying physiological mechanisms leading to the expression of stay-green remain unclear. Differences in tillering and leaf area at anthesis, transpiration efficiency (TE), water extraction, harvest index (HI) and yield under both terminal drought and fully-irrigated conditions were assessed in 29 introgression lines (IL) developed targeting stay-green QTLs Stg1, Stg2, Stg3, Stg4, StgA, and StgB in S35 background, and 16 IL developed targeting Stg1, Stg3, Stg4, and StgB in R16

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Section: Yield and Relationships With Te And Hi -Influence Of Geneticcontrasting

confidence: 99%

Stay-green quantitative trait loci's effects on water extraction, transpiration efficiency and seed yield depend on recipient parent background

Vadez

Deshpande

Kholová

et al. 2011

Functional Plant Biol.

114

110

View full text Add to dashboard Cite

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“…It has a low grain yield under the conditions of this experiment, due to its short plant height, small panicle size, and low grain number. A number of stay-green QTLs have been identiWed by diVerent research groups based on RIL populations derived from crosses involving this line or its derivatives (Tuinstra et al 1996;Crasta et al 1999;Xu et al 2000b;Subudhi et al 2000;Sanchez et al 2002). The recurrent parent, R 16, is a released, high yielding but very senescent, post-rainy (rabi) season variety.…”

Section: Methodsmentioning

confidence: 99%

“…The trait is likely to be more easily manipulated using a marker-assisted breeding approach, using as selection criteria speciWc alleles at molecular loci linked to genomic regions contributing to the stay-green trait (i.e., quantitative trait loci = QTLs), identiWed in carefully managed, replicated, multi-environment tests. The work of diVerent groups has led to a better understanding of the inheritance of stay-green (Walulu et al 1994;van Oosterom et al 1996;Tuinstra et al 1997), to the mapping of QTLs associated with postXowering drought tolerance in sorghum (Tuinstra et al 1996(Tuinstra et al , 1998Crasta et al 1999;Tao et al 2000;Xu et al 2000b;Subudhi et al 2000;Kebede et al 2001;Sanchez et al 2002;Haussmann et al 2002) and identiWcation of markers linked to these QTLs (Hash et al 2003;Harris et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Stay-green expression in early generation sorghum [Sorghum bicolor (L.) Moench] QTL introgression lines

et al. 2009

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Reduced leaf senescence (stay-green) has been demonstrated to improve tolerance of post-Xowering moisture stress in grain sorghum. A number of quantitative trait loci (QTLs) associated with staygreen have been identiWed in sorghum, to facilitate transfer of this trait into adapted genetic backgrounds. This study reports initial evaluations, in both well watered and post-Xowering stress environments, following partial introgression (BC 2 F 3 /BC 1 F 4 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 Xowering (a distinctive trait of the donor parent) and a greater percentage green leaf area during the latter part of grain Wlling, 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 Wlling was related to a greater relative grain yield in two of three post-Xowering moisture deWcit 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-Xowering 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 staygreen QTLs from B35 into an adapted, but senescent background has the potential to enhance tolerance of post-Xowering drought stress in sorghum.

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“…Studies in sorghum have identified several QTLs for stay-green characters, which together explained more than half of the phenotypic variation in these qualities (Sanchez et al 2002). Multiple studies using crosses between different parental lines appear to have identified the same set of QTLs, on the basis of map location (Tuinstra et al 1997;Subudhi et al 2000;Tao et al 2000). The consistency of these QTLs among multiple sorghum crosses and in multiple environments indicates that allelic variants with large trait effects occur at relatively high frequencies at these loci among sorghum cultivars.…”

Section: Fig 1 Principles Of Qtl Mappingmentioning

confidence: 99%

Candidate Genes, Quantitative Trait Loci, and Functional Trait Evolution in Plants

Remington

Purugganan

2003

International Journal of Plant Sciences

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Two key characteristics of the neo-Darwinian synthesis in evolutionary biology have been its emphasis on the importance of mutations of small effect (micromutationism) and the view that studies of individual gene function shed relatively little light on evolutionary processes. Recent advances in molecular biology, however, have broken down many of the barriers between functional and evolutionary inquiry, opening the door to detailed studies of the genetic basis of functional trait evolution in plants. In this article, we review the insights into plant evolution that have been provided by molecular methods and address future research needs. Quantitative trait locus (QTL) mapping in crop and model plants has shown that individual loci often have large effects on trait variation, at variance with the micromutationist perspective. Evidence so far indicates that QTLs with large effects are also important in wild populations, underlying interspecific differences as well as intraspecific variation. Isolation of some of these QTLs, in particular for flowering time variation, has revealed a prominent role for regulatory genes known to function in regulation of flowering and exposed the complexity of regulatory processes. Preliminary evidence indicates that plant growth variation may be directly regulated rather than primarily the indirect result of selection on constituent processes. Future research should expand the number of traits that are intensively studied and make greater use of QTL mapping in wild plant taxa, especially those undergoing adaptive radiations, while continuing to draw on insights from model plants. Promising techniques include testing of candidate gene-trait associations in wild populations, genetic mapping in hybrid zones, and microarray analyses of gene expression.

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Quantitative trait loci for the stay green trait in sorghum (Sorghum bicolor L. Moench): consistency across genetic backgrounds and environments

Cited by 170 publications

References 22 publications

Stay-green quantitative trait loci's effects on water extraction, transpiration efficiency and seed yield depend on recipient parent background

Stay-green quantitative trait loci's effects on water extraction, transpiration efficiency and seed yield depend on recipient parent background

Stay-green expression in early generation sorghum [Sorghum bicolor (L.) Moench] QTL introgression lines

Candidate Genes, Quantitative Trait Loci, and Functional Trait Evolution in Plants

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