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

Vadez, Vincent, Deshpande, Santosh P., Kholova, Jana, Hammer, Graeme L., Borrell, Andrew K., Talwar, Harvinder S. and Hash, C. Thomas (2011) Stay-green quantitative trait loci's effects on water extraction, transpiration efficiency and seed yield depend on recipient parent background. Functional Plant Biology, 38 7: 553-566. doi:10.1071/FP11073


Author Vadez, Vincent
Deshpande, Santosh P.
Kholova, Jana
Hammer, Graeme L.
Borrell, Andrew K.
Talwar, Harvinder S.
Hash, C. Thomas
Title Stay-green quantitative trait loci's effects on water extraction, transpiration efficiency and seed yield depend on recipient parent background
Journal name Functional Plant Biology   Check publisher's open access policy
ISSN 1445-4408
1445-4416
Publication date 2011-01-01
Sub-type Article (original research)
DOI 10.1071/FP11073
Volume 38
Issue 7
Start page 553
End page 566
Total pages 14
Place of publication Collingwood, VIC, Australia
Publisher CSIRO Publishing
Language eng
Formatted abstract
A stay-green phenotype enhances the adaptation of sorghum (Sorghum bicolor (L.) Moench) to terminal drought, although the mechanisms leading to its expression remain unclear. Differences in tillering and leaf area at anthesis, transpiration efficiency (TE), water extraction, harvest index (HI) and yield under terminal drought and fully irrigated conditions were assessed in 29 introgression lines (IL) targeting stay-green quantitative trait loci (QTLs) Stg1, Stg2, Stg3, Stg4, StgA and StgB in an S35 background, and 16 IL targeting Stg1, Stg3, Stg4 and StgB in an R16 background. TE was increased by StgB in the R16 background, whereas there was no effect in the S35 background. Water extraction was increased by Stg1 in the S35 background but not in R16. StgB modified the proportion of water extracted before and after anthesis in the S35 background. While tillering and leaf area at anthesis were decreased by Stg1 and Stg3 in S35, there was no effect in R16. Yield data under fully irrigated conditions showed higher tiller grain yield in Stg1, Stg2 and Stg3 ILs. Although yield differences were mostly explained by HI variation, the yield variation unexplained by HI was closely related to TE in S35 (R2 = 0.29) and R16 (R2 = 0.72), and was closely related to total water extracted in S35 (R2 = 0.41) but not in R16. These data indicate the potential for several stay-green QTLs to affect traits related to plant water use. However, these effects depend on the interaction between the genetic background and individual QTLs.
Keyword Genetic background
Lysimeters
Root
Sorghum
Bicolor L. Moench
Drought tolerance
Genetic-variation
Grain-sorghum
R. Br.
Maize
Wheat
Growth
Lines
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
Queensland Alliance for Agriculture and Food Innovation
 
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