Stomatal conductance responses to evaporative demand conferred by rice drought-yield quantitative trait locus qDTY12.1
Rice quantitative trait locus (QTL) qDTY12.1 is a major-effect drought yield QTL that was identified from a cross of Vandana (recipient parent) and Way Rarem (donor parent) through breeding efforts to improve rice yield under upland drought stress conditions. The two main physiological effects previ...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Commonwealth Scientific and Industrial Research Organisation
2019
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| Online Access: | https://hdl.handle.net/10568/164751 |
| _version_ | 1855541933065109504 |
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| author | Henry, Amelia Stuart-Williams, Hilary Dixit, Shalabh Kumar, Arvind Farquhar, Graham |
| author_browse | Dixit, Shalabh Farquhar, Graham Henry, Amelia Kumar, Arvind Stuart-Williams, Hilary |
| author_facet | Henry, Amelia Stuart-Williams, Hilary Dixit, Shalabh Kumar, Arvind Farquhar, Graham |
| author_sort | Henry, Amelia |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Rice quantitative trait locus (QTL) qDTY12.1 is a major-effect drought yield QTL that was identified from a cross of Vandana (recipient parent) and Way Rarem (donor parent) through breeding efforts to improve rice yield under upland drought stress conditions. The two main physiological effects previously observed to be related to the presence of qDTY12.1 were (i) increased lateral root growth, and (ii) increased transpiration efficiency. Since relatively more progress has thus far been made on characterising the lateral root growth response related to qDTY12.1, the present study focussed on characterising how qDTY12.1 confers higher transpiration efficiency under upland drought stress in the Vandana background. In a series of field experiments in which stomatal conductance was measured across different times of day in four qDTY12.1 near isogenic lines (NILs), the NILs and Way Rarem showed consistently higher stomatal conductance than Vandana under conditions of low vapour pressure deficit (VPD) and low photosynthetically active radiation (PAR), and consistently lower stomatal conductance than Vandana under high VPD and high PAR. Leaf δ18O was higher in the qDTY12.1 NIL than in Vandana, and although this trend was previously observed for leaf δ13C it appeared to be more consistent across measurement dates and treatments for leaf δ18O. The qDTY12.1 NILs and Way Rarem tended to show greater large vein to small vein interveinal distance and mesophyll area than Vandana, also consistent across treatments. In terms of aquaporin-related plant hydraulics, variation among NILs in terms of aquaporin inhibition of root hydraulic conductivity (Lpr) was observed, with the highest-yielding NIL showing a lack of Lpr inhibition similar to Way Rarem. The results reported here suggest that the effects of qDTY12.1 are in response not only to soil moisture, but also to atmospheric conditions. An interaction among multiple mechanisms including leaf anatomy and aquaporin function appear to confer the transpiration efficiency effect of qDTY12.1. |
| format | Journal Article |
| id | CGSpace164751 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | Commonwealth Scientific and Industrial Research Organisation |
| publisherStr | Commonwealth Scientific and Industrial Research Organisation |
| record_format | dspace |
| spelling | CGSpace1647512025-12-17T08:03:25Z Stomatal conductance responses to evaporative demand conferred by rice drought-yield quantitative trait locus qDTY12.1 Henry, Amelia Stuart-Williams, Hilary Dixit, Shalabh Kumar, Arvind Farquhar, Graham agronomy and crop science plant science Rice quantitative trait locus (QTL) qDTY12.1 is a major-effect drought yield QTL that was identified from a cross of Vandana (recipient parent) and Way Rarem (donor parent) through breeding efforts to improve rice yield under upland drought stress conditions. The two main physiological effects previously observed to be related to the presence of qDTY12.1 were (i) increased lateral root growth, and (ii) increased transpiration efficiency. Since relatively more progress has thus far been made on characterising the lateral root growth response related to qDTY12.1, the present study focussed on characterising how qDTY12.1 confers higher transpiration efficiency under upland drought stress in the Vandana background. In a series of field experiments in which stomatal conductance was measured across different times of day in four qDTY12.1 near isogenic lines (NILs), the NILs and Way Rarem showed consistently higher stomatal conductance than Vandana under conditions of low vapour pressure deficit (VPD) and low photosynthetically active radiation (PAR), and consistently lower stomatal conductance than Vandana under high VPD and high PAR. Leaf δ18O was higher in the qDTY12.1 NIL than in Vandana, and although this trend was previously observed for leaf δ13C it appeared to be more consistent across measurement dates and treatments for leaf δ18O. The qDTY12.1 NILs and Way Rarem tended to show greater large vein to small vein interveinal distance and mesophyll area than Vandana, also consistent across treatments. In terms of aquaporin-related plant hydraulics, variation among NILs in terms of aquaporin inhibition of root hydraulic conductivity (Lpr) was observed, with the highest-yielding NIL showing a lack of Lpr inhibition similar to Way Rarem. The results reported here suggest that the effects of qDTY12.1 are in response not only to soil moisture, but also to atmospheric conditions. An interaction among multiple mechanisms including leaf anatomy and aquaporin function appear to confer the transpiration efficiency effect of qDTY12.1. 2019 2024-12-19T12:54:15Z 2024-12-19T12:54:15Z Journal Article https://hdl.handle.net/10568/164751 en Commonwealth Scientific and Industrial Research Organisation Henry, Amelia; Stuart-Williams, Hilary; Dixit, Shalabh; Kumar, Arvind and Farquhar, Graham. 2019. Stomatal conductance responses to evaporative demand conferred by rice drought-yield quantitative trait locus qDTY12.1. Functional Plant Biol., Volume 46 no. 7 p. 660 |
| spellingShingle | agronomy and crop science plant science Henry, Amelia Stuart-Williams, Hilary Dixit, Shalabh Kumar, Arvind Farquhar, Graham Stomatal conductance responses to evaporative demand conferred by rice drought-yield quantitative trait locus qDTY12.1 |
| title | Stomatal conductance responses to evaporative demand conferred by rice drought-yield quantitative trait locus qDTY12.1 |
| title_full | Stomatal conductance responses to evaporative demand conferred by rice drought-yield quantitative trait locus qDTY12.1 |
| title_fullStr | Stomatal conductance responses to evaporative demand conferred by rice drought-yield quantitative trait locus qDTY12.1 |
| title_full_unstemmed | Stomatal conductance responses to evaporative demand conferred by rice drought-yield quantitative trait locus qDTY12.1 |
| title_short | Stomatal conductance responses to evaporative demand conferred by rice drought-yield quantitative trait locus qDTY12.1 |
| title_sort | stomatal conductance responses to evaporative demand conferred by rice drought yield quantitative trait locus qdty12 1 |
| topic | agronomy and crop science plant science |
| url | https://hdl.handle.net/10568/164751 |
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