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Stomatal conductance responses to evaporative demand conferred by rice drought-yield quantitative trait locus qDTY(12.1)

Henry, Amelia; Stuart-Williams, Hilary; Dixit, Shalabh; Kumar, Arvind; Farquhar, Graham

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...[Show more]

dc.contributor.authorHenry, Amelia
dc.contributor.authorStuart-Williams, Hilary
dc.contributor.authorDixit, Shalabh
dc.contributor.authorKumar, Arvind
dc.contributor.authorFarquhar, Graham
dc.date.accessioned2020-06-04T00:45:52Z
dc.date.available2020-06-04T00:45:52Z
dc.identifier.issn1445-4408
dc.identifier.urihttp://hdl.handle.net/1885/204807
dc.description.abstractRice 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.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherCSIRO Publishing
dc.rights© CSIRO 2019 Open Access CC BY
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceFunctional Plant Biology
dc.titleStomatal conductance responses to evaporative demand conferred by rice drought-yield quantitative trait locus qDTY(12.1)
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume46
dc.date.issued2019
local.identifier.absfor070305 - Crop and Pasture Improvement (Selection and Breeding)
local.identifier.ariespublicationu3102795xPUB5061
local.publisher.urlhttps://www.publish.csiro.au/
local.type.statusPublished Version
local.contributor.affiliationHenry, Amelia, International Rice Research Institute
local.contributor.affiliationStuart-Williams, Hilary, College of Science, ANU
local.contributor.affiliationDixit, Shalabh, International Rice Research Institute
local.contributor.affiliationKumar, Arvind, International Rice Research Institute
local.contributor.affiliationFarquhar, Graham, College of Science, ANU
local.bibliographicCitation.issue7
local.bibliographicCitation.startpage660
local.bibliographicCitation.lastpage669
local.identifier.doi10.1071/FP18126
local.identifier.absseo820402 - Rice
dc.date.updated2019-12-19T07:18:56Z
local.identifier.thomsonIDWOS:000476795600006
dcterms.accessRightsOpen Access
dc.provenanceOpen Access CC BY
dc.rights.licenseCreative Commons Attribution (CC BY) license
CollectionsANU Research Publications

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