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Yield maintenance under drought: expansive growth and hydraulics also matter in reproductive organs

hal.structure.identifierÉcophysiologie des Plantes sous Stress environnementaux [LEPSE]
dc.contributor.authorTURC, Olivier
hal.structure.identifierÉcophysiologie des Plantes sous Stress environnementaux [LEPSE]
dc.contributor.authorOURY, Vincent
hal.structure.identifierBiologie du fruit et pathologie [BFP]
dc.contributor.authorGIBON, Yves
hal.structure.identifierBiologie du fruit et pathologie [BFP]
dc.contributor.authorPRODHOMME, Duyên
hal.structure.identifierÉcophysiologie des Plantes sous Stress environnementaux [LEPSE]
dc.contributor.authorTARDIEU, Francois
dc.date.issued2017
dc.date.conference2017-02-21
dc.description.abstractEnYield maintenance under drought in maize (Zea mays) is associatedwith flowering synchrony which requires the rapid extensionof styles and stigma (silks) to be accessible for pollen. Wehave shown that the control of grain set under moderate waterdeficits similar to those in the field result from a developmentalprocess linked to the timing of silk growth, in opposition to thecommon view that abortion is linked to the sugar metabolismin ovaries. A switch to abortion occurs 2-3 days after first silkemergence in water-stressed plants, when silk growth stops simultaneouslyfor all ovary cohorts, and explains abortion rates indifferent treatments, genotypes and positions on the ear. Analysesof transcripts and metabolites indicate that the first molecularevents occur in silks rather than in ovaries, and involve genesaffecting expansive growth rather than sugar metabolism. Sugaravailability is preserved in ovaries until the switch to abortion,and the disruption of carbon metabolism only occurs afterwards.Hence, changes in metabolite contents, transcript amounts andenzyme activities involved in ovary sugar metabolism would bea consequence rather than a cause of the beginning of ovaryabortion. Patterns of silk growth responses to environment sharecommon features with those of leaf growth, with both kineticand genetic evidences. These findings have large consequencesfor breeding drought tolerant maize and for modelling grainyields under drought. Oury et al (2016) Plant Physiology171: 986-996 and 171: 997-1008Turc et al (2016) New Phytologist 212: 377–388
dc.language.isoen
dc.rights.urihttp://creativecommons.org/licenses/by-sa/
dc.subjectzea mays
dc.subjectorgane reproducteur végétal
dc.subjectstress hydrique
dc.subjectavortement
dc.subjectcroissance végétale
dc.subjecttolérance à la sécheresse
dc.subjectcompétition source puits
dc.subjectmétabolisme du carbone
dc.subject.enindian corn
dc.subject.enplant sexual organ
dc.subject.enwater stress
dc.subject.eninduced abortion
dc.subject.enplant growth
dc.title.enYield maintenance under drought: expansive growth and hydraulics also matter in reproductive organs
dc.typeAutre communication scientifique (congrès sans actes - poster - séminaire...)
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
bordeaux.pagenp
bordeaux.countryIN
bordeaux.conference.cityHyderabad
bordeaux.peerReviewedoui
hal.identifierhal-01605905
hal.version1
hal.invitednon
hal.proceedingsoui
hal.conference.end2017-02-25
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01605905v1
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