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Is change in ovary carbon status a cause or a consequence of maize ovary abortion in water deficit during flowering?

hal.structure.identifierÉcophysiologie des Plantes sous Stress environnementaux [LEPSE]
dc.contributor.authorOURY, Vincent
hal.structure.identifierÉcophysiologie des Plantes sous Stress environnementaux [LEPSE]
dc.contributor.authorCALDEIRA, Cecilio Frois
hal.structure.identifierBiologie du fruit et pathologie [BFP]
dc.contributor.authorPRODHOMME, Duyên
hal.structure.identifierCentre de Recherche de Chappes
dc.contributor.authorPICHON, Jean-Philippe
hal.structure.identifierBiologie du fruit et pathologie [BFP]
dc.contributor.authorGIBON, Yves
hal.structure.identifierÉcophysiologie des Plantes sous Stress environnementaux [LEPSE]
dc.contributor.authorTARDIEU, Francois
hal.structure.identifierÉcophysiologie des Plantes sous Stress environnementaux [LEPSE]
dc.contributor.authorTURC, Olivier
dc.date.issued2016
dc.identifier.issn0032-0889
dc.description.abstractEnFlower or grain abortion causes large yield losses under water deficit. In maize (Zea mays), it is often attributed to a carbon limitation via the disruption of sucrose cleavage by cell wall invertases in developing ovaries. We have tested this hypothesis versus another linked to the expansive growth of ovaries and silks. We have measured, in silks and ovaries of well-watered or moderately droughted plants, the transcript abundances of genes involved in either tissue expansion or sugar metabolism, together with the concentrations and amounts of sugars, and with the activities of major enzymes of carbon metabolism. Photosynthesis and indicators of sugar export, measured during water deprivation, suggested sugar export maintained by the leaf. The first molecular changes occurred in silks rather than in ovaries and involved genes affecting expansive growth rather than sugar metabolism. Changes in the concentrations and amounts of sugars and in the activities of enzymes of sugar metabolism occurred in apical ovaries that eventually aborted, but probably after the switch to abortion of these ovaries. Hence, we propose that, under moderate water deficits corresponding to most European drought scenarios, changes in carbon metabolism during flowering time are a consequence rather than a cause of the beginning of ovary abortion. A carbon-driven ovary abortion may occur later in the cycle in the case of carbon shortage or under very severe water deficits. These findings support the view that, until the end of silking, expansive growth of reproductive organs is the primary event leading to abortion, rather than a disruption of carbon metabolism.
dc.description.sponsorshipUn maïs adapté à la sécheresse : développement de l'épi et surface foliaire - ANR-08-GENM-0003
dc.language.isoen
dc.publisherOxford University Press ; American Society of Plant Biologists
dc.title.enIs change in ovary carbon status a cause or a consequence of maize ovary abortion in water deficit during flowering?
dc.typeArticle de revue
dc.identifier.doi10.1104/pp.15.01130
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
dc.description.sponsorshipEuropeDrought-tolerant yielding plants
bordeaux.journalPlant Physiology
bordeaux.page997-1008
bordeaux.volume71
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-02631520
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02631520v1
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