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dc.creatorPanković, Dejana
dc.creatorSakac, Z
dc.creatorKevresan, S
dc.creatorPlesnicar, M
dc.date.accessioned2023-04-07T13:40:00Z
dc.date.available2023-04-07T13:40:00Z
dc.date.issued1999
dc.identifier.issn0022-0957
dc.identifier.urihttps://redun.educons.edu.rs/handle/123456789/25
dc.description.abstractThe influence of long-term water deficit on photosynthesis, electron transport and carbon metabolism of sunflower leaves has been examined. Water deficit was imposed from flower bud formation up to the stage of full flowering in the field on two sunflower hybrids with different drought tolerance. CO2 assimilation and stomatal conductance of the intact leaves, determined at atmospheric CO2 and full sunlight (1500-2000 mu mol quanta m(-2) s(-1)), decreased with water deficit, Maximum quantum efficiency of PSII (F-v/F-m) and relative quantum yield of PSII (Phi(II)) determined under similar experimental conditions, did not change significantly in severely stressed leaves. The strong inhibition of the plateau region of the light response curve, determined at high CO2 (5%) in water-deficient sunflower leaves, indicates that photosynthesis is also limited by non-stomatal factors. The decreased slope and the plateau of the CO2 response curves show that the capacity of carboxylation and RuBP regeneration decreased in severely stressed intact leaves. Rubisco specific activity decreased in severely stressed leaves, but Rubisco content increased under prolonged drought. The increase of Rubisco content was significantly higher in leaves of the drought-tolerant sunflower hybrid indicating that a higher Rubisco content could be one factor in conferring better acclimation and higher drought tolerance.en
dc.publisherOXFORD UNIV PRESS, OXFORD
dc.rightsrestrictedAccess
dc.sourceJournal of Experimental Botany
dc.subjectRubiscoen
dc.subjectHelianthus annuusen
dc.subjectgas exchangeen
dc.subjectdrought toleranceen
dc.subjectchlorophyll fluorescenceen
dc.titleAcclimation to long-term water deficit in the leaves of two sunflower hybrids: photosynthesis, electron transport and carbon metabolismen
dc.typearticle
dc.rights.licenseARR
dc.citation.epage138
dc.citation.issue330
dc.citation.other50(330): 127-138
dc.citation.rankM21
dc.citation.spage127
dc.citation.volume50
dc.identifier.doi10.1093/jexbot/50.330.127
dc.identifier.rcubconv_678
dc.identifier.wos000078128600015
dc.type.versionpublishedVersion


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