Acclimation of rice photosynthesis to irradiance under field conditions

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cg.contributor.affiliationUniversity of Sheffielden
cg.contributor.affiliationInternational Rice Research Instituteen
cg.identifier.doihttps://doi.org/10.1104/pp.011098en
cg.issn1532-2548en
cg.issue4en
cg.journalPLANT PHYSIOLOGYen
cg.volume130en
dc.contributor.authorMurchie, Erik H.en
dc.contributor.authorHubbart, Stellaen
dc.contributor.authorChen, Yizhuen
dc.contributor.authorPeng, Shaobingen
dc.contributor.authorHorton, Peteren
dc.date.accessioned2024-12-19T12:56:48Zen
dc.date.available2024-12-19T12:56:48Zen
dc.identifier.urihttps://hdl.handle.net/10568/166912
dc.titleAcclimation of rice photosynthesis to irradiance under field conditionsen
dcterms.abstractAcclimation to irradiance was measured in terms of light-saturated photosynthetic carbon assimilation rates (Pmax), Rubisco, and pigment content in mature field-grown rice (Oryza sativa) plants in tropical conditions. Measurements were made at different positions within the canopy alongside irradiance and daylight spectra. These data were compared with a second experiment in which acclimation to irradiance was assessed in uppermost leaves within whole-plant shading regimes (10% low light [LL], 40% medium light [ML], and 100% high light [HL] of full natural sunlight). Two varieties, japonica (tropical; new plant type [NPT]) and indica (IR72) were compared. Values for Rubisco amount, chlorophyll a/b, and Pmax all declined from the top to the base of the canopy. In the artificial shading experiment, acclimation of Pmax (measured at 350 μL L−1 CO2) occurred between LL and ML for IR72 with no difference observed between ML and HL. The Rubisco amount increased between ML and HL in IR72. A different pattern was seen for NPT with higher Pmax (measured at 350 μL L−1CO2) at LL than IR72 and some acclimation of this parameter between ML and HL. Rubisco levels were higher in NPT than IR72 contrasting with Pmax. Comparison of data from both experiments suggests a leaf aging effect between the uppermost two leaf positions, which was not a result of irradiance acclimation. Results are discussed in terms of: (a) acclimation of photosynthesis and radiation use efficiency at high irradiance in rice, and (b) factors controlling photosynthetic rates of leaves within the canopy.en
dcterms.available2002-12-06
dcterms.bibliographicCitationMurchie, Erik H.; Hubbart, Stella; Chen, Yizhu; Peng, Shaobing and Horton, Peter. 2002. Acclimation of rice photosynthesis to irradiance under field conditions.en
dcterms.extentpp. 1999-2010en
dcterms.issued2002-12-01
dcterms.languageen
dcterms.licenseCopyrighted; all rights reserved
dcterms.publisherOxford University Pressen
dcterms.subjectphotosynthesisen
dcterms.subjectacclimatizationen
dcterms.subjectirradiationen
dcterms.subjectribulose bisphosphate carboxylaseen
dcterms.subjectpigmentsen
dcterms.subjectcanopyen
dcterms.typeJournal Article

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