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Resistance to low temperature photoinhibition is not associated with isolated thylakoid membranes of winter rye.
Dep of Plant sciences, University of Wetern Ontario, Canada.
Dep of Plant sciences, University of Western Ontario, Canada.
Dep of Plant sciences, University of Western Ontario, Canada.
Umeå University, Faculty of Science and Technology, Umeå Mathematics Education Research Centre (UMERC).ORCID iD: 0000-0002-5269-1451
1991 (English)In: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 97, no 2, 804-810 p.Article in journal (Refereed) Published
Abstract [en]

In vivo measurements of chlorophyll a fluorescence indicate that cold-hardened winter rye (Secale cereale L. cv Musketeer) develops a resistance to low temperature-induced photoinhibition compared with nonhardened rye. After 7.2 hours at 5 degrees C and 1550 micromoles per square meter per second, the ratio of variable fluorescence/maximum fluorescence was depressed by only 23% in cold-hardened rye compared with 46% in nonhardened rye. We have tested the hypothesis that the principal site of this resistance to photoinhibition resides at the level of rye thylakoid membranes. Thylakoids were isolated from cold-hardened and nonhardened rye and exposed to high irradiance (1000-2600 micromoles per square meter per second) at either 5 or 20 degrees C. The photoinhibitory response measured by room temperature fluorescence induction, photosystem II electron transport, photoacoustic spectroscopy, or [(14)C]atrazine binding indicates that the differential resistance to low temperature-induced photoinhibition in vivo is not observed in isolated thylakoids. Similar results were obtained whether isolated rye thylakoids were photoinhibited or thylakoids were isolated from rye leaves preexposed to a photoinhibitory treatment. Thus, we conclude that increased resistance to low temperature-induced photoinhibition is not a property of thylakoid membranes but is associated with a higher level of cellular organization.

Place, publisher, year, edition, pages
1991. Vol. 97, no 2, 804-810 p.
National Category
Botany
Research subject
Physiological Botany
Identifiers
URN: urn:nbn:se:umu:diva-84220DOI: 10.1104/pp.97.2.804ISI: A1991GM05700048PubMedID: 16668470OAI: oai:DiVA.org:umu-84220DiVA: diva2:680827
Available from: 2013-12-18 Created: 2013-12-18 Last updated: 2017-12-06Bibliographically approved

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