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Resistance to low t...
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Lapointe, LineDep of Plant sciences, University of Wetern Ontario, Canada
(författare)
Resistance to low temperature photoinhibition is not associated with isolated thylakoid membranes of winter rye.
- Artikel/kapitelEngelska1991
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1991-10-01
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Oxford University Press (OUP),1991
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LIBRIS-ID:oai:DiVA.org:umu-84220
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-84220URI
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https://doi.org/10.1104/pp.97.2.804DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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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.
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Huner, NormanDep of Plant sciences, University of Western Ontario, Canada
(författare)
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Carpentier, RDep of Plant sciences, University of Western Ontario, Canada
(författare)
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Ottander, Christina,1962-Umeå universitet,Umeå forskningscentrum för matematikdidaktik (UFM)(Swepub:umu)chot0002
(författare)
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Dep of Plant sciences, University of Wetern Ontario, CanadaDep of Plant sciences, University of Western Ontario, Canada
(creator_code:org_t)
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Ingår i:Plant Physiology: Oxford University Press (OUP)97:2, s. 804-8100032-08891532-2548
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