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Resistance to low t...
Resistance to low temperature photoinhibition is not associated with isolated thylakoid membranes of winter rye.
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- Lapointe, Line (författare)
- Dep of Plant sciences, University of Wetern Ontario, Canada
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- Huner, Norman (författare)
- Dep of Plant sciences, University of Western Ontario, Canada
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- Carpentier, R (författare)
- Dep of Plant sciences, University of Western Ontario, Canada
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- Ottander, Christina, 1962- (författare)
- Umeå universitet,Umeå forskningscentrum för matematikdidaktik (UFM)
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(creator_code:org_t)
- 1991-10-01
- 1991
- Engelska.
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Ingår i: Plant Physiology. - : Oxford University Press (OUP). - 0032-0889 .- 1532-2548. ; 97:2, s. 804-810
- Relaterad länk:
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http://www.plantphys...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Biologi -- Botanik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Botany (hsv//eng)
Nyckelord
- Physiological Botany
- fysiologisk botanik
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- ref (ämneskategori)
- art (ämneskategori)
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