CHANGES IN PHOTOSYSTEM-II FLUORESCENCE IN CHLAMYDOMONAS-REINHARDTII EXPOSED TO INCREASING LEVELS OF IRRADIANCE IN RELATIONSHIP TO THE PHOTOSYNTHETIC RESPONSE TO LIGHT

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Fältnamn	Indikatorer	Metadata
000		02444naa a2200289 4500
001		oai:DiVA.org:umu-46879
003		SwePub
008		110916s1992 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-468792 URI
024	7	a https://doi.org/10.1007/BF000495342 DOI
040		a (SwePub)umu
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a FALK, S4 aut
245	1 0	a CHANGES IN PHOTOSYSTEM-II FLUORESCENCE IN CHLAMYDOMONAS-REINHARDTII EXPOSED TO INCREASING LEVELS OF IRRADIANCE IN RELATIONSHIP TO THE PHOTOSYNTHETIC RESPONSE TO LIGHT
264	1	c 1992
338		a print2 rdacarrier
520		a The effects of a 60 min exposure to photosynthetic photon flux densities ranging from 300 to 2200-mu-mol m-2 s-1 on the photosynthetic light response curve and on PS II heterogeneity as reflected in chlorophyll a fluorescence were investigated using the unicellular green alga Chlamydomonas reinhardtii. It was established that exposure to high light acts at three different regulatory or inhibitory levels; 1) regulation occurs from 300 to 780-mu-mol m-2 s-1 where total amount of PS II centers and the shape of the light response curve is not significantly changed, 2) a first photoinhibitory range above 780 up to 1600-mu-mol m-2 s-1 where a progressive inhibition of the quantum yield and the rate of bending (convexity) of the light response curve can be related to the loss of Q(B)-reducing centers and 3) a second photoinhibitory range above 1600-mu-mol m-2 s-1 where the rate of light saturated photosynthesis also decreases and convexity reaches zero. This was related to a particularly large decrease in PS II(alpha) centers and a large increase in spill-over in energy to PS I.
700	1	a LEVERENZ, JW4 aut
700	1	a Samuelsson, Göran,d 1951-u Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)4 aut0 (Swepub:umu)gosa0002
700	1	a Oquist, Gunnar,d 1941-u Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)4 aut0 (Swepub:umu)guoq0001
710	2	a Umeå universitetb Institutionen för fysiologisk botanik4 org
773	0	t Photosynthesis Researchg 31:1, s. 31-40q 31:1<31-40x 0166-8595x 1573-5079
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-46879
856	4 8	u https://doi.org/10.1007/BF00049534

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Av författaren/redakt...: FALK, S; LEVERENZ, JW; Samuelsson, Göra ...; Oquist, Gunnar, ...

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Av lärosätet: Umeå universitet

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