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Titolo:
Response of Tradescantia albiflora to growth irradiance: Change versus changeability
Autore:
Anderson, JM; Chow, WS; Park, YI; Franklin, LA; Robinson, SPA; van Hasselt, PR;
Indirizzi:
Australian Natl Univ, Res Sch Biol Sci, Canberra, ACT 2601, Australia Australian Natl Univ Canberra ACT Australia 2601 rra, ACT 2601, Australia Chungnam Natl Univ, Dept Biol, Taejon 305764, South Korea Chungnam Natl Univ Taejon South Korea 305764 Taejon 305764, South Korea Univ Wollongong, Dept Biol Sci, Wollongong, NSW 2522, Australia Univ Wollongong Wollongong NSW Australia 2522 ongong, NSW 2522, Australia Univ Groningen, Lab Plant Physiol, NL-9750 AA Haren, Netherlands Univ Groningen Haren Netherlands NL-9750 AA L-9750 AA Haren, Netherlands
Titolo Testata:
PHOTOSYNTHESIS RESEARCH
fascicolo: 1-2, volume: 67, anno: 2001,
pagine: 103 - 112
SICI:
0166-8595(2001)67:1-2<103:ROTATG>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIGHT-HARVESTING COMPLEXES; PIGMENT-PROTEIN COMPLEXES; PHOTOSYSTEM-II; XANTHOPHYLL-CYCLE; CHLOROPHYLL FLUORESCENCE; PHOTOSYNTHETIC ACCLIMATION; INDUCIBLE PROTEINS; WILD-TYPE; IN-VIVO; LEAVES;
Keywords:
acclimation; Photosystem II; photoinactivation; non-photochemical quenching; xanthophyll cycle; zeaxanthin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Anderson, JM Australian Natl Univ, Res Sch Biol Sci, Canberra, ACT 2601, Australia Australian Natl Univ Canberra ACT Australia 2601 , Australia
Citazione:
J.M. Anderson et al., "Response of Tradescantia albiflora to growth irradiance: Change versus changeability", PHOTOSYN R, 67(1-2), 2001, pp. 103-112

Abstract

Most chloroplasts undergo changes in composition, function and structure in response to growth irradiance. However, Tradescantia albiflora, a facultative shade plant, is unable to modulate its light-harvesting components andhas the same Chi a/Chl b ratios and number of functional PS II and PS I reaction centres on a Chi basis at all growth irradiances. With increasing growth irradiance, Tradescantia leaves have the same relative amount of chlorophyll-proteins of PS II and PS I, but increased xanthophyll cycle components and more zeaxanthin formation under high light. Despite high-light leaves having enhanced xanthophyll cycle content, all Tradescantia leaves acclimated to varying growth irradiances have similar non-photochemical quenching. These data strongly suggest that not all of the zeaxanthin formed under high light is necessarily non-covalently bound to major and minor light-harvesting proteins of both photosystems, but free zeaxanthin may be associatedwith LHC II and LHC I or located in the lipid bilayer. Under the unusual circumstances in light-acclimated Tradescantia where the numbers of functional PS II and PS I reaction centres and their antenna size are unaltered during growth under different irradiances, the extents of PS II photoinactivation by high irradiances are comparable. This is due to the extent of PS II photoinactivation being a light dosage effect that depends on the input (photon exposure, antenna size) and output (photosynthetic capacity, non-radiative dissipation) parameters, which in Tradescantia are not greatly varied by changes in growth irradiance.

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Documento generato il 24/09/20 alle ore 21:16:40