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Título

Seasonal changes in xanthophyll composition and photosynthesis of cork oak (Quercus suber L.) leaves under mediterranean climate

AutorGarcía-Plazaola, José I.; Faria, T.; Abadía Bayona, Javier ; Chaves, M. M.; Pereira, J. S.
Fecha de publicación1997
EditorOxford University Press
CitaciónJournal of Experimental Botany 48(9): 1667-1674 (1997)
ResumenSeasonal changes in pigment composition of sun and shade leaves of cork oak (Quercus suber) were studied under field conditions in Portugal. Expanding leaves showed a high concentration of xanthophyll cycle components, violaxanthin, antheraxanthin and zeaxanthin. The pool of violaxanthin plus antheraxanthin plus zeaxanthin (V+A+Z) varied greatly between the seasons, being higher at the end of summer and in winter when photosynthesis was limited by water stress and cold, respectively. The size of V+A+Z pool was associated to synthesis of zeaxanthin in response to an excess of light. In sun leaves, midday A+Z relative content was positively correlated with the V+A+Z pool, whereas in shade leaves A+Z decreased with leaf ageing. In both leaf types A+Z was positively correlated with the non-photochemical quenching (NPQ) of chlorophyll a fluorescence. However, in winter NPQ did not change significantly throughout the day, whereas the (A+Z)/(V+A+Z) increased following the typical daily trend observed in other seasons.
Versión del editorhttp://jxb.oxfordjournals.org/cgi/reprint/48/9/1667
URIhttp://hdl.handle.net/10261/17146
ISSN1460-2431 (Online)
0022-0957 (Print)
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