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Photochemical efficiency of PSII and photoprotective pigments in seedlings and adults of two Proteaceae with different shade tolerance from the Chilean temperate rain forest RChHN
ALBERDI,MIREN; REYES-DÍAZ,MARJORIE; ZÚÑIGA,RAFAEL; HESS,SUSAN; BRAVO,LEÓN A; CORCUERA,LUIS J.
The seasonal variation in energy quenching parameters of photosystem II and photoprotective pigments were studied in seedlings and adults of two Proteaceae: a shade-intolerant species (Embotrium coccineum J.R. et G. Forster) and a shade-tolerant species (Lomatia ferruginea (Cav.) R. Br.). We postúlate that the shade intolerant species favors photochemical energy driven processes (mainly C0(2) assimilation) while the shade tolerant species exhibits higher non-photochemical energy dissipation under unfavorable conditions. Moreover, the shade tolerant species presents lower seasonal variations in these parameters that the shade intolerant species. Differences in energy dissipation should be more evident in seedlings than adults because of their contrasting...
Tipo: Journal article Palavras-chave: Chlorophyll fluorescence; Lutein; Photosynthesis; Photoprotective pigments; Xanthophyíls cycle.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000300006
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