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Type: Artigo de periódico
Title: Photosynthetic response of two tropical liana species grown under different irradiances
Author: Sanches, MC
Vaio, IFM
Abstract: We investigated the characteristics of gaseous exchanges and chlorophyll a fluorescence under different irradiances in two liana species Canavalia parviflora Benth. (Fabaceae) and Gouania virgata Reissk (Rhamnaceae), both of a semi-deciduous tropical forest of Southeast Brazil. We used cultivated plants growing under irradiances of 100, 40, 10, and 1.5 % of the photosynthetic photon flux density (PPFD). Higher net photosynthetic rates (P(N)) were observed during early morning under full sunlight. After this, reduced P(N) values were recorded due to pronounced stomatal closure. In Canavalia, the gas exchange responses diminished concomitant with reduced irradiance. Gouania exhibited a narrower range of response, with high P(N) values even at 10 % PPFD. Marked reduction of the effective photochemical yield (Delta F/F(m)') near midday was observed, followed by increases in the non-photochemical quenching for both species under full sunlight. Despite the common occurrence of these species in open areas of the forest, both were able to maintain relatively high P(N) in shaded environments. We suggest that lianas present an intermediate physiological behaviour between shade and non-shade tolerant species.
Subject: acclimation to irradiance
Canavalia parviflora
chlorophyll fluorescence
Gouania virgata
non-photochemical quenching
semi-deciduous tropical forest
stomatal conductance
transpiration rate
water use efficiency
Country: Holanda
Editor: Springer
Rights: fechado
Identifier DOI: 10.1007/s11099-008-0094-9
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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