Chloroplastid pigment contents and chlorophyll a fluorescence in Amazonian tropical three species

Revista Árvore

Ronaldo Ribeiro De Morais¹  José Francisco De Carvalho Gonçalves²  Ulysses Moreira Dos Santos Júnior²  Oliver Dünisch²  André Luis Wendt Dos Santos² 

[1] ,Embrapa Amazônia Ocidental CPAA Manaus AM

关键词: Bertholletia excelsa;    Carapa guianensis;    Dipteryx odorata;    Bertholletia excelsa;    Carapa guianensis;    Dipteryx odorata;   

DOI  :  10.1590/S0100-67622007000500020

来源: SciELO

【 摘 要 】

Plants react to changes in light and hydrological conditions in terms of quantity and composition of chloroplastidic pigments, which affects the photosynthetic properties and consequently the accumulation of plant biomass. Thus, the chloroplastidic pigment concentration and chlorophyll a fluorescence of three Amazonian species (Bertholletia excelsa, Carapa guianensis e Dipteryx odorata) were investigated in sun and shade leaves form the tree crown collected during two distinct periods of precipitation (dry and rainy seasons). Pigment contents were determined by spectrophotometry and fluorescence variables were determined using a portable fluorometer. The results demonstrated that the species showed high concentrations of Chl a, Chl b e Chl total during the wet season in relation to the dry season, especially in shade leaves. A higher concentration of carotenoids was found in B. excelsa, when compared with leaves of C. guianensis and D. odorata. In leaves of B. excelsa and D. odorata no significant difference was found in relation to the photochemistry of photosystem II (Fv/Fm) between the wet and dry seasons. In conclusion, the three species react differently to variations in the light and precipitation conditions regarding light capture, aspects that might be considered in the management of forest plantations.

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