Fluorescence imaging of light acclimation of brazilian atlantic forest tree species |
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Authors: | L Dos Anjos M A Oliva K N Kuki |
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Institution: | 1. Departamento de Biologia Vegetal, Universidade Federal de Vi?osa (DBV/UFV), Av. PH Rolfs, s/n, Vi?osa, MG 36571-000, Brazil
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Abstract: | In the pursuit of knowledge on the biological behavior of Brazilian Atlantic Forest tree species, this study evaluated the
susceptibility of the light-demanding species, Schinus terebinthifolia Raddi., Pseudobombax grandiflorum (Cav.) A. Robyns and Joannesia princeps Vell., and of the shade-tolerant species, Hymenaea courbaril L. var. stilbocarpa and Lecythis pisonis Camb, to photoinhibition and acclimation capacity. These species were first cultivated under two irradiance conditions, I20 (20% direct sunlight radiation) and I100 (all-sky or direct sunlight) and then transferred from I20 to I100. The effects of the sudden increase in light radiation intensity on photosynthetic activity were then evaluated through chlorophyll
(Chl) fluorescence imaging, HPLC xanthophylls analysis, and cell membrane lipid peroxidation measurements. Light-demanding
species were found to present a higher photochemical efficiency and higher acclimation capacity under high light irradiance
than shade-tolerant species. The higher photoinhibition tolerance observed in light-demanding species was associated to their
higher capacity for photochemical dissipation and dissipation of excess excitation energy via the xanthophyll cycle, leading to a lower ROS generation. The obtained results suggested that a knowledge of acclimation
capacity, by means of Chl fluorescence imaging yields, is a useful indicator of species successional grouping. |
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