期刊
TREE PHYSIOLOGY
卷 26, 期 2, 页码 249-256出版社
OXFORD UNIV PRESS
DOI: 10.1093/treephys/26.2.249
关键词
electron transport rate; nitrogen content; light-saturated rate of net photosynthesis; RuBP carboxylation; temperature dependency of photosynthetic rate
类别
The physiological basis of photosynthesis during winter was investigated in saplings of five evergreen broad-leaved species (Camellia japonica L., Cleyera japonica Thunb., Photinia glabra (Thunb.) Maxim., Castanopsis cuspidata (Thunb.) Schottky and Quercus glauca Thunb.) co-occurring under deciduous canopy trees in a temperate forest. We focused on temperature dependence of photosynthetic rate and capacity as important physiological parameters that determine light-saturated rates of net photosynthesis at low temperatures during winter. Under controlled temperature conditions, maximum rates of ribulose bisphosphate carboxylation and electron transport (V-cmax and J(max), respectively) increased exponentially with increasing leaf temperature. The temperature dependence of photosynthetic rate did not differ among species. In the field, photosynthetic capacity, determined as V-cmax and J(max) at a common temperature of 25 degrees C(V-cmax((25)) and J(max)((25))), increased until autumn and then decreased in species-specific patterns. Values of V-cmax((25)) and J(max)((25)) differed among species during winter. There was a positive correlation of V-cmax((25)) with area-based nitrogen concentration among leaves during winter in Camellia and Photinia. Interspecific differences in V-cmax((25)) were responsible for interspecific differences in light-saturated rates of net photosynthesis during winter.
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