PMID: 15227983Jul 2, 2004Paper

Response of photosynthesis and antioxygenic enzymes in seedlings of three tropical forest tree species to different light environments

Ying yong sheng tai xue bao = The journal of applied ecology
Xiaorong GuoZaifu Xu

Abstract

This paper studied the response of photosynthesis, chlorophyll a fluorescence and 3 antioxygenic enzyme activities in the seedlings of a pioneer species (Mallotus barbatus) and two endangered sub-canopy tree species (Litsea pierrei var. szemaois and L. dilleniifolia) in Xishuangbanna tropical rain forest to different light environments. Three light regimes (50%, 25% and 8% full sunlight) were designed for the seedlings. The largest values of maximum photosynthetic rates (Pmax) of L. pierrei var. szemaois and L. dilleniifolia were documented at 25% and 8% sunlight, respectively, which showed that the two sub-canopy species had poor ability in photosynthetic acclimation to high light. In contrast, the Pmax of M. barbatus increased with light level. During a day, the maximum photochemical efficiency (Fv/Fm) of the photosystem II in all the three species grown under three light levels showed minimum values at noon, and the lowest Fv/Fm values were shown in seedlings at 50% sunlight. Under 50% sunlight, the Fv/Fm values at dawn were lower in L. dilleniifolia than in the same species under other two light levels, indicating that sustained photoinhibition occurred in this case. The contents of malondialdehyde (MDA), H2O2, and activiti...Continue Reading

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