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DOI10.1007/s11120-018-0563-3
Photosynthetic heat tolerance of shade and sun leaves of three tropical tree species
Slot, Martijn1; Krause, G. Heinrich1,2; Krause, Barbara1; Hernandez, Georgia G.1; Winter, Klaus1
发表日期2019
ISSN0166-8595
EISSN1573-5079
卷号141期号:1页码:119-130
英文摘要

Previous studies of heat tolerance of tropical trees have focused on canopy leaves exposed to full sunlight and high temperatures. However, in lowland tropical forests with leaf area indices of 5-6, the vast majority of leaves experience varying degrees of shade and a reduced heat load compared to sun leaves. Here we tested whether heat tolerance is lower in shade than in sun leaves. For three tropical tree species, Calophyllum inophyllum, Inga spectabilis, and Ormosia macrocalyx, disks of fully developed shade and sun leaves were subjected to 15-min heat treatments, followed by measurement of chlorophyll a fluorescence after 48h of recovery. In two of the three species, the temperature causing a 50% decrease of the fluorescence ratio F-v/F-m (T-50) was significantly lower (by similar to 1.0 degrees C) in shade than in sun leaves, indicating a moderately decreased heat tolerance of shade leaves. In shade leaves of these two species, the rise in initial fluorescence, F-0, also occurred at lower temperatures. In the third species, there was no shade-sun difference in T-50. In situ measurements of photosynthetic CO2 assimilation showed that the optimum temperature for photosynthesis tended to be lower in shade leaves, although differences were not significant. At supra-optimal temperatures, photosynthesis was largely constrained by stomatal conductance, and the high-temperature CO2 compensation point, T-Max, occurred at considerably lower temperatures than T-50. Our study demonstrates that the temperature response of shade leaves of tropical trees differs only marginally from that of sun leaves, both in terms of heat tolerance and photosynthetic performance.


WOS研究方向Plant Sciences
来源期刊PHOTOSYNTHESIS RESEARCH
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/99652
作者单位1.Smithsonian Trop Res Inst, Apartado Postal 0843-03092, Panama City, Panama;
2.Heinrich Heine Univ Dusseldorf, Inst Plant Biochem, Univ Str 1, D-40225 Dusseldorf, Germany
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GB/T 7714
Slot, Martijn,Krause, G. Heinrich,Krause, Barbara,et al. Photosynthetic heat tolerance of shade and sun leaves of three tropical tree species[J],2019,141(1):119-130.
APA Slot, Martijn,Krause, G. Heinrich,Krause, Barbara,Hernandez, Georgia G.,&Winter, Klaus.(2019).Photosynthetic heat tolerance of shade and sun leaves of three tropical tree species.PHOTOSYNTHESIS RESEARCH,141(1),119-130.
MLA Slot, Martijn,et al."Photosynthetic heat tolerance of shade and sun leaves of three tropical tree species".PHOTOSYNTHESIS RESEARCH 141.1(2019):119-130.
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