期刊
PLANT CELL AND ENVIRONMENT
卷 42, 期 8, 页码 2448-2457出版社
WILEY
DOI: 10.1111/pce.13564
关键词
climate change; global warming; isoprene emission; leaf biochemistry; photosynthetic temperature response; plant functional traits; thermal tolerance; tropical forest
资金
- Smather's Family endowment to the University of Miami
- National Science Foundation Division of Biological Infrastructure [NSF-PRFB-1711997]
- Earl S Tupper postdoctoral fellowship
Experimental research shows that isoprene emission by plants can improve photosynthetic performance at high temperatures. But whether species that emit isoprene have higher thermal limits than non-emitting species remains largely untested. Tropical plants are adapted to narrow temperature ranges and global warming could result in significant ecosystem restructuring due to small variations in species' thermal tolerances. We compared photosynthetic temperature responses of 26 co-occurring tropical tree and liana species to test whether isoprene-emitting species are more tolerant to high temperatures. We classified species as isoprene emitters versus non-emitters based on published datasets. Maximum temperatures for net photosynthesis were similar to 1.8 degrees C higher for isoprene-emitting species than for non-emitters, and thermal response curves were 24% wider; differences in optimum temperatures (T-opt) or photosynthetic rates at T-opt were not significant. Modelling the carbon cost of isoprene emission, we show that even strong emission rates cause little reduction in the net carbon assimilation advantage over non-emitters at supraoptimal temperatures. Isoprene emissions may alleviate biochemical limitations, which together with stomatal conductance, co-limit photosynthesis above T-opt. Our findings provide evidence that isoprene emission may be an adaptation to warmer thermal niches, and that emitting species may fare better under global warming than co-occurring non-emitting species.
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