Abstract
Abstract 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 ~1.8°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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Claims 9
Claim · model-written summary
Isoprene-emitting species had maximum temperatures for net photosynthesis about 1.8°C higher than non-emitters.
Verbatim
e0“Maximum temperatures for net photosynthesis were ~1.8°C higher for isoprene‐emitting species than for non‐emitters”
e1“tropical tree and liana species”
Claim · model-written summary
Photosynthetic thermal response curves were 24% wider in isoprene emitters.
Verbatim
e0“and thermal response curves were 24% wider”
e1“isoprene‐emitting species than for non‐emitters”
e2“tropical tree and liana species”
Claim · model-written summary
Optimum photosynthetic temperatures did not significantly differ between emitter groups.
- Taxon
- tropical tree and liana speciese2
- Compound
- isoprenee1
- Outcome
- optimum temperatures (T opt )e0
- Comparator
- non‐emitterse1
Not reportedDirection
Verbatim
e0“differences in optimum temperatures (T opt ) or photosynthetic rates at T opt were not significant”
e1“isoprene‐emitting species than for non‐emitters”
e2“tropical tree and liana species”
Claim · model-written summary
Photosynthetic rates at the optimum did not significantly differ between emitter groups.
- Taxon
- tropical tree and liana speciese2
- Compound
- isoprenee1
- Outcome
- photosynthetic rates at T opte0
- Comparator
- non‐emitterse1
Not reportedDirection
Verbatim
e0“differences in optimum temperatures (T opt ) or photosynthetic rates at T opt were not significant”
e1“isoprene‐emitting species than for non‐emitters”
e2“tropical tree and liana species”
Claim · model-written summary
Modeled carbon costs of even strong isoprene emissions caused little reduction in the net carbon assimilation advantage at supraoptimal temperatures.
Verbatim
e0“even strong emission rates cause little reduction in the net carbon assimilation advantage over non‐emitters at supraoptimal temperatures”
e1“tropical tree and liana species”
Claim · model-written summary
Isoprene emissions may alleviate biochemical limitations on photosynthesis above optimum temperature.
Verbatim
e0“Isoprene emissions may alleviate biochemical limitations, which together with stomatal conductance, co‐limit photosynthesis above T opt”
e1“tropical tree and liana species”
Claim · model-written summary
Biochemical limitations and stomatal conductance may jointly limit photosynthesis above optimum temperature.
Verbatim
e0“biochemical limitations, which together with stomatal conductance, co‐limit photosynthesis above T opt”
e1“tropical tree and liana species”
Claim · model-written summary
Isoprene emission may be an adaptation to warmer thermal niches.
- Taxon
- tropical tree and liana speciese1
- Compound
- isoprenee0
- Outcome
- adaptation to warmer thermal nichese0
Not reportedDirection
Verbatim
e0“isoprene emission may be an adaptation to warmer thermal niches”
e1“tropical tree and liana species”
Claim · model-written summary
Emitting species may fare better under global warming than co-occurring non-emitting species.
Verbatim
e0“emitting species may fare better under global warming than co‐occurring non‐emitting species”
e1“tropical tree and liana species”
e2“We classified species as isoprene emitters versus non‐emitters”