期刊
ECOLOGY LETTERS
卷 21, 期 3, 页码 376-383出版社
WILEY
DOI: 10.1111/ele.12905
关键词
Adaptation; C-4 photosynthesis; climate; evolution; phylogeny; temperature niche
类别
资金
- Royal Thai Government
- Royal Society University Research Fellowship [URF120119]
C-4 photosynthesis is considered an adaptation to warm climates, where its functional benefits are greatest and C-4 plants achieve their highest diversity and dominance. However, whether inherent physiological barriers impede the persistence of C-4 species in cool environments remains debated. Here, we use large grass phylogenetic and geographical distribution data sets to test whether (1) temperature influences the rate of C-4 origins, (2) photosynthetic types affect the rate of migration among climatic zones, and (3) C-4 evolution changes the breadth of the temperature niche. Our analyses show that C-4 photosynthesis in grasses originated in tropical climates, and that C-3 grasses were more likely to colonise cold climates. However, migration rates among tropical and temperate climates were higher in C-4 grasses. Therefore, while the origins of C-4 photosynthesis were concentrated in tropical climates, its physiological benefits across a broad temperature range expanded the niche into warmer climates and enabled diversification into cooler environments.
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