Mesophyll photosynthetic sensitivity to leaf water potential in Eucalyptus: A new dimension of plant adaptation to native moisture supply

Amanda Salvi, Duncan Smith, Mark Adams, Katherine McCulloh & Thomas J. Givnish
Photosynthetic sensitivity to drought is a fundamental constraint on land-plant evolution and ecosystem function. However, little is known about how the sensitivity of photosynthesis to non-stomatal limitations varies among species in the context of phylogenetic relationships. Using saplings of 10 Eucalyptus species, we measured maximum CO2-saturated photosynthesis using A-ci curves at several different leaf water potentials (PSIleaf) to quantify mesophyll photosynthetic sensitivity to PSIleaf (MPS), a measure of how rapidly non-stomatal limitations to carbon uptake...
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