TY - JOUR
T1 - Revisiting carbon isotope discrimination in C3 plants shows respiration rules when photosynthesis is low
AU - Busch, Florian A
AU - Holloway-Phillips, Meisha
AU - Stuart-Williams, Hilary
AU - Farquhar, Graham D
PY - 2020/3/9
Y1 - 2020/3/9
N2 - Stable isotopes are commonly used to study the diffusion of CO2 within photosynthetic plant tissues. The standard method used to interpret the observed preference for the lighter carbon isotope in C3 photosynthesis involves the model of Farquhar et al., which relates carbon isotope discrimination to physical and biochemical processes within the leaf. However, under many conditions the model returns unreasonable results for mesophyll conductance to CO2 diffusion (gm), especially when rates of photosynthesis are low. Here, we re-derive the carbon isotope discrimination model using modified assumptions related to the isotope effect of mitochondrial respiration. In particular, we treat the carbon pool associated with respiration as separate from the pool of primary assimilates. We experimentally test the model by comparing gm values measured with different CO2 source gases varying in their isotopic composition, and show that our new model returns matching gm values that are much more reasonable than those obtained with the previous model. We use our results to discuss CO2 diffusion properties within the mesophyll.
AB - Stable isotopes are commonly used to study the diffusion of CO2 within photosynthetic plant tissues. The standard method used to interpret the observed preference for the lighter carbon isotope in C3 photosynthesis involves the model of Farquhar et al., which relates carbon isotope discrimination to physical and biochemical processes within the leaf. However, under many conditions the model returns unreasonable results for mesophyll conductance to CO2 diffusion (gm), especially when rates of photosynthesis are low. Here, we re-derive the carbon isotope discrimination model using modified assumptions related to the isotope effect of mitochondrial respiration. In particular, we treat the carbon pool associated with respiration as separate from the pool of primary assimilates. We experimentally test the model by comparing gm values measured with different CO2 source gases varying in their isotopic composition, and show that our new model returns matching gm values that are much more reasonable than those obtained with the previous model. We use our results to discuss CO2 diffusion properties within the mesophyll.
UR - http://www.scopus.com/inward/record.url?scp=85081176923&partnerID=8YFLogxK
U2 - 10.1038/s41477-020-0606-6
DO - 10.1038/s41477-020-0606-6
M3 - Article
C2 - 32170287
SN - 2055-026X
VL - 6
SP - 245
EP - 258
JO - Nature Plants
JF - Nature Plants
IS - 3
ER -