Why is rice Amax (at saturating CO2) more heritable than Asat (at ambient CO2)? A commentary on Acevedo‐Siaca et al. (2021)
Fabre, Denis | Dingkuhn, Michael
Acevedo‐Siaca et al. (2021) reported that Aₘₐₓ (at saturating CO₂) is more heritable than Aₛₐₜ (at ambient CO₂) in rice and suggested the former to be selected to improve photosynthesis under rising ambient [CO₂] levels. This commentary hypothesizes sink limitation to be a factor contributing to low genotypic Aₘₐₓ via feedback inhibition (acclimation) of photosynthesis as observed under elevated [CO₂]. This process may to some extent also happen under current ambient [CO₂]. If confirmed, future breeding for greater photosynthesis should seek improving carbon sink traits as opposed to (or in addition to) modifying the photosynthetic apparatus, which is more difficult.
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