Exp. 1: LSSR predicts genotypic CO2response only when measured at elevated CO2
Fabre et al. (2020) proposed on the basis of 5 rice genotypes that LSSR may be a predictive proxy trait for A max response to elevated CO2. Exp. 1 was conducted to confirm this effect for 14 genotypes (which include 2 of the 5 genotypes used by Fabre et al. 2020; Table 1). As Fig. 1 demonstrates, the observedA max ratio between elevated and ambient CO2 levels was significantly (P<0.01), negatively correlated with LSSR measured under elevated CO2, but not with LSSR measured at the ambient CO2 level. The more detailed study Exp. 2 was therefore conducted to better understand parameter relationships for a partially overlapping but more diverse sample of genotypes.