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.