Exp. 2: LSSR predicts e-CO2 response also when measured at ambient CO2 level
In Exp. 2 we tested 17 highly diverse rice genotypes (including the five used by Fabre et al. 2020). A significant negative correlation was obtained between CO2 response and LSSR in Exp. 2, both for A max and grain yield, and both for LSSR measured under ambient and elevated CO2 levels (Fig. 2). However, as in Exp. 1 the correlation was much stronger when LSSR was measured under elevated than under ambient CO2 levels. Across the 17 genotypes, the LSSR measured at ambient CO2 level predicted 35% of variation of theA max response to elevated CO2(40% for grain yield response). By contrast, the LSSR measured at elevated CO2 predicted 67% of theA max response (56% for grain yield response).