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).