Physiological basis of the difference in net photosynthetic rate of leaves between two maize strains

TLDR: Significant differences in net photosynthetic rate of leaves between two maize strains (Shuang 105 and 40×44) grown in the field were observed and the differences did not result from the difference in gs, but probably from that in light reaction system.

Abstract: Significant differences in net photosynthetic rate (P N) of leaves between two maize (Zea mays L) strains (Shuang 105 and 40×44) grown in the field were observed At several growth stages, P N of 40×44 was higher than that of Shuang 105 (from 103 to 325 %) Moreover, the strain 40×44 had a higher plant height, larger leaf area, lower chlorophyll content, and higher photochemical efficiency of photosystem 2 (PS2) (Fv/Fm and ΔF/Fm′) than strain Shuang 105 Shuang 105, which showed lower P N, had lower stomatal conductances (g s) but slightly higher intercellular CO2 concentrations (C i) than those of 40×44 Hence the differences in P N between the two strains did not result from the difference in g s, but probably from that in light reaction system