Acclimation of Ecophysiological and Agronomic Traits to Increasing Growth Temperature in Three Cowpea Genotypes Grown in Anuradhapura, Sri Lanka

Figure 3

Leaf physiological traits of three cowpea genotypes grown at average daytime growth temperature, 30°C and 33°C, in Anuradhapura, Sri Lanka. (a) Light saturated net photosynthetic rate (A_sat) at ambient level of CO₂ (400 ppm) and photosynthetic photon flux density at 2200 μmol·m⁻²·s⁻¹ measured at 32°C leaf temperature in two growth seasons, (b) rate of dark respiration (R_D) measured at ambient level of CO₂ (400 ppm) and at and 32°C measurement leaf temperature in two growth seasons, (c) ratio between A_sat and R_D at 32°C measurement leaf temperature in two growth seasons, (d) ratio between gross photosynthetic rate (A_gross) and R_D at 32°C measurement leaf temperature in two growth seasons, (e) ratio between A_sat and transpiration rate at 32°C measurement leaf temperature in two seasons, and (f) ratio between A_sat and stomatal conductance () at 32°C measurement leaf temperature in two growth seasons. Whiskers around the points are the standard error of the mean.