Rate of photosynthetic acclimation to fluctuating light varies widely among genotypes of wheat

摘要: Highlight Significant variation exists in the acclimation time of photosynthesis following dark-to-light transitions across wheat genotypes, under field and controlled conditions. Slow reduced daily carbon assimilation by up to 16%. Abstract Crop yield are limited slow photosynthetic induction sunflecks. We quantified kinetics diverse genotypes for first time. In a preliminary study using penultimate leaves 58 grown field, we measured maximum rate (Amax) after shift from full darkness saturating light (1700 μmol m−2 s−1) with 1-4 replicates per genotype. then grew 10 these contrasting responses environment carboxylation capacity (Vcmax) dynamic A vs ci curves low high (50 1500 s−1), 5 Within-genotype median 95% (t95) varied 8.4 23.7 min Amax field-grown leaves, 6.7 10.4 Vcmaxin chamber-grown flag leaves. Our simulations suggested that non-instantaneous reduces net gain 16%, breeding speed Vcmax slowest genotype match fastest could increase more than 4%, particularly experience predominantly short-duration