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- Title
Rate of photosynthetic induction in fluctuating light varies widely among genotypes of wheat.
- Authors
Salter, William T; Merchant, Andrew M; Richards, Richard A; Trethowan, Richard; Buckley, Thomas N
- Abstract
Crop photosynthesis and yield are limited by slow photosynthetic induction in sunflecks. We quantified variation in induction kinetics across diverse genotypes of wheat for the first time. Following a preliminary study that hinted at wide variation in induction kinetics across 58 genotypes, we grew 10 genotypes with contrasting responses in a controlled environment and quantified induction kinetics of carboxylation capacity (V cmax) from dynamic A versus c i curves after a shift from low to high light (from 50 µmol m–2 s–1 to 1500 µmol m–2 s–1), in five flag leaves per genotype. Within-genotype median time for 95% induction (t 95) of V cmax varied 1.8-fold, from 5.2 min to 9.5 min. Our simulations suggest that non-instantaneous induction reduces daily net carbon gain by up to 15%, and that breeding to speed up V cmax induction in the slowest of our 10 genotypes to match that in the fastest genotype could increase daily net carbon gain by up to 3.4%, particularly for leaves in mid-canopy positions (cumulative leaf area index ≤1.5 m2 m–2), those that experience predominantly short-duration sunflecks, and those with high photosynthetic capacities.
- Subjects
PHOTOSYNTHETIC rates; LEAF area index; GENOTYPES; WHEAT; CROP yields
- Publication
Journal of Experimental Botany, 2019, Vol 70, Issue 10, p2787
- ISSN
0022-0957
- Publication type
Article
- DOI
10.1093/jxb/erz100