Assessment of assimilate remobilization and current photosynthesis of bread wheat genotypes in grain filling under rainfed and supplemental irrigated conditions

The object of this study was the assessment of assimilate remobilization (AR) in different bread wheat (Triticum aestivum L.) genotypes under rainfed (Rf) and supplemental irrigation conditions (SupIr). For this purpose, 44 winter wheat genotypes were evaluated in a lattice design arrangement (7×7) with two replications in both conditions during the 2018-2020 cropping seasons in the Dryland Agricultural Research Institute (DARI), Maragheh Iran. Results indicated significant year × genotypes interaction effects among the genotypes for grain yield (GY), current photosynthesis rate (CPhR) and photosynthesis efficiency (PhE), AR and assimilate remobilization efficiency (ARE), and AR contribution (P < 0.01). In the first year, maximum GY belonged to genotype 4 (2462 kg ha-1) and genotype 33 (4234 kg ha-1) in Rf, and SupIr conditions, respectively. For CPhR, genotypes 33 (439.05 mg plant-1) and 26 (196.300 mg plant-1) indicated the maximum value in the SupIr, and Rf conditions, respectively. For PhE, genotypes 33 (42.950 mg plant-1), and 21 (17.950 gr gr-1) showed the highest value in the SupIr, and Rf conditions, respectively. Genotypes indicated significant differences in AR contribution (P < 0.01). The highest value for AR contribution (248.200 mg plant-1) was observed for genotype 8 in SupIr, and genotype 4 (201.60 mg plant-1) in Rf conditions. For ARE, genotypes 4 and 8 indicated the maximum value and for AR contribution, genotypes 12 and 8 showed the highest value under the Rf, and SupIr conditions, respectively