Abstract
Because of its widespread consumption, bread wheat is an important cereal grain worldwide that is valued for its nutritional
and economic properties. However, the quality of wheat is affected by various stresses and environmental conditions. This
study investigated the effects of the exogenous application, in the early grain-filling stage, of different plant hormones
(3-indoleacetic acid [IAA], gibberellic acid [GA3], and 6-benzylaminopurine [6-BAP]) and distilled water as the control on
two wheat cultivars (Rijaw and Azar-2). The results showed that interaction effects of plant hormones × genotypes were
significant on gluten index, total gluten and falling number. As well, grain-filling duration was affected by plant hormone and
genotype. However, hectoliter weight was affected only by genotype. There was a positive relationship between gluten index
and grain-filling duration in both years of the experiment. Overall, the application of plant hormones can increase wheat grainfilling duration under dry-land conditions, leading to increases in total gluten and gluten index.
