Evaluation of relationships between chemical and biochemical traits with grain yield of rice genotypes through stepwise regression model in northern Khouzestan province

This study aims to identify relationships as well as the positive and negative influence of the related traits to the sugar of organs and different periods of growth, ion, biochemistry, enzyme and hormone as the independent variable with the grain yield as the dependent variable. Twelve genotypes were carried out in the random complete blocks’ design with three replications that were consistent with the climate conditions of Khuzestan. They can impact significantly on the grain yield changes in the sugar of the vegetative, reproductive organs at the stage of physiological maturity of the flag leaf and root, in the pollination stage, in the nitrogen ions, in the biochemical traits of the Malondialdehyde, protein, starch and proline attributes and between the abscisic acid enzyme and hormone, Catalase and Guaiacol. The sugar in the flag leaf had the highest percentage of significant change in the level of 1% with the yield grain at the physiological maturity stage, nitrogen, Malondialdehyde (MDA) and abscisic acid, with negative, positive, negative and negative relation, respectively. The obtained results can be the major and important target for genetic modification of the rice varieties to increase the grain yield of the plant as an economic and strategic product.