THE EFFECTS OF FOLIAR APPLICATION OF ABA AND CYTOKININE IN DIFFERENT REPRODUCTIVE GROWTH STAGES OF MATERNAL WHEAT PLANTS ON THE SEED TRAITS UNDER SALINE CONDITIONS

In order to study the effects of foliar sprays of Cytokinine (CK) and Abscisic Acid (ABA) in different reproductive growth stages of maternal plant on the seed characteristics under laboratory saline conditions a factorial experiment arranged in RCBD with three replications and two factors was conducted in Agricultural Faculty of Mahabad Azad University. Factor A included three salinity stress levels (0, 0.4 and 0.8 ds/m) and factor B included seven levels; b1: no spray of hormones as control, b2: CK foliar spray in pollination stage, b3: CK and ABA foliar sprays in grain filling and pollination stages, b4: CK foliar spray in grain filling and pollination stages, b5: ABA foliar spray in pollination stage, b6: ABA foliar spray in grain filling and pollination stages, b7: CK and ABA foliar sprays in pollination stages. Results showed that with increasing salinity rate all of the studied traits decreased significantly so that the least germination velocity, rootlet dry weight and rootlet length were obtained from the salinity stress of 0.8 ds/m and their greatest amounts were obtained from the control. The interaction of salinity and plant growth regulators with dry weight and stemlet length was significant. With increasing the salinity percentage at various levels of hormones the stemlet length and dry weight decreased so that the least values were obtained from ABA foliar spray at pollination and grain filling with salinity stress of 0.8 ds/m. The greatest values were obtained from the foliar spray of CK at pollination and grain filling with distilled water (control). The results showed that CK foliar spray at pollination and grain filling had the greatest positive effect on seed vigority under saline conditions.