Effect of salinity and gibberlic acid on morphologicaand physiological characterizations of three cultivars of spring wheat

ABSTRACT: In order to investigate the effects of salinity and gibberlic acid (GA) on morphological and physiological characterizations of three cultivars of spring wheat, the experiment carried out as factorial based on complete design with four replicates in Agriculture department of Islamic Azad University, Varamin- Pishva Branch in 2011. The first factor was salinity stress with four levels (3.87, 5.95, 19.25 and 12.87 ds/m) which obtained from Gom wells. The second factor was hormone (GA 150 mg/l). Number of leaves, stalk and root length, chlorophyll and proline content were measured. Analysis of variance showed the significance of salinity and cultivar at 1% of probability level. The results indicated that there was significant difference between salinity× cultivar treatments for stalk length and chlorophyll content. Mean comparison of salinity× cultivar treatments showed decrease of number of leaves, root and stalk length and chlorophyll content following increase of salinity. The free proline of leaves increased following salinity. Analysis of variance of data on maturation and application of GA treatment showed significant difference of salinity, cultivar and hormone in all traits except seed yield at 1% of probability level. There were no significant different between salinity× hormone and salinity× hormone× cultivar treatments. Mean comparison of treatments showed that increase of salinity, regardless of cultivar, reduced yield and its components severely and application of hormone was not diagnostic for that.