Effect of exogenous treatment of hormone in reducing salinity effects on germination growth responses in spring wheat

ABSTRACT:In order to investigate effects of different concentration of gibberlic acid (GA3), kentin and Putrescine poly amine, on germination of three cultivars of wheat under salinity stress, the experiment was carried out as factorial based on completely randomized design with four replicates in laboratory of Agronomy and Plant Breeding, department of agriculture in Islamic Azad University, Varamin-Pishva branch in 2013. The first factor was four levels of salinity including S1: 3.78, S2: 5.95, S3: 10.25 and S4: 12.87 ds/m, the second factor was was six level of hormone including H0: control, H1: GA3 150 mg/L, H2: Kentin 150 mg/L, H3: GA3 150 mg/L + Kentin 150 mg/L, H4: Putrescine 2.5 mmol/L, H5: GA3 150 mg/L + Kentin 150 mg/L+ Putrescine 2.5 mmol/L. coleoptile and cleorhiza length, cleorhiza number, coleoptile, cleorhiza and seedling dry weight, Tissue water content (TWC) germination percent and number of damaged seeds were measured. Analysis of variance showed that coleoptile and cleorhiza length, cleorhiza number and TWC affected by salinity and hormone (P < 0.01). Other properties not affected by salinity and hormone. The results emphasized that these hormones and poly amine had no significant effect in reducein salinity effects in Tajan cultivar.