Physiological impacts of gamma radiation, humic acid and silicon on coriander plant (Coriandrum sativum L.) subjected to stressful conditions

Abstract

The objected of the present work is to improve chilling and salinity stress tolerance of coriander plant (Coriandrum sativum L.) by priming the seeds in potassium silicate (80 mM), humic acid (50 mg l-1). Radiation treatment (50 Gy) was carried out using cesium-137, dose rate 0.758rad/sec. The irradiated seeds were then soaked in tap water. Untreated seeed were soaked in tap water (control). For chilling treatments, all above mentioned treatments were preserved in room temperature (20 ºC ±2) or in incubator at (6 ºC ± 0.5) for 16 h. However, in chilling stress, the seeds after treatment with silicate, HA or gamma radiation were sown in pots (30cm diameter) filled with 15 Kg clay: sand soil (2:1). Each pot contained ten seeds. The pots were divided into two groups, one of them was irrigated with tape water while, the other group irrigated 4times with 150mM NaCl at 20, 27, 34and 40 days after sowing.