The effect of seed priming of Purslane (Portulaca oleracea L.) with salicylate under chromium and lead contamination

Abstract

In order to investigate the effect of seed priming on the purification capacity of heavy metals chromium and lead and growth traits of purslane, an experiment was conducted at two stages of the field and the laboratory during 2017. The experimental design was conducted in a completely randomized design with 3 factors in a factorial layout with 3 replications in a pot. Treatments in the field included seed priming (by 1mM salicylic acid), non-primed seeds, and different levels of chromium (0, 25, 75, and 100 mg/kg) and lead (0, 50, 150 and 300 mg / kg). Results showed that different levels of chromium and lead had significant effects on morpho-physiological characteristics of the plants. With increasing heavy metal concentration, fresh/dry weight of root/shoot and shoot extraction significantly decreased compared to control. The highest values of fresh/dry weight of root/shoot and shoot extraction were obtained from primed seed and no heavy metals treatment while the lowest levels were obtained from the highest levels of chromium (100 mg / kg) and lead (300 mg / kg) treatments in non-primed seeds. Based on the obtained results, seed priming with salicylic acid had increasing effect on the remediation of chrome and lead elements from soil.

Keywords

• extraction
• heavy metals
• remediation
• salicylic acid