The germination response of purslane seeds from parental plants fed with different sources fertilizer to cadmium toxicity

Soil and water resources pollution with heavy metal such as cadmium reduced their germination and growth. Appropriate parental plant nutritional plays a major role in the creation of seeds with better ability germination. The germination response of parental plants seed treated with different sources fertilizer to cadmium toxicity was evaluated as factorial experiment in completely randomized design with four replications. The treatments were consisted of three levels of seed produced from grown parental plant under different nutritions (Broiler litter, chemicals fertilizer, no fertilizer amendment) and four concentrations of cadmium (20, 40, 60 and 80 mg/L Cd) plus control. In this experiments germination percentage and rate, shoot length, root length, shoot dry weight, root dry weight and seed vigor index were investigated.The results showed that with increasing concentrations of cadmium, indices of germination were reduced in fertilizer treatments. Broiler litter treatment was considered as best treatment to improve all germination parameters. Germination percentage in broiler litter did not follow a specific trend and germination rate coefficient only for chemical fertilizer had a significant regression equation. But shoot length, radicle length, radicle dry weight and seed vigor, decreased in the form of quadratic trends. Shoot dry weight was only reduced in the form of quadratic trend in the chemical fertilizer. Radicle length was the most sensitive parameter to cadmium toxicity in comparison with other parameters, because it was decreased in comparison with all treatments, with a slope steeper. In summary, It can be concluded the quality of seeds fed with organic fertilizer is more than the chemical fertilizers for grow in soils with higher risk of cadmium contamination, which its show the superiority of seed production in organic conditions.