Effects Of Sulfur And Selenium Treatment On Plant Growth And Some Physiological Characteristics Of Rice Under Cadmium Stress

Rice as main food in Asia areas plays an important role in daily agricultural production of human being. However, with the industrial development, environmental pollution is being more and more serious, such as heavy metals (especially cadmium) pollution. Cadmium, a non-nutrients element, has significant toxic effects on plant, which will endanger man's health through the food chain. How to ease or inhibit the cadmium poisoning in plant, has attracted widespread attention.To better understand the interactions between sulfate and selenium in plant response to cadmium stress, changes in plant growth and the content of non-protein thiols (NPT, GSH, PC) were investigated in No.6 Huai rice seedlings grown hydroponically with Cd, with or without applications of sulfate and selenium. Results of the study are as followed:(1) The inhibition effects on different parts of rice are various. Results indicated that the inhibition of Cd on the root length was significantly greater than the inhibition of stem length;(2) In the absence of Se treatment, Cd toxicity on the growth of rice seedlings increased with the enhancement of Cd content in plant. The addition of Se treatment could significantly increased the plant growth;(3) In the Cd, Se and S combination experiments, Cd toxicity to rice seedlings reduced with alleviation content of S in plant. However, A combination of Se(5 mg·L-1)-S(720 mg·L-1) treatment led to a decrease of rice plants mass;(4) High concentrations of S treatment can inhibit the absorption of Se in rice seedlings;(5) The content of non-protein thiols in rice seedlings fist increased and then decreased during the exposure time. In the Cd, Se and S combination experiments, the contents of GSH and PCs enhanced with low concentration of S addition in plant, which promoted the complexation between Cd and non-protein thiols for decreasing the Cd toxicity in rice growth.