Effect of different N fertilizer forms on antioxidant capacity and grain yield of rice growing under Cd stress.
Cadmium contamination in soil has become a serious issue in sustainable agriculture production and food safety. A pot experiment was conducted to study the influence of four N fertilizer forms on grain yield, Cd concentration in plant tissues and oxidative stress under two Cd levels (0 and 100 mg Cd kg(-1)soil). The results showed that both N form and Cd stress affected grain yield, with urea-N and NH(4)(+)-N treatments having significantly higher grain yields, and Cd addition reducing yield. NO(3)(-)-N and NH(4)(+)-N treated plants had the highest and lowest Cd concentration in plant tissues, respectively. Urea-N and NH(4)(+)-N treatments had significantly higher N accumulation in plant tissues than other two N treatments. Cd addition caused a significant increase in leaf superoxide dismutase (SOD) and peroxidase (POD) activities for all N treatments, except for NO(3)(-)-N treatment, with urea-N and NH(4)(+)-N treated plants having more increase than organic-N treated ones. The results indicated that growth inhibition, yield reduction and Cd uptake of rice plants in response to Cd addition varied with the N fertilizer form.
Jalloh
Mohamed Alpha
MA
Department of Agronomy, Huajiachi Campus, Zhejiang University, Hangzhou 310029, China.
Chen
Jinghong
J
Zhen
Fanrong
F
Zhang
Guoping
G
D000975:Antioxidants / Q000378:metabolism*; D002104:Cadmium / Q000633:toxicity*; D005308:Fertilizers; D012275:Oryza / Q000254:growth & development / Q000378:metabolism* / Q000502:physiology; D010544:Peroxidases / Q000378:metabolism; D018515:Plant Leaves / Q000201:enzymology; D013312:Stress, Physiological; D013482:Superoxide Dismutase / Q000378:metabolism
D000975:Antioxidants; D005308:Fertilizers; D002104:Cadmium; D010544:Peroxidases; D013482:Superoxide Dismutase