Melatonin and Nitrogen Applications Modulate Early Growth and Related Physio-biochemical Attributes in Maize Under Cd Stress
文献类型： 外文期刊
作者： Ma, Lin 1 ; Huang, Zhuoli 1 ; Li, Shuying 1 ; Ashraf, Umair 4 ; Yang, Wenjing 1 ; Liu, Hecheng 1 ; Xu, Daitianshu 1 ; Li, 1 ;
作者机构： 1.South China Agr Univ, Coll Agr, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangzhou 510642, Peoples R China
2.Guangdong Acad Agr Sci, Guangdong Prov Key Lab Crop Genet Improvement, Crop Res Inst, Guangzhou 510640, Guangdong, Peoples R China
3.China Agr Univ, Coll Agron & Biotechnol, Beijing 100000, Peoples R China
4.Univ Educ, Dept Bot, Div Sci & Technol, Lahore 54770, Punjab, Pakistan
5.Minist Agr & Rural Affairs, Sci Observing & Expt Stn Crop Cultivat South Chin, Guangzhou 510642, Peoples R China
关键词： Antioxidants; Melatonin; Nitrogen; Maize; Cadmium
期刊名称：JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：3.872； 五年影响因子：3.771 ）
ISSN： 0718-9508
年卷期：
页码：
收录情况： SCI
摘要： Melatonin is effective in modulating plant metabolism under stress conditions whereas nitrogen (N) is essential for plant growth. To explore the effects of melatonin and N applications on early growth, associated physiological and biochemical traits, and cadmium (Cd) uptake in maize under Cd stress, a pot experiment was conducted. Two melatonin levels, i.e., 0 and 200 mu M, and two N levels, i.e., 1/4 N and full N dose of Kimura nutrient solution, were employed on two widely cultivated maize varieties, i.e., Yuecainuo 2 and Yuebaitiannuo 7, under Cd stress (150 mu M). Results showed that melatonin application improved plant biomass and seedling growth, especially in low N treatment which further activated antioxidant defense system in terms of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) while melatonin application variably affected activities of antioxidants under Cd stress. In addition, melatonin application and low N treatment activated enzymes involved in N metabolism in Yuecainuo 2 as well as resulted in higher Cd concentration in shoot and root of maize seedlings in both maize varieties. Overall, short-term low N treatment showed marginal decrease in early growth of maize with higher Cd accumulation, while melatonin application could accelerate the growth of maize seedlings and further improve the Cd absorption in maize seedlings.
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