[Effect of different zinc levels on accumulation and chemical forms of cadmium, and physiological characterization in Capsicum annuum L].
Pot experiments were carried out to investigate the influence of different zinc (Zn) levels (0, 100, 200, 400 and 600 micromol x L(-1)) on the plant growth,activities of antioxidant enzymes, contents of chlorophyll a and b, accumulation and chemical forms of cadmium (Cd) in Capsicum annuum L. when exposed to Cd (20 mg x kg(-1)). The results showed that dry weights of leaf, stem, fruit and root, and contents of chlorophyll a and b in Capsicum annuum L. were increased by Zn ( < or = 400 micromol x L(-1)), while inhibited by high Zn (600 micromol x L(-1)). Activities of superoxide dismutase (SOD) and catalase (CAT) were reduced by Zn ( < or =400 micromol x L(-1)), the lowest activities of SOD and CAT were recorded in 400 micromol x L(-1) Zn, but activities of SOD and CAT were increased when Zn >400 micromol x L(-1). Cadmium concentrations in stem, fruit and root of Capsicum annuum L. were decreased by 2.7%-5.4%, 7.5%-28.1% and 7.6%-21.8% in the presence of Zn when exposed to Cd. The total extractable Cd, NaCl- extractable Cd, water-extractable Cd and ethanol-extractable Cd in fruit were reduced by 7.7%-21.8%, 4.11%-23.6%, 54.5%-66.8% and 4.8%-86.7% in the presence of Zn,while acetic acid- extractable Cd and residual Cd were increased by 28.0%-68.0% and 12.6%-25.0%.
Chen
Gui-qing
GQ
College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China. chenguiqing3807@sina.com
Zhang
Xiao-jing
XJ
Xu
Wei-Hong
WH
Liu
Ji-zhen
JZ
Wang
Hui-xian
HX
Guo
Liu-ming
LM
Chen
Lu-hao
LH
Zhang
Hai-bo
HB
Lan
Chun-tao
CT
Zeng
Hong-jun
HJ
Xiong
Zhi-ting
ZT
D000042:Absorption; D002104:Cadmium / Q000037:antagonists & inhibitors* / Q000378:metabolism*; D002212:Capsicum / Q000254:growth & development / Q000378:metabolism* / Q000502:physiology; D004785:Environmental Pollutants / Q000037:antagonists & inhibitors / Q000378:metabolism; D015032:Zinc / Q000494:pharmacology*
D004785:Environmental Pollutants; D002104:Cadmium; D015032:Zinc