[Effects of cadmium stress on fatty acid composition and lipid peroxidation of Malus hupehensis].
This paper studied the fatty acid composition, reactive oxygen species (ROS), lipoxygenase (LOX) activity, and malondialdehyde (MDA) content in the leaves and roots of Malus hupehensis seedlings under effects of cadmium (Cd) stress. Noticeable changes were observed in the kinds and relative contents of fatty acids after treated with CdCl2 for 7-12 hours. The relative contents of unsaturated fatty acids in leaves and roots reached the maximum after treated for 7 hours, being 82. 82% and 72. 43% , respectively. The kinds of fatty acids in leaves increased from 11 to 14 after treated for 12 hours, while those in roots increased from 4 to 6 after treated for 17 hours. The O2* generation rate and the H2O2 content reached the maximum after treated for 3 and 7 hours, respectively, and the MDA content and LOX activity increased with treating time. Cd stress altered the fatty acid composition of Malus hupehensis via the inducement of reactive oxygen species and lipoxygenase, and induced lipid peroxidation, which was caused by both ROS and LOX within the first 12 hours of CdCl2 treatment and mainly by the increase of LOX activity since then.
You
Shu-Zhen
SZ
State Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai' an, Shandong, China. shuzheny99@126.com
Yang
Hong-Qiang
HQ
Zhang
Long
L
Shao
Xiao-Jie
XJ
D002104:Cadmium / Q000633:toxicity*; D005227:Fatty Acids / Q000737:chemistry / Q000378:metabolism*; D015227:Lipid Peroxidation / Q000187:drug effects*; D008084:Lipoxygenase / Q000378:metabolism; D027845:Malus / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism*; D017382:Reactive Oxygen Species / Q000378:metabolism; D012989:Soil Pollutants / Q000633:toxicity; D013312:Stress, Physiological
D005227:Fatty Acids; D017382:Reactive Oxygen Species; D012989:Soil Pollutants; D002104:Cadmium; D008084:Lipoxygenase