%0 Journal Article
%T Exogenous Spermidine Can Mitigate the Poison of Cadmium in Nymphoides peltatum<br>外源亚精胺可缓解荇菜镉毒害
%A 李阳
%A 施国新
%A 王红霞
%A 赵娟
%A 袁秋红
%J 植物学报
%D 2009
%I 
%X This study focused on the changes in chlorophyll content, soluble protein content, O2 .- generating rate, MDA content and activity of protective enzymes (SOD, CAT, POD) in leaves of Nymphoides peltatum under different concentrations of Cd2+ stress with 0.01 mmol.L-1 exogenous spermidine. Transmission electron microscopy revealed that Cd2+ imposed injury on the ultrastructure of chloroplasts, with swelling, breakage and disappearance of the chloroplast envelope and reduced chlorophyll content. Spermidine treatment effectively protected the ultrastructure of chloroplasts against Cd2+ stress and maintained the arrangement of thylakoids. Under single Cd2+ stress, with Cd2+ increase, chlorophyll content in N. peltatum increased then decreased quickly, whereas soluble protein content decreased gradually. The content was much higher with the addition of sprayed spermidine than with only a single Cd2+ treatment, and the trend of decrease was lower. Under single Cd2+ stress, the maximal SOD, CAT and POD content appeared at 1, 1 and 2 mg.L-1 Cd2+, respectively, and decreased gradually thereafter ; the activities of these protective enzymes were markedly increased under spermidine treatment, by 5.8%, 37.5%, and 3.3%, respectively, and therefore decreased the generation rate of reactive oxygen species such as O2 -. and MDA content.
%K <br>Cd2+
%K 荇菜
%K 亚精胺
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=97AE3D0EBF25E42C466FEF50E492F710&aid=A5A2BF45A1FD80D48ABF7A2EE4383E52&yid=DE12191FBD62783C&vid=1AE5323881A5ECDC&iid=94C357A881DFC066&sid=F16C0F639D87527E&eid=52B9DFFFCC2EB041&journal_id=1674-3466&journal_name=植物学报&referenced_num=1&reference_num=17