摘要:為深入了解硒對富硒植物生長發(fā)育的促進(jìn)作用,探討了水培營養(yǎng)液中不同亞硒酸鈉質(zhì)量濃度對恩施碎米薺(Cardamine enshiensis T. Y. Xiang & Y. Y. Wu)幼苗葉片的光合色素、還原型谷胱甘肽(GSH)、維生素C(VC)以及葉片中脂質(zhì)過氧化產(chǎn)物丙二醛(MDA)含量的影響。結(jié)果表明,硒的質(zhì)量濃度在30~90 mg/L時,可以促進(jìn)恩施碎米薺葉片葉綠素b的合成;而且葉片中GSH和VC的含量有顯著增加,并在45 mg/L時達(dá)到最大值;在30~60 mg/L時,葉片中的MDA生成顯著減少。可見,適量的硒可以提高恩施碎米薺葉片的光合效率,促進(jìn)抗氧化物的生成,抑制脂質(zhì)過氧化反應(yīng)。
關(guān)鍵詞:恩施碎米薺;硒;光合色素;谷胱甘肽;維生素C;丙二醛
中圖分類號:Q949.748.3;O613.52;Q945.1 文獻(xiàn)標(biāo)識碼:A 文章編號:0439-8114(2011)24-5157-03
Effect of Selenium on the Photosynthesis and Nonenzymatic Antioxidants in
Cardamine enshiensis Leaves
LEI Hong-ling1,WU Jin-long2
(1. Key Laboratory of Biological Resources Protection and Utilization of Hubei Province, Hubei University for Nationalities, Enshi 445000, Hubei, China; 2. Tsingtao Brewery [Taizhou] Co.,Ltd., Taizhou, 318000, Zhejiang, China)
Abstract: The effect of different Na2SeO3 concentrations on the photosynthetic pigments, nonenzymatic antioxidants such as GSH and VC in Cardamine enshiensis T. Y. Xiang & Y. Y. Wu seedling leaves was studied. The results showed that the synthesis of Chlorophyll b was improved at the Se concentration of 30~90 mg/L, the contents of GSH and VC were increased at the Se concentration of 30~90 mg/L, and reached to peak value at the Se concentration of 45 mg/L, the generation of MDA was significantly decreased at the Se concentration of 30~60 mg/L. The above showed that the proper Se concentration could improve the photosynthetic efficiency, increase the content of antioxidants and inhibit lipid peroxidation in C. enshiensis leaves.
Key words: Cardamine enshiensis T. Y. Xiang & Y. Y. Wu; selenium; photosynthetic pigment; GSH; VC; MDA
硒是植物生長的有益元素,低濃度的硒可以促進(jìn)植物的光合作用[1]、提高植物的抗氧化能力[2-4],并與植物的抗衰老[5,6]、抗逆境脅迫[7,8]等密切相關(guān)。而對于富硒植物來說,硒則是其必需元素[9],可以促進(jìn)富硒植物葉片中有效成分的合成[10],通過增強抗氧化酶活性而提高富硒植物的抗氧化能力[11]。試驗在前期研究[10,11]的基礎(chǔ)上,進(jìn)一步探討硒對恩施市高硒區(qū)生長的超富硒植物恩施碎米薺(Cardamine enshiensis T. Y. Xiang & Y. Y. Wu)葉片的光合色素及非酶抗氧化物如還原型谷胱甘肽(GSH)、維生素C(VC)等的影響,為進(jìn)一步了解硒對富硒植物生長發(fā)育的促進(jìn)機制提供依據(jù)。
1 材料與方法
1.1 材料及處理
取生長在高硒區(qū)(湖北省恩施市雙河鄉(xiāng)魚塘壩)的恩施碎米薺種子,萌發(fā)后在植物培養(yǎng)室中進(jìn)行液體培養(yǎng)[10],待長成一定大小的幼苗后,用含亞硒酸鈉0、15、30、45、60、75、90 mg/L 7個質(zhì)量濃度處理的營養(yǎng)液培養(yǎng)一個月,采集各處理的葉片,用于各項生理生化指標(biāo)的測定。……