施氮和去除子叶对大叶桃花心木幼苗叶片硝酸还原酶活性的影响  

Effects of Nitrogen Application and Cotyledon Excision on Leaf Nitrate Reductase Activity of Swietenia macrophylla Seedling

作　　者：闫兴富[1] 田维敏[2] 

机构地区：[1]北方民族大学生命科学与工程学院,宁夏银川750021 [2]中国热带农业科学院橡胶研究所,海南儋州571737

出　　处：《亚热带植物科学》2009年第1期12-14,18,共4页Subtropical Plant Science

基　　金：国家自然科学基金(No.30460107);北方民族大学博士科研启动基金资助

摘　　要：研究了热带落叶乔木大叶桃花心木(Swietenia macrophylla)在施氮和去除子叶后幼苗叶片的硝酸还原酶活性(NRA)变化。结果表明,在非施氮(对照)条件下,NRA随着幼苗叶片的发育先升高后降低;施氮后幼苗叶片NRA在各取样时期(除35 d外)均显著高于非施氮处理(P<0.05),并随着取样时期的延续,叶片NRA逐渐降低。在幼苗发育的不同时期去除子叶,4周后,叶片NRA均显著升高(P<0.05)。Under nitrogen application and cotyledon excision, the nitrate reductase activity （NRA） of seedling leaf of Swietenia macrophylla, a tropical defoliated arbor of Meliaceae, was studied. The results showed that the leaf NRA increased first but decreased then with the development of leaves under non-nitrogen application. After nitrogen application, the leaf NRA of seedlings of all sampling periods （except 35 days after transplanting） were significantly higher （P〈0.05） than that of the control and a gradual decrease was observed during the development period of leaves. The leaf NRA of S. macrophylla seedling increased significantly （P〈0.05） after 4 weeks of cotyledon excision during different development periods.

关 键 词：大叶桃花心木 施氮 去除子叶 硝酸还原酶活性 

分 类 号：Q949.753.1[生物学—植物学] Q945.1