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.
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
