银合欢根瘤发育和固氮功能的关系
RELATION BETWEEN THE DEVELOPMENT OF NODULES IN LEUCAENA LEUCOCEPHALA AND THE NITROGENASE ACTIVITY
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摘要: 本文通过对银合欢[Leucaena leucocephala(Lam)de Wit]生长期间根瘤形态、组织结构的观察和固氮酶活性的测定,描述了根瘤发育过程中固氮酶活性变化及根瘤结构的基本模式。观察到根瘤外部形态由单生圆球形或圆柱状到复生的多叉结构的显著变化。讨论了根瘤顶端分生组织活动的可能调节机制、固氮功能和根瘤发育的相互关系。Abstract: This paper reports the micrographic structure and nitrogenase activity of nodules in L. leucocephala at their different stages of development. Nodules changed considerably in external shape during their growth, from sphere or column to multibranch. However, all forms of nodules had the common structure,consisting of bacteroid-containing tissues, vascular tissues, meristems and cortices. The highest nitrogenase activity, as determined by acetylene reduction assay, was observed in the mature nodules; the juvenile nodules ranked the second;and the senescent nodules followed as the last. The mature nodules contained the greatest number of bacteroids. The juvenile nodules had more bacteroids than the senescent nodules.The possible mechanism of meristematic differentiation in nodules are also discussed in this paper.
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[1] 蔡克强等,1986,银合欢功苗根瘤的固氮特性研究。植物生理学通讯3:35-37. [2] 李正理,1978,植物切片技术科学出版社,北京。
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