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作 者 ：吴以德,黄维南,卓仁松

期 刊 ：核农学报 1988年 2卷 03期 页码：184-192

关键词：根瘤菌类菌体周膜；融合与解离；金合欢根瘤；

Keywords:rhizobium sp, peribacteroid membarane, fusion and disintegration, acacia root nodule,

摘 要 ：厦门红壤地区生长的热带豆科树种,苏门答腊金合欢(Acacia glauca(L.)Moench)和有刺金合欢(Acacia farnesiana willd)其根瘤中的根瘤菌(Rhizobium SP.)类菌体周膜具有融合作用,分为五个阶段进行,先是相邻膜间发生对位相嵌,接着两膜紧密贴近出现融合,由于中间部分的膜进行穿通融合,就成为哑铃状的融合体,最后发展成为一个含有多个类菌体的近球状的新生融合体系。衰老阶段时,此周膜出现解离,不再包裹类菌体,共生细胞的结构体系崩溃,固氮的功能也随之丧失。

Abstract:The fusion of peribacteroid membranes in the root nodules of Acacia glauca (L.)Meench and Acacia farbesiana Willd was investigated. Five sequential changing stages corresponding to their respective morphological characteristics were found.At first mosaic formation appeared between the two neighboring membranes.Then the two membranes intimately approached.Next came the fusion and penetration at the middle part of the membranes.Fourthly, the connection formed a dumbbell fusion body.Finally, a big,almost globular new fusion body appeared. After the transfer of well developed bacteroids, new distribution of aggregated bacteroids quickly increased. Later on, degradation of senescent peribactroid membranes started and led to the disintegration of the symbiotic cellular structures. As a result, the n‘odulcs lost the ability of nitrogen fixation.The results of electron microscopic scanning show that the fusion and degradation of perimembrancs affected the structures and functions of the symbiotic nitrogen fixation.

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