豆科根瘤拟菌体周膜来源和扩增方式的多样性

豆科植物根瘤内的共生拟菌体需有周膜包围。田菁［Ｓｅｓｂａｎｉａ ｃａｎｎａｂｉｎａ （Ｒｅｔｚ．） Ｐｅｒｓ．］、大豆［Ｇｌｙｃｉｎｅ ｍ ａｘ （Ｌ．） Ｍｅｒｒ．］和豌豆（Ｐｉｓｕｍ ｓａｔｉｖｕｍ Ｌ．）的根瘤拟菌体周膜内有多个拟菌体。在周膜形成和周膜内的拟菌体由１ 个到多个的根瘤发育过程中，要有大量的膜来源和周膜的扩增才能适应这种生理变化。同一种根瘤内周膜扩增有周膜间的镶嵌融合，周膜与内质网及其小泡、小液泡膜融合等多种方式。细胞化学表明：周膜、质膜和内质网膜具有相同型的ＡＴＰ酶，周膜是一种嵌合膜，与质膜、内质网膜和液泡膜有共性。最后对周膜来源和扩增方式多样性的生理意义进行了讨论

DIVERSITY OF ORIGIN AND EXPANSION MODE OF PER IBACTEROID MEMBRANE IN LEGUME NODULES

Bacteroids, in numbers of two, three or more, in the legume nodules of Sesbania cannabina (Retz.) Pers., Glycine max (L.) Merr. and Pisum sativum L. were enclosed in each peribacteroid membrane (PBM). In view that PBM was formed synchronously with the bacteroid reproduction, the origin as well as the expansion of PBM ought to be in large scale in order to meet the need of the physiologic process of symbiotic nature. It was observed that in the same nodule sample there were kinds of modes of the PBM expansion, such as chimeric fusion between, or among the PBMs in which a protrusion of one PBM fit into a depression of another PBM, fusions of the PBM with endoplasmic reticulum (ER) and its vesicles, with small vacuole membrane, etc. Cytochemical study indicated that PBM, plasma membrane, ER membrane, etc. possessed the same type of ATPase, and the PBM was structurally similar to the plasma membrane. Therefore, the PBM appears to be a mosaic membrane possessing features of the plasma membrane, ER membrane and vacuole membrane, etc. In final, the physiological significance of the diversity in the origin and expansion modes of the PBM was discussed.