肯氏相思根瘤亚显微结构观察

肯氏相思根瘤亚显微结构观察结果表明：刚受侵染的寄主细胞的细胞核和质体膨大，线粒体内嵴消失成为圆球状体，内质网膜松散；幼年类菌体细胞外型较小，呈圆形和椭圆形，细胞质浓密，染色深而均匀；成熟类菌体外型较大，形态多样，细胞内聚-β-羟基丁酸（PHB）累积增多；随着根瘤细胞逐渐发育成熟，在类菌体包被内可允1至数个类菌体；在根瘤衰老细胞中，类菌体包被周膜解离破裂，流出电子透明物质。本文还对周膜扩增的问题进行了讨论。

Ultrastructure of Acacia cunninghamia Nodules

The observation on ultrastructure of Acacia cunninghamia nodules showed that nucleus and plastids expanded, the crista of mitochondria disappeared and changed into transparent sphere, and ER membrane loose in the infected host cells. The young bacteroid was small, round or elliptic, and its cytoplasm was dense, deep-dyed and well distributed; the mature bacteroid was large, its morphotypes were diversity, and the accumulated PHB increased in the bacteroids. One or more bacteroids were found in each peribacteroids membrane with the gradually maturing of nodule cells. It was observed that bacteroid was broken and it effused electron-transparent substance (PHB) in old nodule cell. The source of peribacteroids membrane is also discussed.