关键词: 超结瘤大豆, 根瘤, 亚显微结构

Abstract: The electron-microscopic observation indicated that the uninfected cell of supernodulating soybean had an obviously enlarged nucleus. The younger bacteroid was elliptic and had a similar nucleus region in cell. The normal bacteroid had an intact membrane envelope and PHB granules. There appeared similar abnormal phenomena of ineffective nodule in infected host cell. which few bacteroids degenerated and were lytic, and there were empty membrane envelopes and bare bacteroids. The decrease of nitrogenase activity in supernodulating soybean might result from above-mentioned abnormal phenomena.

Key words: Supernodulating soybean, Nodule, Ultrastructure