红豆草根瘤侵染细胞的超微结构变化

ULTRASTRUCTURAL CHANGES OF THE INFECTED CELLS IN ONOBRYCHIS VICIAEFOLIA ROOT NODULES

红豆草(Onobrychis viciaefolia Scop.)是一种抗旱、耐寒、耐热和耐瘠薄的优良豆科牧草,不仅是很好的饲料和绿肥,而且还能大量结瘤固氮,提高土地肥力。因此,它在我国甘肃和其他北方干旱和半干旱贫瘠地区广为种植。虽然不少学者曾对它的引种条件、生产性能、营养成分和形态解剖作过许多研究,但对其共生固氮,特别是与共生固氮息息相关的根瘤在发育中的变化却至今尚无系统报道。因此,为了更好开发利用这一资源,

Ultrastructural changes of the infected cells and the bacteria in Onobrychis viciaejolia root nodules were observed by transmission electron microscopy.Onobrychis viciaefolia root nodu- les during their development possessed main features as follows: 1.In early developmental stages of the infected cells,there were often many small vacuoles in their cytoplasm.2.Comparing with the development of the infected cells,except some bacteria still maintained rod-shaped,other bacteria gradually become to dumbbell-shaped,even short-ch- ain-shaped,lotus-root-shaped or other shapes.These bacteria had no obvious nucleoid zones and fibrillar-shaped nucleoid material and polyphosphate granules,however,there was a kind of especial inclusion in their cytoplasm.3.The peribacteroid membranes of the bacteria often oc- curred the fusion each other.