CHANGES OF PHB GRANULES DURING THE BACTEROIDAL DEVELOPMENT IN ONOBRYCHIS VICIAEFOLIA NODULES
PHB颗粒在红豆草根瘤细菌发育中的动态变化

Only very few bacteria contain PHB granules in the intercellular spaces and the infection threads of Onobrychis viciaefolia nodules and usually is one in a bacterium. After the bacteria are released from their infection threads to host cells, the PHB granules disappear, The young bacteroids in infected cells do not contain PHB granule, the mature bacteroids in infected usually also do not contain PHB granule, when the bacteroids start senescence, PHB granules appear in the bacteroids again and quickly increase, sometimes they even reach to more than 20, and they can fuse each other and form some larger irregular electron transparent spaces. Then the PHB granules rapidly discrease until they completely disappear. We never find that the PHB granule appear in the disintegrated bacteroids which may be different in disintegration degrees. The changes of PHB granules during the development of the bacteroids in Onobrychis viciaefolia nodules show the PHB granules in the bacteroids are not a constant, on the contrarry, they are not noly close relation with the bacteroidal development in the nodule but also are affected by the nodule veriety.