Ultrastructural changes of the infected cells have been observed by transmission electron microscopy during pea root nodule senescence.The infected cells and bacteroids of pea no- dules ultimately senesce,their senescence has certain laws and features.Firstly,peribacteroid membrane were loosened,leaving a large electron-empty space with fibrillar and vesicular material.Then bacteroid cytoplasm lost features and aggregated into some clustered electron- dense material.At next stage bacteroids were structurall...
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