Abstract
SummaryThe Elaeagnus angustifolia, L. root nodules have been observed for an year. The endophyte is present under several forms in the modified cortical cells. In Spring (April-May) filaments, vesicles an «bacterial forms» are visible in parenchymatous cells which are hypertrophied and caracterized by: large vacuoles, hypertrophied and lobed nucleus, very enlarged vesicular, rough endoplasmic reticulum (R.E.R.) profils and the loss of starch. Then, from May to October, the vesicular differenciation is mainly marked by septums and striated bodies apparition. The dense electron granules disappear from filaments and vesicles. In the host-cell cytoplasm we observe an increase in mitochondrial number. In October, pluricellular, pregranular and granular cordiform-like-elements appear in the infected-cells by filament differenciation. During Winter altered filaments and vesicles are accompagnied by falcated elements. The host-cell-cytoplasm is first preserved and then degenerates.
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