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Contribution to the studies on root nodules in some leguminous weeds



Contribution to the studies on root nodules in some leguminous weeds



Phytomorphology 36(3-4): 251-256



The structure and development of root nodules of Tephrosia apollinea, Lathyrus aphaca, L. sativus and Erythrina suberosa ahve been studied. The rhizobia enter through the root hairs and form one or two unbranched infection threads. In T. apollinea and E. suberosa the infected root hair enlarges three or more times its original size. The infection thread bears blister-like swellings on its surface. The nodule growth is by its meristem; its cortex is homogeneous and parenchymatous except in E. suberosa which has a middle layer of cells filled with tannin like substances. The nodule vascular supply consists of two traces originating from protoxylem points of the root stele at different levels. The number of vascular bundles that surround the bacteroid tissue is variable. The vascular bundles are inversely collateral in L. aphaca and L. sativus; bicollateral and amphicribral or collateral in E. suberosa. The amount of infected cells in the bacteroid zone is also variable. The process of degeneration starts from the base upwards leaving the absorption spots. Instances of a bunch of nodules around or opposite each other on either side of root in L. sativus and E. suberosa, and initiation of nodule by two juxtaposed infected root hairs and at more than one locus of infection in E. suberosa are noteworthy.

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