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PJB-1977-6
K contribution to the hitology of root nodules of sesbania sesban L
Abstract
Rhizobia entered the root via root hairs and formed infection threads . the nodules were exogenous in origin. A mature nodule consisted of four regions . namely apical meristem, bacteroid region, vascular region ans nodule cortex. The vascular supply of the nodule consisted of 1-2 strands which branched and enriched the bacteroid zone as a skeletal mantle. The vascular bundles were amphicribral. The cortex of 8 weeks old nodules showed a layer of sclereids with heavily lignified walls. Degeneration of the nodule occurred due to the formation of a layer of suberized cells and appearance of tannin bodies at the base of the nodule.
