Abstract
Summary Using two different strains of Rhizobium from geographically separated locations (African strain ORS-571 and the Indian strain WE7), we have demonstrated both root and stem nodulation when associated symbiotically with the tropical legume Sesbania rostrata. Both these strains are able to form effective nodules by two different modes of infection in the two locations of nodulation. On the roots the infection occurs by root hair curling whereas stem modulation occurs at the site of emerging adventitious roots via a form of crack entry. Infection thread formation is observed at both of these sites. The major difference between root and stem nodulation in this legume is that in the development of nodulation, meristematic activity is initiated in the root tissue whereas on-the stems there is a takeover of the pre-existing meristematic tissue at the site of the adventitious roots.
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