Abstract
Green manuring especially in rice wheat cropping systems of many tropical and subtropical countries is regaining importance due to increased fertilizer costs and environmental considerations. Many species of Sesbania genus have been reported as potential green manure crops. The genus is not well characterized and there is a lot of ambiguity over the nomenclature and classification of the species of this genus. A pilot study based on agro-morphological and molecular data was conducted to examine the interspecific and intraspecific variability in the selected species of Sesbania genus that were collected from diverse geographical locations and are recommended or traditionally used as green manures. The study revealed a lot interspecific variability at both morphological and molecular level. It was also shown that species-specific genetic markers could be generated. The potential use of such markers in Sesbania breeding program is discussed. The study also emphasizes the utilization of molecular profiling for proper identification and classification of the species of this genus. In addition, various limitations in breeding and utilization of Sesbania as a green manure crop and the potential of a radiation induced late flowering mutant (Trombay Sesbania rostrata-1; TSR-1) for crop improvement is also discussed.
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