DOI:
AUGUST 2013
Shende R.C. & Patil M.B.
ABSTRACT
Plants communicate with neighboring plants and other organisms surrounding them. Aboveground communication is articulated through stems, leaves, or flowers while belowground communication is mediated by roots. The plant root is capable of secreting chemicals into the rhizosphere through root exudates. The chemical constituents of the root exudates are characteristic of a particular plant species and also depend on the surrounding biotic and abiotic environment. Recent research suggests that the root exudates act as a sort of chemical 'language' between the secreting plant and other organisms in the rhizosphere. An experiment was conducted in axenic condition to study the effect of salt and weedicide (glyphosate) on Rhizobium sp. of Cajanus cajan plant. Total seven carbon sugars and 16 amino acids were determined from N, Ng, H & Hg plants treated with NaCl and Glyphosate. H and Hg produced highest amount of sucrose, fructose & mannose also glycine, proline and isoleucine were detected in the root exudates of H & Hg on 10th and 15th day. However it concludes that stress enhances production of sugars and amino acids in root exudates.
Keywords: Root exudates, stress, Rhizobium sp., Cajanus cajan, weedicide