Abstract
Abstract Coelomic fluid (CF) of earthworms, Eudrilus eugeniae, collected by cold stress method (cold CF) was tested for its potential in different growth parameters such as seed germination, lengths of shoot, root and seedlings and vigor index in Oryza sativa L. subsp. indica. Gibberellic acid (GA) was used as a control to compare with cold CF. Rate of seed germination and length of roots were better in CF-treated seedlings. Other growth parameters were improved by CF when compared to control, but lesser or closer to the levels induced by GA. Bioassays with detached leaves from rice plants and the fungal pathogen Rhizoctonia solani revealed that the disease index was reduced in CF-treated rice plants. Liquid chromatography and mass spectrometry (LC–MS) analysis of CF suggested the presence of compounds with pesticidal, insecticidal, antifungal and plant hormone properties. Plant hormone derivative, indole-3-acetyl-L-valine, from CF of earthworms is reported here for the first time. Our results provide knowledge on developing new environmentally safe compounds to improve agriculture from organic wastes. The biological roles of metabolites in CF on growth parameters of rice and resistance towards R. solani are discussed.
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