PJB-2019-281
Antagonism of Pythium and Penicillium Eu0013 Extracts Against the Asphodelus tenuifolius cav. (Wild Onion) - Chickpea Weed
Nadia khan
Abstract
Utilization of secondary metabolites as bio-herbicidal constituents for weed management is an important approach in interdisciplinary study of weed science and agricultural chemistry. To investigate herbicidal potential, culture filtrate and mycelial extracts of Pythium sp. and Penicillium sp. were analyzed for germination and growth inhibition of Asphodelus tenuifolius and chickpea seeds. Fungal extractpotency was compared with the commercial herbicide, pendimethalin and negative control. Results showed that Pythium culture filtrate inhibited 61-76% growth of A. tenuifolius with no significant side-effect on chickpea seed germination and growth. Organic cell extract obtained from Pythium showed 100% inhibition on germination and growth of A. tenuifolius. However, toxicity of cell extracts (17-41% and 33-48%) was also observed on germination and growth of chickpea seeds. Penicillium extracts exhibited synergistic effect on growth and germination of wild onion and chickpea seeds. The germination inhibition in positive control for A. tenuifolius was 45-50% and growth inhibition was 90-100%. High pressure liquid chromatography (HPLC) analysis of the fungal extracts displayed various metabolites, characterized by their retention time and UV spectra. The study concluded that crude extract from Pythium sp. possess a potent inhibitory effect against seed germination and growth of A. tenuifolius and hence, propose for further analysis with low concentrations to avoid inhibition in chickpea seeds.
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