Larval antibiosis to yellow stem borer, Scripophaga, incertulas (Walker), among traditional rice varieties
2019
Rillon, G.S. | Encarnacion, C.C.B. | Dela Cruz, M.B. | Santiago, G.C. | Parcada, I.G.
The Philippines is home to various kinds of microflora. A large portion of the Philippine microflora includes actinomycetes (Actinomycetales). They are Gram-negative bacteria that are prolific producers of various natural products. However, actinomycetes remain unexplored especially in the search for different insecticidal natural products. Production of natural insecticides in actinomycetes is typically low such that an effective elicitation method is required to increase in microbial production of the insecticidal compounds. One hundred fifty-six BIOTECH actinomycete strains were screened for insecticidal activity against neonate larvae of Asian corn borer (ACB), Ostrinia furnacalis (Guenee). Seven out 156 strains were found to have moderate insecticidal activity against ACB. Addition of rare earth elements (REE) Lanthanum (La) and Scandium (Sc) in culture media enhanced the insecticidal activity of three out of seven actinomycetes strains by up to two-fold. Despite the less dramatic effect of REE treatment on insecticidal activity, the appearance of potentially novel compounds in REE-treated strains might provide a new mode of action insecticide. Thus, REE proved to be an effective method in eliciting insecticidal compounds from actinomycetes.
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