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- W2189240320 abstract "Meloidogyne graminicola larvae immersed for 48 hours in 100% concentration of Paecilomyces lilacinus culture filtrate had 100% larval mortality while only 7.12% and 18.72% mortality was recorded, after 6 and 12 hours immersion, respectively. Toxic metabolites present in the culture filtrate affected the larvae as there were no galls produced in rice seedlings at 100% concentration. The culture filtrate also limited egg hatching as shown by lesser galls produced in rice seedling roots. The mycelial extract was found more potent compared with the culture filtrate extract; however, both fractions affected the larvae and eggs of M. graminicola. The dried ethyl acetate fraction gave 88.51% mortality at concentration of 500 mg/ml, followed by 76.91% at concentration of 400 mg/ml. A lethal concentration (LC) of 50% was attained at 300 mg/ml. Sixteen fractions were recovered from the crude dried extract of the fungus using vacuum liquid chromatography (VLC). Bioassay revealed that fraction 3 (combined fractions 5, 6 and 7) gave 39 percent nematode mortality suggesting that the nematoxic compounds are present in these fractions. The fragmentation pattern in GC-MS revealed that the active fraction contains more than 20 compounds with 5 major ones. The structure of the main compound was partially identified as derivative of azulene containing two unsaturation points. The limited amount of the fraction subjected to spectroscopic analysis does not warrant its purification to be able to do other analysis such as NMR spectroscopy for structure elucidation and complete compound identification." @default.
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- W2189240320 date "2011-10-03" @default.
- W2189240320 modified "2023-10-17" @default.
- W2189240320 title "Bioassay-guided Identification of the Nematicidal Secondary Metabolites from Paecilomyces lilicanus for the Control of Root-knot Nematode (Meloidogyne graminicola, Golden and Birchfield)" @default.
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- W2189240320 doi "https://doi.org/10.32945/atr3322.2011" @default.
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