抄録
Effects of addition of fatty acids to culture media on the population growth of Bursaphelenchus xylophilus were examined to understand nematode feeding in the pine tree habitat rich in fatty acids. B. xylophilus was reared on Botrytis cinerea grown on fatty acids-supplemented potato dextrose agar (PDA) and unsupplemented PDA (control). Oleic acid at concentrations of 3.49, 5, 10, 20, mg per ml hydrated PDA increased the reproductive rates and the survivability of B. xylophilus. Linoleic acid affected the population of B. xylophilus only at 10 mg per ml PDA. Stearic acid enhanced the reproductive rates of B. xylophilus at 10 mg per ml PDA but had no effect on the survivability of the nematode population. Palmitic acid had no effect when added to the cultures. Addition of oleic acid or linoleic acid (10 mg/ml PDA) to unsupplemented cultures 2 weeks or one month after nematode inoculation enhanced the reproductive rates and the survivability of B. xylophilus. Addition of oleic acid to culture media did not affect the population growth of Aphelenchoides besseyi. This suggests that fatty acids have different effects on the biology of different nematode species and that oleic acid has a specific role in enhancing reproduction and survival of B. xylophilus.
