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Factors Affecting Sporulation of a Mycoherbicide, Epicoccosorus nematosporus, on the Lesion of Eleocharis kuroguwai

  • Hong, Yeon-Kyu (Plant Environment Division, National Yeongnam Agricultural Experiment station, Rural Development Administration) ;
  • Hyun, Jong-Nae (Plant Environment Division, National Yeongnam Agricultural Experiment station, Rural Development Administration) ;
  • Cho, Jae-Min (Plant Environment Division, National Yeongnam Agricultural Experiment station, Rural Development Administration) ;
  • Uhm, Jae-Youl (Agricultural Biology Division, Kyungpook National University) ;
  • Kim, Soon-Chul (Plant Environment Division, National Yeongnam Agricultural Experiment station, Rural Development Administration)
  • Published : 2002.04.01

Abstract

Effects of temperature and dew period on sporulation of a mycoherbicide, Epicoccosorus nematosporus, on the lesion of its host, Eleocharis kuroguwai were determined. Conidia formation was first observed after 10 days on plants incubated for either 12 or 16 h in a dew chamber at 28$^{\circ}C$; 16 h dew period resulted in more conidia formation. As the dew period was decreased to less than 8 h, fewer conidia formed. Conidial production was most abundant at 28$^{\circ}C$ and produced as much as 3.3$\times$10$^4$conidia per lesion, while 0.1$\times$10$^3$and 2.3$\times$10$^3$conidia per lesion were produced at 16$^{\circ}C$ and 36$^{\circ}C$, respectively. Alternating temperature regimes, i.e., 30/15, 30/20, 28/20, and 28/15$^{\circ}C$ (day/night) were much better than constant temperature, i.e., 30/30, 28/28/, and 20/2$0^{\circ}C$ for sporulation. In the second sporulation, there were as much as 3.1$\times$10$^4$conidia per lesion (ca. <50% of the first sporulation). Then, sporulation dropped sharply to 6.2$\times$10$^2$conidia per lesion in the third sporulation. Results of this study suggest that temperature combined with dew period is the primary limiting factor in the use of E. nematosporus as a mycoherbicide off, kuroguwai.

Keywords

References

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