Abstract
When plants interact with pathogens, they protect themselves with various chemical and physical barriers. Some barriers, such as phytoalexin production, are induced by molecules called elicitors that are produced by pathogens. Although bioassays for measuring elicitor activity in suspension-cultured rice cells have been established, a bioassay for measuring elicitor activity in rice plants has been lacking. Phytoalexin accumulation in rice leaves in response to elicitor treatment is highly dependent on environmental conditions, establishing the right combination of conditions has been difficult. We have succeeded in developing a new bioassay by cultivating rice plants under conditions of low temperature (22°C), high light intensity (30, 000lux) and high humidity (80%). When the fifth leaves of rice plants cultivated under these conditions were fully expanded, the treatment of the fourth leaves with mycelial extracts of Magnaporthe grisea or Phytophthora infestans induced the accumulation of the rice phytoalexins, momilactones and phytocassanes.
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