Effect of light intensity on Sekiguchi lesion development in lesion mimic mutant of rice inoculated with Magnaporthe grisea
2006
Ueno, M.(Shimane Univ., Matsue (Japan). Faculty of Life and Environmental Science) | ; Imaoka, A. | ; Kihara, J. | ; Arase, S.
The effect of light intensity on Sekiguchi lesion formation and tryptamine accumulation involved in light-induced resistance of rice (cv. Sekiguchi-asahi) inoculated with Magnaporthe grisea was determined by using neutral density filters (ND). When the M. grisea-inoculated leaves were irradiated by ND-filtered lights from daylight fluorescent lamps, there was no difference in number of Sekiguchi lesions among attenuation rates 0, 20, 50, 75 and 90%. However Sekiguchi lesion development and tryptamine accumulation were enhanced with increasing the light intensity. In the dark condition (attenuation rate 100%), however, no Sekiguchi lesion formation and low level accumulation of tryptamine were observed. This result suggested that Sekiguchi lesion development and tryptamine accumulation were owing to photosynthesis activity and light intensity-dependently induced in Sekiguchi lesion mutant infected with M. grisea.
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