Abstract
Magnaporthe grisea special races 98-186-1G1 and 97-23-2D1 induce incompatible and compatible reactions respectively with rice “Xiushui”. The elicitor from the cell wall ofM. grisea race 98-186-1G1, termed IE, strongly induced the HR response in suspension cultures of rice “Xiushui”, including increased PAL activity, transcription ofpal, pr1, chi, cell death and the generation of NO. The elicitor prepared from the cell wall ofM. grisea race 97-23-2D1, named CE, was much less efficient at inducing such effects. The NOS enzyme inhibitors L-NAA and PBITU suppressed the production of NO induced by IE in “Xiushui” rice. The increased PAL activity and transcription ofpr1, pal, chi genes induced by IE were blocked by L-NAA, PBITU or CPTIO pretreatment. Direct treatment of rice cultures with the NO donor (SNP) also induced the transcription ofpr1,pal andchi genes. These data implicated that NO acted as a signal mediating the HR induced by IE in rice and showed that NO, in combination with H2O2, is necessary for induction of cell death by IE in rice suspension cells.
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