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Rice Defense Mechanisms Against Cochliobolus miyabeanus
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 Authours
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Il-Pyung Ahn, Soonok Kim, Seogchan Kang, Seok-Cheol Suh, and Yong-Hwan Lee |
| Title |
Rice Defense Mechanisms Against Cochliobolus miyabeanus |
| Journal |
Phytopathlogy, 2005 (95) ~ |
Abstract
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Responses of rice to Magnaporthe grisea and Cochliobolus miyabeanus
were compared. In Tetep, a rice cultivar resistant to both fungi,
pathogen inoculation rapidly triggered the hypersensitive reaction (HR),
resulting in microscopic cell death. In rice cv. Nakdong, susceptible to
both pathogens, M. grisea did not cause HR, whereas C. miyabeanus
caused rapid cell death similar to that associated with HR, which
appeared similar to that observed in cv. Tetep, yet failed to block fungal
ramification. Treatment with conidial germination fluid (CGF) from
C. miyabeanus induced rapid cell death in both cultivars, suggesting the
presence of phytotoxins in CGF. Pretreatment of cv. Nakdong with CGF
significantly increased resistance to M. grisea, while the same treatment
was ineffective against C. miyabeanus. Similarly, in cv. Nakdong, benzothiadiazole
(BTH) significantly increased resistance to M. grisea, but was
ineffective against C. miyabeanus. Methyl jasmonate (MeJA) treatment
appeared to be ineffective against either fungus. Increased resistance of
cv. Nakdong to M. grisea by BTH or CCF treatment was correlated with
more rapid induction of three monitored PR genes. Application of MeJA
resulted in the expression of JAmyb in cv. Nakdong being induced faster
than in untreated plants in response to M. grisea infection. In contrast, the
expression pattern of the PR and JAmyb genes in response to C. miyabeanus
was nearly identical between cvs. Nakdong and Tetep, and neither
BTH nor MeJA treatment significantly modified their expression patterns
in response to C. miyabeanus infection. Our results suggest that rice
employs distinct mechanisms for its defense against M. grisea versus
C. miyabeanus. |
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