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KMID : 0578320110310060593
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Molecules and Cells
2011 Volume.31 No. 6 p.593 ~ p.601
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Arabidopsis Cell Death in Compatible and Incompatible Interactions with Alternaria brassicicola
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Mukhamad Su’udi
Kim Min-Gab
Park Sang-Ryeol
Hwang Duk-Ju
Bae Shin-Chul
Ahn Il-Pyung
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Abstract
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Two strains of necrotrophic Alternaria brassicicola, Ab40857 and Ab42464, are virulent on Korean cabbage and several wild types of Arabidopsis thaliana. Interaction between Ab42464 and Col-0 was compatible, whereas interaction between Ab40857 and Col-0 was incompatible. The loss of defense, no death (dnd) 1 function abrogated the compatibility between Ab42464 and Col-0, and the accelerated cell death (acd) 2 mutation attenuated the Col-0'sresistance against Ab40857. These two fungal strains induced PR1 transcription in Col-0. Ab40857 accelerated transcription of PDF1.2, THI2.1, CAT, and POX by 12 h compared to those challenged with Ab42464. More abun-dant cell death was observed in Col-0 infected with Ab42464, however, callose deposition was evident in the incompatible interaction. Remarkably, Ab40857-infected areas of acd2-2 underwent rampant cell death and Ab42464 triggered callose production in dnd1-1. Further-more, the incompatibility between Ab40857 and Col-0 was nullified by the coronatine- insensitive 1 (coi1) and phytoalexin-deficient 3 (pad3) mutations but not by nonexpresser of PR genes (npr1) and pad4. Ab40857 induced abundant cell death in pad3. Taken together, cell death during the early infection stage is a key determinant that discriminates between a compatible interaction and an incompatible one, and the resistance within Col-0 against Ab40857 is dependent on a defense- signaling pathway mediated by jasmonic acid and PAD3.
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KEYWORD
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necrotroph, programmed cell death
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