25. アシルスペルミジン誘導体のイネ病害抵抗反応における作用と役割(口頭発表,植物化学調節学会第46回大会)

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Spermidine (Spd) is a well-known plant polyamine involved in disease resistance responses such as hypersensitive response (HR). Its N-hexanoylated derivative is reported to accumulate in plants progressively in senescing organs. However, regardless of its importance, the effect and action mechanism of Spd remains unclear. Recently we detected N-acylSpd-like compounds in Sp118 that is a disease resistance mutant identified from rice activation-tagging lines, by LC-MSMS. On the basis of this result, we synthesized several acylated Spd derivatives, examined the effect of them on cell death and disease resistance responses to reveal the role of Spd derivatives in plant. As a result, we found that non-anoylated and lauroylated Spds caused cell death in a manner different from that of Spd. Then using rice treated with these Spd derivatives we examined the expression levels of widely-used resistance marker genes, OsPR1b, PBZ1, and WRKY45, performed rice blast resistance assay, and quantified rice phytoalexines. Finally we identified ^4N-(12-hydroxylauroyl)spermidine as the most active plant activator among the acylSpds. To explore the possibility that acylSpds function as natural plant activators and induce disease resistance in rice, we analyzed acylSpds in Sp118 using LC-MSMS MRM mode. As a result, we identified two acylSpds, the content of them was far more than that in WT, respectively. This result could suggest the role of acyl Spds in disease resistance.
2011-10-03

25. アシルスペルミジン誘導体のイネ病害抵抗反応における作用と役割(口頭発表,植物化学調節学会第46回大会)

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