Abstract
Polyamines are involved not only in fundamental cellular processes such as growth, differentiation, and morphogenesis, but also in various environmental stresses. We demonstrated that spermidine, a polyamine, confers resistance to rice blast accompanied by the up-regulation of marker genes for the salicylic acid-mediated signaling pathway
PR1b
and
PBZ1
and of phytoalexin biosynthesis genes
CPS4
and
NOMT
. This is the first report about the involvement of spermidine in rice disease resistance.