Osa-miR169 Negatively Regulates Rice Immunity against the Blast Fungus Magnaporthe oryzae.

ABSTRACT: miR169 is a conserved microRNA (miRNA) family involved in plant development and stress-induced responses. However, how miR169 functions in rice immunity remains unclear. Here, we show that miR169 acts as a negative regulator in rice immunity against the blast fungus Magnaporthe oryzae by repressing the expression of nuclear factor Y-A (NF-YA) genes. The accumulation of miR169 was significantly increased in a susceptible accession but slightly fluctuated in a resistant accession upon M. oryzae infection. Consistently, the transgenic lines overexpressing miR169a became hyper-susceptible to different M. oryzae strains associated with reduced expression of defense-related genes and lack of hydrogen peroxide accumulation at the infection site. Consequently, the expression o

SUBMITTER: Li Y 

PROVIDER: S-EPMC5239796 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature