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Rice NH1 (NPR1 homolog 1) is a key mediator of innate immunity. In both plants and animals, the innate immune response is often accompanied by rapid cell death at the site of pathogen infection. Over-expression of NH1 in rice results in resistance to the bacterial pathogen,  Xanthomonas oryzae  pv.  oryzae  ( Xoo ), constitutive expression of defense related genes and enhanced benzothiadiazole (BTH)- mediated cell death. Here we describe a forward genetic screen that identified a  s uppressor of  N H1-mediated  l esion formation and resistance,  snl6 . Comparative genome hybridization and fine mapping rapidly identified the genomic location of the  Snl6  gene.  Snl6  is a member of the cinnamoyl-CoA reductase (CCR)-like gene family. We show that  Snl6  is required for NH1-mediated resistance to  Xoo . Further, we show that  Snl6  is required for pathogenesis-related gene expression. In contrast to previously described CCR family members, disruption of  Snl6  does not result in an obvious morphologic phenotype.  Snl6  mutants have reduced lignin content and increased sugar extractability, an important trait for the production of cellulosic biofuels. These results suggest the existence of a conserved group of CCR-like genes involved in the defense response, and with the potential to alter lignin content without affecting development.

Rice Snl6, a Cinnamoyl-CoA Reductase-Like Gene Family Member, Is Required for NH1-Mediated Immunity to Xanthomonas oryzae pv. oryzae