Angiosperm Flora of India

Transcript-Based Cloning of RRP46, a Regulator of rRNA Processing and R Gene-Independent Cell Death in Barley-Powdery Mildew Interactions

Publication Type:Journal Article
Year of Publication:2009
Authors:Xi, L, Moscou, MJ, Meng, Y, Xu, W, Caldo, RA, Shaver, M, Nettleton, D, Wise, RP
Journal:The Plant Cell
Date Published:2009
ISBN Number:10404651
Keywords:Hordeum, Hordeum vulgare, Oryza, Oryza sativa

Programmed cell death (PCD) plays a pivotal role in plant development and defense. To investigate the interaction between PCD and R gene-mediated defense, we used the 22K Barley1 GeneChip to compare and contrast time-course expression profiles of Blumeria graminis f. sp hordei (Bgh) challenged barley (Hordeum vulgare) cultivar C. I. 16151 (harboring the Mla6 powdery mildew resistance allele) and its fast neutron-derived Bgh-induced tip cell death1 mutant, bcd1. Mixed linear model analysis identified genes associated with the cell death phenotype as opposed to R gene-mediated resistance. Onehundred fifty genes were found at the threshold P value < 0.0001 and a false discovery rate < 0.6%. Of these, 124 were constitutively overexpressed in the bcd1 mutant. Gene Ontology and rice (Oryza sativa) alignment-based annotation indicated that 68 of the 124 overexpressed genes encode ribosomal proteins. A deletion harboring six genes on chromosome 5H cosegregates with bcd1-specified cell death and is associated with misprocessing of rRNAs but segregates independent of R gene-mediated resistance. Barley stripe mosaic virus-induced gene silencing of one of the six deleted genes, RRP46 (rRNA-processing protein 46), phenocopied bcd1蚪mediated tip cell death. These findings suggest that RRP46, a critical component of the exosome core, mediates RNA processing and degradation involved in cell death initiation as a result of attempted penetration by Bgh during the barley-powdery mildew interaction but is independent of gene-for-gene resistance.

Short Title:The Plant Cell
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