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Cotton GhBAK1 Mediates verticillium Wilt Resistance and cell death

Journal of Integrative Plant Biology 2013年第7期55卷 586-596页

作者： Xiquan Gao Fangjun Li Maoying Li Ali S.Kianinejad Jane K.Dever Terry A.Wheeler Zhaohu Li Ping He Libo Shan Department of Plant Pathology and Microbiology and Institute for Plant Genomics and BiotechnologyTexas A&M UniversityCollege Station College of Agriculture Nanjing Agricultural University College of Agronomy and Biotechnology China Agricultural University Department of Biochemistry and Biophysics and Institute for Plant Genomics and Biotechnology Texas A&M UniversityCollege Station University of Texas at Brownsville Texas A&M AgriLife Research and Extension Center

virus-induced gene silencing （VIGS） offers a powerful approach for functional analysis of individual genes by knocking down their expression. We have adopted this approach to dissect gene functions in cotton resistant to Verticfllium wilt, one of the most devastating diseases worldwide. We showed here that highly efficient VIGS was obtained in a cotton breeding line （CA4002） with partial resistance to verticillium wilt, and GhMKK2 and Gh Ve I are required for its resistance to verticillium wilt. Arabidopsis AtBAK1/SERK3, a central regulator in plant disease resistance, belongs to a subfamily of somatic embryogenesis receptor kinases （SERKs） with five members, AtSERK1 to AtSERK5. Two BAK1 orthologs and one SERK1 ortholog were identified in the cotton genome. Importantly, GhBAK1 is required for CA4002 resistance to verticillium wilt. Surprisingly, silencing of GhBAK1 is sufficient to trigger cell death accompanied with production of reactive oxygen species in cotton. This result is distinct from Arabidopsis in which AtBAK1 and AtSERK4 play redundant functions in cell death control. Apparently, cotton has only evolved SERK1 and BAK1 whereas AtSERK4/5 are newly evolved genes in Arabidopsis. Our studies indicate the functional importance of BAK1 in verticillium wilt resistance and suggest the dynamic evolution of SERK family members in different plant species.

关键词： cell death: gossvoium hirsutum: verticillium dahliae: virus-induced qene silence.

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