title: betaC1, the pathogenicity factor of TYLCCNV, interacts with AS1 to alter leaf development and suppress selective jasmonic acid responses.
abstract: Viruses induce pathogenic symptoms on plants but the molecular basis is poorly understood. Here, we show that transgenic Arabidopsis expressing the pathogenesis protein betaC1 of Tomato yellow leaf curl China virus (TYLCCNV), a geminivirus, can phenocopy to a large extent disease symptoms of virus-infected tobacco plants in having upward curled leaves, radialized leaves with outgrowth tissues from abaxial surfaces, and sterile flowers. These morphological changes are paralleled by a reduction in miR165/166 levels and an increase in PHB and PHV transcript levels. Two factors, ASYMMETRIC LEAVES 1 (AS1) and ASYMMETRIC LEAVES 2 (AS2), are known to regulate leaf development as AS1/AS2 complex. Strikingly, betaC1 plants phenocopy plants overexpressing AS2 at the morphological and molecular level and betaC1 is able to partially complement as2 mutation. betaC1 binds directly to AS1, elicits morphological and gene expression changes dependent on AS1 but not AS2, and attenuates expression of selective jasmonic acid (JA)-responsive gene. Our results show that betaC1 forms a complex with AS1 to execute its pathogenic functions and to suppress a subset of JA responses.
authors.affiliation: Laboratory of Plant Molecular Biology, The Rockefeller University, New York, New York 10065, USA.
authors.forename: Jun-Yi
authors.initials: JY
authors.lastname: Yang
authors.forename: Mayumi
authors.initials: M
authors.lastname: Iwasaki
authors.forename: Chiyoko
authors.initials: C
authors.lastname: Machida
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Machida
authors.forename: Xueping
authors.initials: X
authors.lastname: Zhou
authors.forename: Nam-Hai
authors.initials: NH
authors.lastname: Chua
mesh_terms: D017360:Arabidopsis / Q000254:growth & development* / Q000378:metabolism / Q000821:virology*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D003517:Cyclopentanes / Q000378:metabolism*; D017791:Geminiviridae / Q000472:pathogenicity*; D009154:Mutation; D054883:Oxylipins / Q000378:metabolism*; D018515:Plant Leaves / Q000254:growth & development*; D030821:Plants, Genetically Modified; D011485:Protein Binding; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014764:Viral Proteins / Q000378:metabolism*; D014774:Virulence
chemical_list: C456239:ASYMMETRIC LEAVES1 protein, Arabidopsis; D029681:Arabidopsis Proteins; D003517:Cyclopentanes; D054883:Oxylipins; D014157:Transcription Factors; D014764:Viral Proteins; C011006:jasmonic acid
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