A constitutive shade-avoidance mutant implicates TIR-NBS-LRR proteins in Arabidopsis photomorphogenic development

被引:78
作者
Faigon-Soverna, Ana
Harmon, Franklin G.
Storani, Leonardo
Karayekov, Elizabeth
Staneloni, Roberto J.
Gassmann, Walter
Mas, Paloma
Casal, Jorge J.
Kay, Steve A.
Yanovsky, Marcelo J. [1 ]
机构
[1] Univ Buenos Aires, Fac Agron, IFEVA, Consejo Nacl Invest Cient & Tecn, RA-1417 Buenos Aires, DF, Argentina
[2] Scripps Res Inst, Dept Cell Biol, La Jolla, CA 92037 USA
[3] Scripps Res Inst, Inst Childhood & Neglected Dis, La Jolla, CA 92037 USA
[4] Fdn Inst Leloir, Inst Invest Bioquim, RA-1405 Buenos Aires, DF, Argentina
[5] Univ Missouri, Div Plant Sci, Columbia, MO 65211 USA
[6] Consorci Consejo Super Invest Cientif, Inst Recerca & Tecnol Agroalimentaries, Lab Genet Mol Vegetal, Inst Biol Mol Barcelona Jordi Girona, Barcelona 08034, Spain
关键词
D O I
10.1105/tpc.105.038810
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
In plants, light signals caused by the presence of neighbors accelerate stem growth and flowering and induce a more erect position of the leaves, a developmental strategy known as shade-avoidance syndrome. In addition, mutations in the photo-receptors that mediate shade-avoidance responses enhance disease susceptibility in Arabidopsis thaliana. Here, we describe the Arabidopsis constitutive shade-avoidance1 (csa1) mutant, which shows a shade-avoidance phenotype in the absence of shade and enhanced growth of a bacterial pathogen. The csa1 mutant has a T-DNA inserted within the second exon of a Toll/Interleukin1 receptor-nucleotide binding site-leucine-rich repeat (TIR-NBS-LRR) gene, which leads to the production of a truncated mRNA. Arabidopsis plants transformed with the truncated TIR-NBS-LRR gene recapitulate the mutant phenotype, indicating that csa1 is a dominant-negative mutation that interferes with phytochrome signaling. TIR-NBS-LRR proteins have been implicated in defense responses in plants. RPS4, the closest homolog of CSA1, confers resistance to Pseudomonas syringae and complements the csa1 mutant phenotype, indicating that responses to pathogens and neighbors share core-signaling components in Arabidopsis. In Drosophila melanogaster and Caenorhabditis elegans, TIR domain proteins are implicated in both development and immunity. Thus, the dual role of the TIR domain is conserved across kingdoms.
引用
收藏
页码:2919 / 2928
页数:10
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