title: Exploring growth-defence trade-offs in Arabidopsis: phytochrome B inactivation requires JAZ10 to suppress plant immunity but not to trigger shade-avoidance responses.
abstract: Under conditions that involve a high risk of competition for light among neighbouring plants, shade-intolerant species often display increased shoot elongation and greater susceptibility to pathogens and herbivores. The functional links between morphological and defence responses to crowding are not well understood. In Arabidopsis, the protein JAZ10 is thought to play a key role connecting the inactivation of the photoreceptor phytochrome B (phyB), which takes place under competition for light, with the repression of jasmonate-mediated plant defences. Here, we show that a null mutation of the JAZ10 gene in Arabidopsis did not affect plant growth nor did it suppress the shade-avoidance responses elicited by phyB inactivation. However, the jaz10 mutation restored many of the defence traits that are missing in the phyB mutant, including the ability to express robust responses to jasmonate and to accumulate indolic glucosinolates. Furthermore, the jaz10phyB double mutant showed a significantly increased resistance to the pathogenic fungus Botrytis cinerea compared with the phyB parental line. Our results demonstrate that, by inactivating JAZ10, it is possible to partially uncouple shade avoidance from defence suppression in Arabidopsis. These findings may provide clues to improve plant resistance to pathogens in crops that are planted at high density.
authors.affiliation: Instituto de Investigaciones Biotecnológicas, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de San Martín, B1650HMP, San Martín, Buenos Aires, Argentina.|IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Avenida San Martín 4453, C1417DSE, Ciudad de Buenos Aires, Argentina.
authors.forename: Ignacio
authors.initials: I
authors.lastname: Cerrudo
authors.affiliation: Instituto de Investigaciones Biotecnológicas, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de San Martín, B1650HMP, San Martín, Buenos Aires, Argentina.
authors.forename: M Emilia
authors.initials: ME
authors.lastname: Caliri-Ortiz
authors.affiliation: IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Avenida San Martín 4453, C1417DSE, Ciudad de Buenos Aires, Argentina.
authors.forename: Mercedes M
authors.initials: MM
authors.lastname: Keller
authors.affiliation: IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Avenida San Martín 4453, C1417DSE, Ciudad de Buenos Aires, Argentina.
authors.forename: M Eugenia
authors.initials: ME
authors.lastname: Degano
authors.affiliation: IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Avenida San Martín 4453, C1417DSE, Ciudad de Buenos Aires, Argentina.
authors.forename: Patricia V
authors.initials: PV
authors.lastname: Demkura
authors.affiliation: Instituto de Investigaciones Biotecnológicas, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de San Martín, B1650HMP, San Martín, Buenos Aires, Argentina.|IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Avenida San Martín 4453, C1417DSE, Ciudad de Buenos Aires, Argentina.
authors.forename: Carlos L
authors.initials: CL
authors.lastname: Ballaré
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000254:growth & development* / Q000276:immunology / Q000502:physiology; D029681:Arabidopsis Proteins / Q000378:metabolism* / Q000502:physiology*; D020171:Botrytis / Q000502:physiology; D003517:Cyclopentanes / Q000378:metabolism; D060467:Disease Resistance / Q000528:radiation effects; D018506:Gene Expression Regulation, Plant / Q000528:radiation effects; D017343:Genes, Plant; D005961:Glucosinolates / Q000378:metabolism; D008027:Light; D009154:Mutation / Q000235:genetics; D009687:Nuclear Proteins / Q000378:metabolism* / Q000502:physiology*; D054883:Oxylipins / Q000378:metabolism; D051939:Phytochrome B / Q000378:metabolism*; D010935:Plant Diseases / Q000276:immunology / Q000382:microbiology; D057865:Plant Immunity / Q000528:radiation effects; D015854:Up-Regulation / Q000235:genetics / Q000528:radiation effects
chemical_list: D029681:Arabidopsis Proteins; D003517:Cyclopentanes; D005961:Glucosinolates; C525049:JAS1 protein, Arabidopsis; D009687:Nuclear Proteins; D054883:Oxylipins; C497952:PHYB protein, Arabidopsis; D051939:Phytochrome B; C011006:jasmonic acid
keywords: Jasmonate; light quality; pathogens; red/far-red ratio; signalling