Multiple phytohormone signalling pathways modulate susceptibility of tomato plants to Alternaria alternata f. sp. lycopersici

Three phytohormone molecules – ethylene (ET), jasmonic acid (JA) and salicylic acid (SA) – play key roles in mediating disease response to necrotrophic fungal pathogens. This study investigated the roles of the ET, JA, and SA pathways as well as their crosstalk during the interaction between tomato...

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Bibliographic Details
Published in:Journal of experimental botany 2013, Vol.64 (2), p.637-650
Main Authors: Jia, Chengguo, Zhang, Liping, Liu, Lihong, Wang, Jiansheng, Li, Chuanyou, Wang, Qiaomei
Format: Article
Language:English
Subjects:
Alternaria - physiology
Alternaria alternata
Biological and medical sciences
biosynthesis
Cyclopentanes - immunology
ethylene
Ethylenes - immunology
Fundamental and applied biological sciences. Psychology
fungi
jasmonic acid
Lycopersicon esculentum
Lycopersicon esculentum - immunology
Lycopersicon esculentum - microbiology
Oxylipins - immunology
pathogens
Phytopathology. Animal pests. Plant and forest protection
Plant Diseases - immunology
Plant Diseases - microbiology
Plant Growth Regulators - immunology
Plant physiology and development
RESEARCH PAPER
salicylic acid
Salicylic Acid - immunology
Signal Transduction
Solanum
Solanum lycopersicum
tomatoes
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Summary:Three phytohormone molecules – ethylene (ET), jasmonic acid (JA) and salicylic acid (SA) – play key roles in mediating disease response to necrotrophic fungal pathogens. This study investigated the roles of the ET, JA, and SA pathways as well as their crosstalk during the interaction between tomato (Solanum lycopersicum) plants and a necrotrophic fungal pathogen Alternaria alternata f. sp. lycopersici (AAL). Both the ET and JASMONIC ACID INSENSITIVE1 (JAI1) receptor-dependent JA signalling pathways are necessary for susceptibility, while SA response promotes resistance to AAL infection. In addition, the role of JA in susceptibility to AAL is partly dependent on ET biosynthesis and perception, while the SA pathway enhances resistance to AAL and antagonizes the ET response. Based on these results, it is proposed that ET, JA, and SA each on their own can influence the susceptibility of tomato to AAL. Furthermore, the functions of JA and SA in susceptibility to the pathogen are correlated with the enhanced or decreased action of ET, respectively. This study has revealed the functional relationship among the three key hormone pathways in tomato defence against AAL.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/ers360