Jasmonate response decay and defense metabolite accumulation contributes to age-regulated dynamics of plant insect resistance

Ying-Bo Mao, Yao-Qian Liu, Dian-Yang Chen, Fang-Yan Chen, Xin Fang, Gao-Jie Hong, Ling-Jian Wang, Jia-Wei Wang and Xiao-Ya Chen ()
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Ying-Bo Mao: National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, University of CAS, Chinese Academy of Sciences
Yao-Qian Liu: School of Life Science and Technology, ShanghaiTech University
Dian-Yang Chen: National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, University of CAS, Chinese Academy of Sciences
Fang-Yan Chen: School of Life Science and Technology, ShanghaiTech University
Xin Fang: National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, University of CAS, Chinese Academy of Sciences
Gao-Jie Hong: State Key Laboratory of Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences
Ling-Jian Wang: National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, University of CAS, Chinese Academy of Sciences
Jia-Wei Wang: National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, University of CAS, Chinese Academy of Sciences
Xiao-Ya Chen: National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, University of CAS, Chinese Academy of Sciences

Nature Communications, 2017, vol. 8, issue 1, 1-13

Abstract: Abstract Immunity deteriorates with age in animals but comparatively little is known about the temporal regulation of plant resistance to herbivores. The phytohormone jasmonate (JA) is a key regulator of plant insect defense. Here, we show that the JA response decays progressively in Arabidopsis. We show that this decay is regulated by the miR156-targeted SQUAMOSA PROMOTER BINDING PROTEIN-LIKE9 (SPL9) group of proteins, which can interact with JA ZIM-domain (JAZ) proteins, including JAZ3. As SPL9 levels gradually increase, JAZ3 accumulates and the JA response is attenuated. We provide evidence that this pathway contributes to insect resistance in young plants. Interestingly however, despite the decay in JA response, older plants are still comparatively more resistant to both the lepidopteran generalist Helicoverpa armigera and the specialist Plutella xylostella, along with increased accumulation of glucosinolates. We propose a model whereby constitutive accumulation of defense compounds plays a role in compensating for age-related JA-response attenuation during plant maturation.

Date: 2017
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DOI: 10.1038/ncomms13925

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