期刊
PLANT PHYSIOLOGY
卷 182, 期 2, 页码 1161-1181出版社
OXFORD UNIV PRESS INC
DOI: 10.1104/pp.19.00893
关键词
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资金
- Academy of Finland [289687, 307719, 303757, 317218]
- Academy of Finland Center of Excellence in Primary Producers 2014-2019 [307335]
- University of Turku Doctoral Programme in Molecular Life Sciences
- Turku University Foundation
- Finnish Cultural Foundation Varsinais-Suomi Regional Fund
- Danish National Research Foundation [99]
- Villumfonden [13169]
- Scandinavian Society for Plant Physiology
- Deutsches Forschungsgemeinschaft Heisenberg Fellowship [GL346/5]
- University of Helsinki Doctoral Program in Plant Science
- Ella and Georg Ehrnrooth Foundation
- Finnish Functional Genomics Centre, University of Turku
- Abo Akademi
- Biocenter Finland
- Academy of Finland (AKA) [317218, 317218, 307719, 289687, 289687] Funding Source: Academy of Finland (AKA)
Plants optimize their growth and survival through highly integrated regulatory networks that coordinate defensive measures and developmental transitions in response to environmental cues. Protein phosphatase 2A (PP2A) is a key signaling component that controls stress reactions and growth at different stages of plant development, and the PP2A regulatory subunit PP2A-B'gamma is required for negative regulation of pathogenesis responses and for maintenance of cell homeostasis in short-day conditions. Here, we report molecular mechanisms by which PP2A-B'gamma regulates Botrytis cinerea resistance and leaf senescence in Arabidopsis (Arabidopsis thaliana). We extend the molecular functionality of PP2A-B'gamma to a protein kinase-phosphatase interaction with the defense-associated calcium-dependent protein kinase CPK1 and present indications this interaction may function to control CPK1 activity. In presenescent leaf tissues, PP2A-B'gamma is also required to negatively control the expression of salicylic acid-related defense genes, which have recently proven vital in plant resistance to necrotrophic fungal pathogens. In addition, we find the premature leaf yellowing of pp2a-b'gamma depends on salicylic acid biosynthesis via SALICYLIC ACID INDUCTION DEFICIENT2 and bears the hallmarks of developmental leaf senescence. We propose PP2A-B'gamma age-dependently controls salicylic acid-related signaling in plant immunity and developmental leaf senescence.
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