PROTEIN PHOSPHATASE 2A-B'γ Controls Botrytis cinerea Resistance and Developmental Leaf Senescence.
Plant Physiol
; 182(2): 1161-1181, 2020 02.
Article
em En
| MEDLINE
| ID: mdl-31659127
ABSTRACT
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'γ 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'γ regulates Botrytis cinerea resistance and leaf senescence in Arabidopsis (Arabidopsis thaliana). We extend the molecular functionality of PP2A-B'γ 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'γ 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'γ depends on salicylic acid biosynthesis via SALICYLIC ACID INDUCTION DEFICIENT2 and bears the hallmarks of developmental leaf senescence. We propose PP2A-B'γ age-dependently controls salicylic acid-related signaling in plant immunity and developmental leaf senescence.
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Base de dados:
MEDLINE
Assunto principal:
Doenças das Plantas
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Senescência Celular
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Arabidopsis
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Folhas de Planta
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Botrytis
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Proteínas de Arabidopsis
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Proteína Fosfatase 2
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Resistência à Doença
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article