Abstract：
:Cryptogein, a 98 amino acid protein secreted by the fungus Phytophthora cryptogea, induces a hypersensitive response and systemic acquired resistance in tobacco plants (Nicotiana tabacum var Xanthi). The mode of action of cryptogein has been studied using tobacco cell suspensions. The recognition of this elicitor by a plasma membrane receptor leads to a cascade of events including protein phosphorylation, calcium influx, potassium and chloride effluxes, plasma membrane depolarization, activation of a NADPH oxidase responsible for active oxygen species (AOS) production and cytosol acidification, activation of the pentose phosphate pathway, and activation of two mitogen-activated protein kinase (MAPK) homologues. The organization of the cryptogein responses reveals that the earliest steps of the signal transduction pathway involve plasma membrane activities. Their activation generates a complex network of second messengers which triggers the specific physiological responses. This study may contribute to our understanding of plant signaling processes because elicitors and a variety of signals including hormones, Nod factors, light, gravity and stresses share some common transduction elements and pathways.
journal_name
Biochimiejournal_title
Biochimieauthors
Lebrun-Garcia A,Bourque S,Binet MN,Ouaked F,Wendehenne D,Chiltz A,Schäffner A,Pugin Adoi
10.1016/s0300-9084(99)80123-0keywords:
subject
Has Abstractpub_date
1999-06-01 00:00:00pages
663-8issue
6eissn
0300-9084issn
1638-6183pii
S0300-9084(99)80123-0journal_volume
81pub_type
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