Abstract:
:Treatment of suspension-cultured tobacco (Nicotiana tabacum var Xanthi) cells with cryptogein, a proteinaceous elicitor from Phytophthora cryptogea, induced a great stimulation of Ca2+ influx within the first minutes. Ca2+ influx is essential for the initiation of cryptogein-induced responses, since ethyleneglycol-bis([beta]-amino-ethyl ether)-N,N[prime]-tetraacetic acid or La3+, which block Ca2+ entrance, suppress cryptogein-induced responses such as extracellular alkalinization, active oxygen species, and phytoalexin production. Moreover, once initiated, these responses require sustained Ca2+ influx within the 1st h. A Ca2+ ionophore (A23187) was able to trigger an extracellular alkalinization but not the formation of active oxygen species and phytoalexins, even in the presence of cryptogein. Staurosporine, a protein kinase inhibitor that was recently reported to suppress cryptogein-induced responses (M.-P. Viard, F. Martin, A. Pugin, P. Ricci, J.-P. Blein [1994] Plant Physiol 104: 1245-1249), inhibited Ca2+ influx induced by cryptogein in a dose-dependent manner. These results suggest that protein phosphorylation followed by Ca2+ influx might be involved in the initial steps of cryptogein signal transduction.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Tavernier E,Wendehenne D,Blein JP,Pugin Adoi
10.1104/pp.109.3.1025subject
Has Abstractpub_date
1995-11-01 00:00:00pages
1025-1031issue
3eissn
0032-0889issn
1532-2548pii
109/3/1025journal_volume
109pub_type
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