Summary: Identification of an essential component of the elicitation
active site of the EIX protein elicitor
, David Enshell-Seijffers2
, Jonathan M. Gershoni2
, Silvia Schuster1
and Adi Avni1,Ã
Department of Plant Sciences, and
Department of Cell Research and Immunology, Faculty of Life Sciences Tel Aviv University, Ramat Aviv,
Tel Aviv 69978, Israel
Received 5 April 2002; revised 17 September 2002; accepted 24 September 2002.
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Defense mechanisms of plants against pathogens often entail cell wall strengthening, ethylene biosynth-
esis, expression of pathogen-related proteins and hypersensitive responses (HR). Pathogen-derived elicitors
trigger these defense responses. The Elicitor Ethylene-inducing Xylanase (EIX) elicits HR and other plant
defense responses in some tobacco and tomato cultivars independently of its xylan degradation activity.