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An ankyrin repeat‐containing protein plays a role in both disease resistance and antioxidation metabolism
Author(s) -
Yan Juqiang,
Wang Jing,
Zhang Hong
Publication year - 2002
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1046/j.0960-7412.2001.01205.x
Subject(s) - ankyrin repeat , biology , pathogen , plant disease resistance , gene , peroxidase , arabidopsis , regulator , microbiology and biotechnology , biochemistry , genetics , enzyme , mutant
Summary The Arabidopsis ankyrin repeat‐containing protein AKR2 was identified as a GF14λ‐interacting protein in a yeast two‐hybrid screening (GF14λ is a 14‐3‐3 protein). Reduced expression of AKR2 by using the antisense technique results in small necrotic areas in leaves accompanied by higher production of H 2 O 2 , similar to the hypersensitive response to pathogen infection in plant disease resistance. Transcripts of genes encoding pathogen‐induced protein PR‐1 (pathogen‐related protein 1) and stress‐responsive protein GST6 (glutathione S‐transferase 6) are increased in antisense plants. The resistance to a bacterial pathogen infection was also increased by at least 10‐fold in antisense plants. AKR2 also interacts with another GF14λ‐interacting protein, the ascorbate peroxidase 3 that scavenges H 2 O 2 in plant cells. These data suggest that AKR2 may be a negative regulator of PR‐1 expression, and is probably involved in the regulation of antioxidation metabolism that is shared by both disease resistance and stress responses.