An S-locus receptor-like kinase plays a role as a negative regulator in plant defense responses.
Plant cells often use cell surface receptors to sense environmental changes and then transduce external signals via activated signaling pathways to trigger adaptive responses. In Arabidopsis, the receptor-like protein kinase (RLK) gene family contains more than 600 members, and some of these are induced by pathogen infection, suggesting a possible role in plant defense responses. We previously characterized an S-locus RLK (CBRLK1) at the biochemical level. In this study, we examined the physiological function of CBRLK1 in defense responses. CBRLK1 mutant and CBRLK1-overexpressing transgenic plants showed enhanced and reduced resistance against a virulent bacterial pathogen, respectively. The altered pathogen resistances of the mutant and overexpressing transgenic plants were associated with increased and reduced induction of the pathogenesis-related gene PR1, respectively. These results suggest that CBRLK1 plays a negative role in the disease resistance signaling pathway in Arabidopsis.
Kim
Ho Soo
HS
Division of Applied Life Science (BK21 Program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju 660-701, Republic of Korea.
Jung
Mi Soon
MS
Lee
Sang Min
SM
Kim
Kyung Eun
KE
Byun
Hyejin
H
Choi
Man Soo
MS
Park
Hyeong Cheol
HC
Cho
Moo Je
MJ
Chung
Woo Sik
WS
D017360:Arabidopsis / Q000187:drug effects / Q000201:enzymology* / Q000235:genetics / Q000382:microbiology; D029681:Arabidopsis Proteins / Q000235:genetics / Q000502:physiology*; D009154:Mutation; D010935:Plant Diseases / Q000276:immunology / Q000382:microbiology*; D010940:Plant Proteins / Q000235:genetics / Q000502:physiology*; D030821:Plants, Genetically Modified / Q000187:drug effects / Q000201:enzymology / Q000235:genetics / Q000382:microbiology; D011494:Protein Kinases / Q000235:genetics / Q000502:physiology*; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000502:physiology*; D020156:Salicylic Acid / Q000494:pharmacology; D014158:Transcription, Genetic
D029681:Arabidopsis Proteins; D010940:Plant Proteins; D011494:Protein Kinases; C538996:CBRLK1 protein, Arabidopsis; D017346:Protein Serine-Threonine Kinases; C079832:S-receptor kinase; D020156:Salicylic Acid