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Mol Plant Microbe Interact

Title:		A novel jasmonic acid-inducible rice myb gene associates with fungal infection and host cell death
Author(s):		Lee MW; Qi M; Yang Y;
Address:		"Department of Plant Pathology, University of Arkansas, Fayetteville 72701, USA"
Journal Title:		Mol Plant Microbe Interact
Year:		2001
Volume:		14
Issue:		4
Page Number:		527 - 535
DOI:		10.1094/MPMI.2001.14.4.527
ISSN/ISBN:		0894-0282 (Print) 0894-0282 (Linking)
Abstract:		"Endogenous signal molecules such as jasmonic acid (JA) and salicylic acid (SA) play an important role in induced resistance against pathogen infection and insect herbivory. In rice seedlings, JA is an effective inducer of systemic acquired resistance (SAR) against infection of blast fungus (Pyricularia grisea). To gain further insights into JA-mediated defense signaling pathways, we isolated and characterized a pathogen- and JA-induced rice gene (JAmyb) that encodes a Myb transcription factor. The JAmyb gene was induced within 1 day after fungal infection in resistant and susceptible interactions prior to lesion formation. Unlike most defense-related genes that are activated faster and stronger in resistant interactions, JAmyb induction by blast fungus is much higher in susceptible interactions, accompanied by large lesions and extensive tissue damage. Significant induction of JAmyb also was observed during cell death and lesion formation in certain lesion mimic mutants. Interestingly, JAmyb was activated rapidly by JA or wounding, independent of de novo protein synthesis, but not by other endogenous signal molecules such as SA and abscisic acid or SAR inducers such as benzothiadiazole and probenazole. We used SA-deficient transgenic plants to further demonstrate that depletion of SA in rice did not abolish but rather enhanced blast-induced JAmyb expression. These results suggest that JAmyb is related closely to host cell death and is involved in the JA-mediated, SA-independent signaling pathways in rice"
Keywords:		"Amino Acid Sequence Base Sequence *Cell Death Cloning, Molecular Cycloheximide/pharmacology Cyclopentanes/*pharmacology DNA, Complementary Gene Expression Regulation, Plant/drug effects *Genes, myb Magnaporthe/*physiology Molecular Sequence Data Oryza/cyt;"
Notes:		"MedlineLee, M W Qi, M Yang, Y eng 2001/04/20 Mol Plant Microbe Interact. 2001 Apr; 14(4):527-35. doi: 10.1094/MPMI.2001.14.4.527"