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Plant Defense Genes Are Synergistically Induced by Ethylene and Methyl Jasmonate.

Y. Xu, PFL. Chang, D. Liu, M. L. Narasimhan, K. G. Raghothama, P. M. Hasegawa, R. A. Bressan
Y. Xu
Center for Plant Environmental Stress Physiology, Purdue University, 1165 Horticulture Building, West Lafayette, Indiana 47907-1165.
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PFL. Chang
Center for Plant Environmental Stress Physiology, Purdue University, 1165 Horticulture Building, West Lafayette, Indiana 47907-1165.
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D. Liu
Center for Plant Environmental Stress Physiology, Purdue University, 1165 Horticulture Building, West Lafayette, Indiana 47907-1165.
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M. L. Narasimhan
Center for Plant Environmental Stress Physiology, Purdue University, 1165 Horticulture Building, West Lafayette, Indiana 47907-1165.
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K. G. Raghothama
Center for Plant Environmental Stress Physiology, Purdue University, 1165 Horticulture Building, West Lafayette, Indiana 47907-1165.
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P. M. Hasegawa
Center for Plant Environmental Stress Physiology, Purdue University, 1165 Horticulture Building, West Lafayette, Indiana 47907-1165.
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R. A. Bressan
Center for Plant Environmental Stress Physiology, Purdue University, 1165 Horticulture Building, West Lafayette, Indiana 47907-1165.
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Published August 1994. DOI: https://doi.org/10.1105/tpc.6.8.1077

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Abstract

Combinations of ethylene and methyl jasmonate (E/MeJA) synergistically induced members of both groups 1 and 5 of the pathogenesis-related (PR) superfamily of defense genes. E/MeJA caused a synergistic induction of PR-1b and osmotin (PR-5) mRNA accumulation in tobacco seedlings. E/MeJA also synergistically activated the osmotin promoter fused to a [beta]-glucuronidase marker gene in a tissue-specific manner. The E/MeJA responsiveness of the osmotin promoter was localized on a -248 to +45 fragment that exhibited responsiveness to several other inducers. E/MeJA induction also resulted in osmotin protein accumulation to levels similar to those induced by osmotic stress. Of the several known inducers of the osmotin gene, including salicylic acid (SA), fungal infection is the only other condition known to cause substantial osmotin protein accumulation in Wisconsin 38, a tobacco cultivar that does not respond hypersensitively to tobacco mosaic virus. Based on the ability of the protein kinase C inhibitor 1-(5-isoquinolinylsulfonyl)-2-methylpiperazine to block ethylene induction of PR-1b mRNA accumulation and its inability to block osmotin mRNA induction by ethylene, these two PR gene groups appeared to have at least partially separate signal transduction pathways. Stimulation of osmotin mRNA accumulation by okadaic acid indicated that another protein kinase system is involved in regulation of the osmotin gene. SA, which is known to induce pathogen resistance in tobacco, could not induce the osmotin gene as much as E/MeJA and neither could it induce PR-1b as much as SA and MeJA combined.

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Plant Defense Genes Are Synergistically Induced by Ethylene and Methyl Jasmonate.
Y. Xu, PFL. Chang, D. Liu, M. L. Narasimhan, K. G. Raghothama, P. M. Hasegawa, R. A. Bressan
The Plant Cell Aug 1994, 6 (8) 1077-1085; DOI: 10.1105/tpc.6.8.1077

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Plant Defense Genes Are Synergistically Induced by Ethylene and Methyl Jasmonate.
Y. Xu, PFL. Chang, D. Liu, M. L. Narasimhan, K. G. Raghothama, P. M. Hasegawa, R. A. Bressan
The Plant Cell Aug 1994, 6 (8) 1077-1085; DOI: 10.1105/tpc.6.8.1077
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