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Plant Molecular Biology
Eyal, Y., Department of Plant Genetics, The Weizmann Institute of Science, P.O. Box 26, Rehovot, 76100, Israel
Sagee, O., Department of Citriculture, Agricultural Research Organization, The Volcani Center, Bet-Dagan, 50250, Israel
Fluhr, R., Department of Plant Genetics, The Weizmann Institute of Science, P.O. Box 26, Rehovot, 76100, Israel
A gene encoding a basic-type pathogenesis-related protein from Nicotiana tabacum (prb-1b) was cloned, sequenced and characterized. It contains an open reading frame of 179 amino acids that is ca. 65% homologous with the acidic PR-1 class of pathogenesis-related proteins and 87% homologous with a different basic-type PR-1 gene. In the light, physiological levels of ethylene rapidly (1 h) induced basic, but not acidic-type, PR-1 transcript. Additional elicitors acting via ethylene, such as α-aminobutyric acid, were shown to induce basic- and acidic-type PR-1 transcript accumulation in a light-dependent manner. In contrast, xylanase, an ethylene-independent elicitor, induced transcript accumulation of basic- and acidic-type PR-1 in a light-independent manner. Dark-induced accumulation of basic PR-1 transcript occurred at night in greenhouse-grown plants and, to a greater extent, in continuously dark-treated plants. The novel dark regulation may point to additional nonpathogenesis-related roles for these genes in plant-environment interactions. © 1992 Kluwer Academic Publishers.
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Dark-induced accumulation of a basic pathogenesis-related (PR-1) transcript and a light requirement for its induction by ethylene
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Eyal, Y., Department of Plant Genetics, The Weizmann Institute of Science, P.O. Box 26, Rehovot, 76100, Israel
Sagee, O., Department of Citriculture, Agricultural Research Organization, The Volcani Center, Bet-Dagan, 50250, Israel
Fluhr, R., Department of Plant Genetics, The Weizmann Institute of Science, P.O. Box 26, Rehovot, 76100, Israel
Dark-induced accumulation of a basic pathogenesis-related (PR-1) transcript and a light requirement for its induction by ethylene
A gene encoding a basic-type pathogenesis-related protein from Nicotiana tabacum (prb-1b) was cloned, sequenced and characterized. It contains an open reading frame of 179 amino acids that is ca. 65% homologous with the acidic PR-1 class of pathogenesis-related proteins and 87% homologous with a different basic-type PR-1 gene. In the light, physiological levels of ethylene rapidly (1 h) induced basic, but not acidic-type, PR-1 transcript. Additional elicitors acting via ethylene, such as α-aminobutyric acid, were shown to induce basic- and acidic-type PR-1 transcript accumulation in a light-dependent manner. In contrast, xylanase, an ethylene-independent elicitor, induced transcript accumulation of basic- and acidic-type PR-1 in a light-independent manner. Dark-induced accumulation of basic PR-1 transcript occurred at night in greenhouse-grown plants and, to a greater extent, in continuously dark-treated plants. The novel dark regulation may point to additional nonpathogenesis-related roles for these genes in plant-environment interactions. © 1992 Kluwer Academic Publishers.
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