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JXB Advance Access originally published online on December 6, 2004
Journal of Experimental Botany 2005 56(412):605-611; doi:10.1093/jxb/eri036
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Journal of Experimental Botany, Vol. 56, No. 412, © Society for Experimental Biology 2004; all rights reserved

RESEARCH PAPER

A red beet (Beta vulgaris) UDP-glucosyltransferase gene induced by wounding, bacterial infiltration and oxidative stress

Gabriela Sepúlveda-Jiménez1,2, Patricia Rueda-Benítez1, Helena Porta1 and Mario Rocha-Sosa1,*

1Instituto de Biotecnología, UNAM, Apartado Postal 510-3, Cuernavaca 62250 Morelos, México
2Centro de Desarrollo de Productos Bióticos-IPN, PO Box No. 24, Yautepec 62731 Morelos, México

* To whom correspondence should be addressed. Fax: +52 777 3 17 23 88. E-mail: rocha{at}ibt.unam.mx

Mechanical wounding, infiltration with P. syringae or A. tumefaciens, and exposure to an H2O2-generating system (Glc/Glc oxidase) induce betacyanin synthesis in red beet (Beta vulgaris) leaves. These conditions also induced the expression of BvGT, a gene encoding a glucosyltransferase (GT) from Beta vulgaris. BvGT has a high similarity to Dorotheanthus bellidiformis betanidin-5 GT involved in betacyanin synthesis. Furthermore, the transient expression of a BvGT antisense construct resulted in the reduction of BvGT transcript accumulation and betanin synthesis, suggesting a role for this gene product in betacyanin glucosylation. In addition, the NADPH oxidase inhibitor, diphenylene iodonium (DPI), inhibited the accumulation of the BvGT transcript in response to infiltration with Agrobacterium tumefaciens. Hence, this result suggests that ROS produced by a plasma membrane NADPH oxidase may act as a signal to induce BvGT expression, necessary for betanin synthesis after wounding and bacterial infiltration.

Key words: Bacterial infiltration, betacyanin, Beta vulgaris, glucosyltransferase, red beet, wounding


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