A Tomato Peroxidase Involved in the Synthesis of Lignin and Suberin1 (original) (raw)

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1Departamento de Biologı́a Molecular, Universidad Nacional de Rı́o Cuarto, 5800 Rı́o Cuarto (Cba), Argentina (M.Q., M.I.M., S.M.d.F., H.T.);

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2Departamento de Biologı́a Molecular y Bioquı́mica, Universidad de Málaga, 29071 Málaga, Spain (C.G., M.A.B., I.A., F.J.A., V.V.); and

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2Departamento de Biologı́a Molecular y Bioquı́mica, Universidad de Málaga, 29071 Málaga, Spain (C.G., M.A.B., I.A., F.J.A., V.V.); and

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3Centro de Investigación y Formación Agraria, Churriana, 29140 Málaga, Spain (A.B.)

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2Departamento de Biologı́a Molecular y Bioquı́mica, Universidad de Málaga, 29071 Málaga, Spain (C.G., M.A.B., I.A., F.J.A., V.V.); and

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1Departamento de Biologı́a Molecular, Universidad Nacional de Rı́o Cuarto, 5800 Rı́o Cuarto (Cba), Argentina (M.Q., M.I.M., S.M.d.F., H.T.);

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2Departamento de Biologı́a Molecular y Bioquı́mica, Universidad de Málaga, 29071 Málaga, Spain (C.G., M.A.B., I.A., F.J.A., V.V.); and

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Silvia Milrad de Forchetti

1Departamento de Biologı́a Molecular, Universidad Nacional de Rı́o Cuarto, 5800 Rı́o Cuarto (Cba), Argentina (M.Q., M.I.M., S.M.d.F., H.T.);

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1Departamento de Biologı́a Molecular, Universidad Nacional de Rı́o Cuarto, 5800 Rı́o Cuarto (Cba), Argentina (M.Q., M.I.M., S.M.d.F., H.T.);

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2Departamento de Biologı́a Molecular y Bioquı́mica, Universidad de Málaga, 29071 Málaga, Spain (C.G., M.A.B., I.A., F.J.A., V.V.); and

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Received:

13 October 1999

Accepted:

30 December 1999

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Mónica Quiroga, Consuelo Guerrero, Miguel A. Botella, Araceli Barceló, Iraida Amaya, Marı́a I. Medina, Francisco J. Alonso, Silvia Milrad de Forchetti, Horacio Tigier, Victoriano Valpuesta, A Tomato Peroxidase Involved in the Synthesis of Lignin and Suberin, Plant Physiology, Volume 122, Issue 4, April 2000, Pages 1119–1128, https://doi.org/10.1104/pp.122.4.1119
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Abstract

The last step in the synthesis of lignin and suberin has been proposed to be catalyzed by peroxidases, although other proteins may also be involved. To determine which peroxidases are involved in the synthesis of lignin and suberin, five peroxidases from tomato (Lycopersicon esculentum) roots, representing the majority of the peroxidase activity in this organ, have been partially purified and characterized kinetically. The purified peroxidases with isoelectric point (pI) values of 3.6 and 9.6 showed the highest catalytic efficiency when the substrate used was syringaldazine, an analog of lignin monomer. Using a combination of transgenic expression and antibody recognition, we now show that the peroxidase pI 9.6 is probably encoded by TPX1, a tomato peroxidase gene we have previously isolated. In situ RNA hybridization revealed that TPX1 expression is restricted to cells undergoing synthesis of lignin and suberin. Salt stress has been reported to induce the synthesis of lignin and/or suberin. This stress applied to tomato caused changes in the expression pattern of_TPX1_ and induced the TPX1 protein. We propose that the_TPX1_ product is involved in the synthesis of lignin and suberin.

Copyright © 2000 American Society of Plant Physiologists

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