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Plant Physiol, April 2000, Vol. 122, pp. 1119-1128
A Tomato Peroxidase Involved in the Synthesis of Lignin and
Suberin1
Mónica
Quiroga,
Consuelo
Guerrero,
Miguel A.
Botella,
Araceli
Barceló,
Iraida
Amaya,
María I.
Medina,
Francisco J.
Alonso,
Silvia Milrad
de Forchetti,
Horacio
Tigier, and
Victoriano
Valpuesta*
Departamento de Biología Molecular, Universidad Nacional de
Río Cuarto, 5800 Río Cuarto (Cba), Argentina (M.Q.,
M.I.M., S.M.d.F., H.T.); Departamento de Biología Molecular y
Bioquímica, Universidad de Málaga, 29071 Málaga,
Spain (C.G., M.A.B., I.A., F.J.A., V.V.); and Centro de
Investigación y Formación Agraria, Churriana, 29140 Málaga, Spain (A.B.)
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.
1
This research was supported by Comisión
Interministerial de Ciencia y Tecnología (grant no.
BIO94-0622-CO2-01) from the Ministerio de Educación y Ciencia,
Spain, and by Consejo Investigaciones Científicas y
Técnicas Provincia de Córdoba, Secretaría Ciencia y
Técnica-Universidad Nacional Río Cuarto, and Consejo
Nacional de Investigaciones Científicas y Técnicas from
Argentina. M.Q. was the recipient of a fellowship from Consejo
Investigaciones Científicas y Técnicas Provincia de
Córdoba, Córdoba, Argentina, and she acknowledges the
Agencia Esparíola de Cooperación Internacional, Spain, for
short-term financial support to stay in Málaga, Spain.
*
Corresponding author; e-mail valpuesta{at}uma.es; fax
34-95-213-1932.
© 2000 American Society of Plant Physiologists
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