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AOBPreview published online on November 20, 2003
Annals of Botany, doi:10.1093/aob/mch014
© 2003 by Annals of Botany Company
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Submitted on June 2, 2003
Revised on September 12, 2003
Accepted on October 3, 2003

Graft Union Formation in Tomato Plants: Peroxidase and Catalase Involvement

NIEVES FERNÁNDEZ-GARCÍA1, MICAELA CARVAJAL1, and ENRIQUE OLMOS1*

Affiliation of the authors: 1 Departamento de Fisiología y Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura, CSIC, Aptdo. Correos 164, 30100 Murcia, Spain

* To whom correspondence should be addressed. E-mail: eolmos{at}cebas.csic.es.

• Background and Aims The use of grafted plants in vegetable crop production is now being expanded greatly. However, few data are available on the formation of graft unions in vegetables. In this work, the structural development of the graft union formation in tomato plants is studied, together with the possible relationship with activities of peroxidases and catalases.

• Methods Tomato (Lycopersicon esculentum Mill.) seedlings of cultivar Fanny were grafted on the rootstock of cultivar AR-9704 using the ‘tongue approach grafting’ method, and were grown in a crop chamber. A study of the structural development of the graft union and the involvement of peroxidases and catalases in the process of graft formation was carried out during the first stages of the graft union (4, 8 and 15 d after grafting).

• Key Results Observation of the structure of the graft union showed formation of xylem and phloem vessels through the graft union 8 d after grafting. In addition, root hydraulic conductance, L0, indicate that the graft union is fully functional 8 d after grafting, which coincided with an increase of peroxidase and catalase activities.

• Conclusions These results suggest that increased peroxidase and catalase activities might be implicated in graft development in tomato plants.
Key words: Catalase, graft, Lycopersicon esculentum, peroxidase, tomato.


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