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AOBPreview originally published online on November 20, 2003
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Annals of Botany 93: 53-60, 2004
© 2004 Annals of Botany Company

Graft Union Formation in Tomato Plants: Peroxidase and Catalase Involvement

NIEVES FERNÁNDEZ-GARCÍA, MICAELA CARVAJAL and ENRIQUE OLMOS*,

Departamento de Fisiología y Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura, CSIC, Aptdo. Correos 164, 30100 Murcia, Spain

* For correspondence. Fax 0034 968 39 62 11, e-mail eolmos{at}cebas.csic.es

Received: 2 June 2003; Returned for revision: 12 September 2003; Accepted: 3 October 2003    Published electronically: 20 November 2003

• 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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