Graft Union Formation in Tomato Plants: Peroxidase and Catalase Involvement

• 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...

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Bibliographic Details
Published in:Annals of botany 2004-01, Vol.93 (1), p.53-60
Main Authors: FERNÁNDEZ‐GARCÍA, NIEVES, CARVAJAL, MICAELA, OLMOS, ENRIQUE
Format: Article
Language:English
Subjects:
Biomechanical Phenomena
Catalase - metabolism
graft
Graftage
Hydraulics
Hydrogen Peroxide - metabolism
Key words: Catalase
Lignification
Lignin
Lignin - metabolism
Lycopersicon esculentum
Lycopersicon esculentum - enzymology
Lycopersicon esculentum - growth & development
Lycopersicon esculentum - ultrastructure
Microscopy, Electron, Scanning
peroxidase
Peroxidase - metabolism
Plant roots
Plant Roots - enzymology
Plant Roots - growth & development
Plant Shoots - enzymology
Plant Shoots - growth & development
Plants
Rootstocks
Scions
Time Factors
Tissue grafting
tomato
Xylem
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Summary:• 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.
ISSN:0305-7364
1095-8290
DOI:10.1093/aob/mch014