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Histological Changes Associated with the Graft Union Development in Tomato
Carlos Frey1, José Luis Acebes1, Antonio Encina1
1Departamento de Ingeniería y Ciencias Agrarias, Área de Fisiología Vegetal, Facultad de Ciencias Biológicas y Ambientales, Universidad de León, 24071 León, Spain.
Plants (Basel, Switzerland)
|November 6, 2020
Summary
Grafting in tomato involves significant anatomical changes at the graft junction, including cell wall thickening and new vascular tissue formation. Successful tomato grafts require proper vascular connection and adhesion line integrity.
Area of Science:
- Horticultural science
- Plant anatomy
- Plant physiology
Background:
- Grafting is vital in horticulture, yet the structural changes during graft establishment are poorly understood.
- Tomato (Solanum lycopersicum L.) grafting is widely used, necessitating research into its anatomical underpinnings.
Purpose of the Study:
- To investigate the time course of anatomical changes in tomato graft junctions.
- To compare structural development in functional homo- and heterografts versus non-functional grafts.
Main Methods:
- Histological techniques were employed to examine graft junctions.
- Analysis focused on the time course of structural changes in tomato homografts, heterografts, and non-functional grafts.
Main Results:
- Functional homo- and heterografts showed similar tissue development, including thickened cell walls and new vascular tissue formation.
- Adventitious roots emerged from the scion's vasculature; significant vascular connection was evident by 20 days.
- Non-functional grafts exhibited necrosis and cell wall deposition, hindering scion-rootstock connection.
Conclusions:
- Accurate changes in pre-existing vasculature and cell wall integrity at the adhesion line are critical for functional tomato grafts.
- Understanding these anatomical shifts can optimize grafting techniques in horticultural crops.
