ISHS Acta Horticulturae 550: XVIII International Symposium on Virus and Virus-like Diseases of Temperate Fruit Crops - Top Fruit Diseases
HISTOLOGICAL MANIFESTATION OF RUBBERY WOOD SYMPTOM IN APPLE TREES |
| Authors: | R. Fialová, M. Navrátil, R. Podsedníková |
| Keywords: | Malus pumila, Secondary xylem, Wood constituent elements, Light microscopy |
| Abstract:
Apple rubbery wood is a graft transmissible disease exhibiting an extreme flexibility of stems and branches. Using light microscopy, structure and staining properties of the secondary xylem from rubbery branches of diseased apple trees (Malus pumila) were compared with parameters of the corresponding tissue of normal branches of control apple trees. The results indicate that insufficient and uneven lignification as a main mechanism of the flexibility of rubbery wood branches was accompanied with qualitative and quantitative structural changes of xylem. The rubbery wood pattern can be characterised by a higher proportion of parenchymatous constituent elements and by a high degree of the tissue heterogeneity, including conspicuous structural abnormalities. | |
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