Radially Sectored Hydraulic Pathways in the Xylem of Thuja occidentalis as Revealed by the Use of Dyes
| Autor: | I J. Doubt, D. W. Larson, U. Matthes-Sears |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | International Journal of Plant Sciences. 155:569-582 |
| ISSN: | 1537-5315 1058-5893 |
| DOI: | 10.1086/297195 |
| Popis: | Thuja occidentalis shows slow growth, strip-bark morphology, and extreme longevity when growing on cliffs of the Niagara Escarpment, Ontario, Canada. To test whether these features could result from sectored radial architecture, dye-infusion experiments were performed on trees in four different age/size categories. Safranin and/or crystal violet were infused for up to 2 wk into young lateral roots. Plants were then harvested, serial-sectioned, and photographed. When two dyes were infused simultaneously, different lateral roots were used. Trees were also infused with dye, wounded, and then resupplied with dye to determine whether hydraulic pathways were altered as predicted by commonly accepted models. The results showed rapid radially sectored dye uptake in trees older than 1 yr. Individual roots tended to supply dye to only part of the crown. Wounding had no influence on the pattern of dye distribution. Stem segments with opposing, overlapping, and adjacent saw cuts had hydraulic conductance values near ... |
| Databáze: | OpenAIRE |
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