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Xylem-fed maple sap accelerates balsam fir needle abscission and but can delay water loss in spring and autumn

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MacDonald M. T., Lada R. R., West R. R., Nelson K. L.

Dendrobiology

2016

tom 76

Postharvest balsam fir trees are known to suffer a number of problems that may be linked to abscission rates, such as dehydration or wounding. By definition, postharvest balsam fir trees are also detached from roots and will no longer be supplied certain root derived factors normally translocated via the xylem. Resupplying those root derived factors may delay abscission. The objective of this experiment was to take sap from a root intact species (i.e. Acer saccharum L) and add it to the water supply of balsam fir branches. Further, the effect of reverse osmosis and autoclaving the sap supply will be explored. The experiment was conducted once in spring and again in autumn to examine seasonal changes in needle abscission. The only hormones found in the maple sap were ABA and its metabolites, with PA (163.0 ng g–1) being the primary metabolite present. Needle retention was higher in branches harvested in autumn, as long as they were provided a sap that did not undergo RO. If the sap had undergone RO, then needle retention was slightly decreased in autumn. Needle retention generally decreased as the concentration of maple sap in the water supply increased and this trend was accelerated if the sap had undergone RO. Autoclaving the sap successfully delayed the length of time for water consumption to decrease, but this unexpectedly did not translate into improved needle retention.

Ograniczanie wyników

1 Dendrobiology

1 Lada R. R.

1 MacDonald M. T.

1 Nelson K. L.

1 West R. R.

1 2016

Wyniki wyszukiwania

Xylem-fed maple sap accelerates balsam fir needle abscission and but can delay water loss in spring and autumn