Author: Zaerr, Joe B.

Source: Forest Science, Volume 28, Number 2, 1 June 1982 , pp. 219-222(4)

Publisher: Society of American Foresters

Abstract:

Biologically active compounds such as growth hormones often are not identified for trees because only a small quantity of sap is available for analysis. Therefore, a large pressure chamber was designed, constructed, and used to collect xylem sap from sapling-sized Douglas-fir and western hemlock trees or branches. Highest sap yield was obtained in spring and lowest yield in winter. More sap was obtained from trees under higher water potential (low moisture stress). For 53 Douglas-fir trees, average yield was 58 ml, or about 81 ml/h; the maximum volume obtained from one tree was 180 ml. Application of this device, now used successfully for several years, should stimulate plant hormone research in conifers. Forest Sci. 28:219-222.

Keywords: Douglas-fir; western hemlock; cherry; poplar; water potential; extrudate; hormones

Document Type: Miscellaneous

Affiliations: 1: Professor, Department of Forest Science, Oregon State University, Corvallis, OR 97331

Publication date: 1982-06-01

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