Effects of water suspension and wet-dry cycling on fertility of Douglas-fir pollen.

Donald L. Copes; Nan Vance

doi:10.2737/PNW-RN-527

Treesearch

Effects of water suspension and wet-dry cycling on fertility of Douglas-fir pollen.

Informally Refereed

Authors:

Donald L. Copes, Nan Vance

Year:

2000

Type:

Research Note

Station:

Pacific Northwest Research Station

DOI:

https://doi.org/10.2737/PNW-RN-527

Source:

Res. Note PNW-RN-527. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 9 p

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Abstract

Studies were made to determine how long Douglas-fir pollen remains viable after suspension in cool water form 0 to 34 days. Linear regression analysis of in vivo and in vitro tests indicated that filled seed efficiency and pollen viability, respectively, decreased about 3 percent per day. The relation may have been nonlinear the first 6 days, as little decrease occurred during that time. An in vitro test of the effect of none, one, or two drying cycles on previously wetted pollens revealed a great decrease in pollen viability after just one drying cycle. The in vivo test of 1-, 2-, and 3-percent pollen suspensions showed that the 3-percent suspension resulted in 15 percent greater filled seed efficiency than the 2-percent and 57 percent greater than the 1-percent suspension.

Keywords

Supplemental mass pollination, seed orchard, flowering, reproduction, filled seed efficiency, Douglas-fir, Pseudotsuga menziesii

Citation

Copes, Donald L.; Vance, Nan C. 2000. Effects of water suspension and wet-dry cycling on fertility of Douglas-fir pollen. Res. Note PNW-RN-527. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 9 p