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AbStlWt The upward movement of &orbed salts within plant ia innuaced by the transpiration stream. This study tested the hypothesis that transpiration by winterfat mother plants effects seedling vigor. Mature plants, growing in a greenhouse, were exposed to forced air and measurements were made on water loss from the plants, concentrations of Ca*, MI’+, Na+, and K+ in the diaspores, 8nd on offepring growth par8meters. The dixsporee produced by the plants were germinated and grown under 2 identical temperature regimes, except that 1 regime included 1 hour of dark-period freezing strew. The forced-air treatment had no detectable effect on mother plants, including no significant (pIO.05) effect on water loss or on cxtion concentrations in the diespore. However, it did signlflcantly decrease offspring vigor. Analysis of the total test-plant population revealed significant, linear relationships between water loss and: diespore yield, Ca* and K+ concentrations in the &pore, seedUng dry weight, and seedling hypocotyl length. Liacu relationships between seedling variables and covariables provided evidence that Ca*, K+ and Na+ influence seedling weight, moisture, and hypocotyl length. It is concluded that mother-plant transpiration, windstress, and nutrition affect offspring vigor.

Seedbed Ecology of Winterfat: Effects of Mother-Plant Transpiration, Wind Stress, and Nutrition on Seedling Vigor