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Abstract
The emergence of lettuce (Lactuca sativa L. cvs. Grand Rapids and Mesa 659) seeds was enhanced by the pre-sowing permeation via acetone of growth regulators into the dry seeds. Emergence of photosensitive ‘Grand Rapids’ seeds from soil medium at moderate temperatures (20-18°C) was enhanced by permeation with gibberellic acid (GA3) alone. At supraoptimal soil temperatures, emergence of both cultivars was enhanced most effectively by a combination of GA3, kinetin and (2-chloroethyl phosphonic acid) ethephon).
in
HortScience