Abstract
When lettuce seeds are imbibed and subjected to high temperature for periods of 72 h or more, dormancy known as thermodormaney is induced. Priming of three cultivars of lettuce (Lactuca sativa L.) seeds in 1% (w/v) K3 P O4 for 20 h in the dark reduced thermodormaney. Addition of 100 mg 6-benzyladenine (BA)/liter to the priming solution increased germination in petri dishes at 35C in `Green Lakes' from 65% in seeds that were primed without BA, to 92% when BA was added to the priming solution. In `South Bay' these percentages were 24% and 86%, respectively. Seedling emergence was improved in other lots of `Green Lakes' and `Montello' using soilless mix.
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