Korkmaz, A., Tiryaki, I., Nuri Nas, M. and Ozbay, N. 2004. Inclusion of plant growth regulators into priming solution improves low-temperature germination and emergence of watermelon seeds. Can. J. Plant Sci. 84: 1161-1165. The effects of incorporating plant growth regulators into the priming solution on low temperature germination and emergence performance of watermelon [Citrullus lanatus (Thunb.) Matsum. & Nakai. cv. Crimson Sweet] seeds were investigated. Seeds were primed in 2.5% (0.25 M) KNO3 solution for 6 d at 25degreesC in darkness containing one of the following: 1, 3 or 5 muM methyljasmonate (MeJA), or 1, 3 or 5 mM spermine. Following priming, seeds were subjected to germination and emergence tests at 15degreesC. Priming watermelon seeds in the presence or absence of plant growth regulators significantly improved germination percentage and rate at 15degreesC compared to untreated seeds, which failed to germinate. Seeds primed in KNO3 solution containing 1 or 3 muM of MeJA had significantly higher germination percentages, 96 and 85%, respectively, compared to seeds primed in KNO3 only (69%). Germination rate and synchrony were improved by 1 and 3 muM of MeJA added to the priming solution. Emergence was enhanced by priming seeds in the presence of 1 muM (75%) and 3 muM (63%) MeJA compared to seeds primed in KNO3 solution, (35%) while non-primed seeds were unable to emerge at 15degreesC. Inclusion of spermine at all three concentrations into the priming solution did not significantly improve germination and emergence characteristics of watermelon seeds compared to seeds that were primed in KNO3 solution only. Therefore, priming watermelon seeds in 1 or 3 2muM of MeJA incorporated into the KNO3 solution can be used as an effective method to improve low temperature performance of watermelon seeds.