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) KNO 3 solution for 6 d at 25°C in darkness containing one of the following: 1, 3 or 5 µM methyl jasmonate (MeJA), or 1, 3 or 5 mM spermine. Following priming, seeds were subjected to germination and emergence tests at 15°C. Priming watermelon seeds in the presence or absence of plant growth regulators significantly improved germination percentage and rate at 15°C compared to untreated seeds, which failed to germinate. Seeds primed in KNO 3 solution containing 1 or 3 µM of MeJA had significantly higher germination percentages, 96 and 85%, respectively, compared to seeds primed in KNO 3 only (69%). Germination rate and synchrony were improved by 1 and 3 µM of MeJA added to the priming solution. Emergence was enhanced by priming seeds in the presence of 1 µM (75%) and 3 µM (63%) MeJA compared to seeds primed in KNO 3 solution, (35%) while non-primed seeds were unable to emerge at 15°C. 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 KNO 3 solution only. Therefore, priming watermelon seeds in 1 or 3 µM of MeJA incorporated into the KNO 3 solution can be used as an effective method to improve low temperature performance of watermelon seeds. Korkmaz, A., Tiryaki, I., Nuri Nas, M. et Ozbay, N. 2004. L'inclusion d'un régulateur de croissance à la solution de préger-mination améliore la germination et la levée des graines de pastèque à basse température. Can. J. Plant Sci. 84: 1161-1165. Les auteurs ont tenté de voir quelle incidence l'incorporation d'un régulateur de croissance à la solution de prégermination pour-rait avoir sur la germination et la levée des graines de pastèque [Citrullus lanatus (Thunb) Matsum. & Nakai. cv. Crimson Sweet] à basse température. Pour cela, ils ont trempé les semences dans une solution de KNO 3 à 2,5 % (0,25 M) à une température de 25 °C dans l'obscurité, pendant six jours. La solution contenait aussi 1, 3 ou 5 µM de jasmonate de méthyle (MeJA) ou 1, 3 ou 5 mM de spermine. Après trempage, on a soumis les graines de pastèque à des essais de germination et de levée à 15 °C. La préger-mination avec ou sans régulateur de croissance améliore sensiblement le pourcentage et le taux de germination à 15 °C, compar-ativement aux graines non traitées, qui ne germent pas. Les graines trempées dans le KNO 3 enrichi de 1 ou 3 µM de MeJa ont donné un pourcentage de germination nettement plus élevé (96 % et 85 %, respectivement) que celles trempées uniquement d...