Effect of Temperature and Kinetin on the Germination and Endogenous Hormones of Hyoscyamus muticus Seeds

Germination of Hyoscyamus muticus L. seeds was investigated under different temperature, light and kinetin treatments. Diurnal temperature fluctuation of 25°C for 14 h and 5°C for 10 h, strongly promoted germination. Kinetin (60 mg/1) substituted for the periodic temperature changes. Both kinetin and diurnal temperature fluctuation increased the IAA level in the seeds prior to germination. A natural inhibitor (Rf 0.6–0.8) did not disappear in response to either treatment.