Effets de quelques prétraitements physico—chimiques sur la levée de l'inhibition tégumentaire des graines de Retama monosperma Boiss. et recherches des conditions thermiques optimales de germination

Abstract

Seeds of Retama monosperma are affected by integumentary inhibition preventing their germination in the natural conditions. In the laboratory, the germination is triggered after chemical scarification of seeds by undiluted sulfuric acid, in a range of temperatures, between 10 °C and 30 °C. The principal component analysis of data relating to the capacity of germination, coefficients of velocity and latency time obtained after pretreatment with sulfuric acid for 4, 6 and 8 hours, tested at different temperatures, show that the optimum thermal germination is between 20 °C and 25 °C. Indeed, at these two temperatures, we recorded the best coefficients of velocity (23.25% to 31.81%), germination capacity (72% to 92%) and the shortest latency time (1 to 2 days).