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 AJPS  Vol.5 No.15 , July 2014
Germination of Encholirium spectabile Mart. ex Schult. & Schult. f. Seeds in Response to Temperature and Water Stress
Abstract: A study was conducted to examine the effects of different temperatures and water stress on Encholirium spectabile seeds. We evaluated the germination percentage, speed and time of germination of small (<2.97 mm), medium (2.97 ≤ M ≤ 4.01 mm) and large seeds (>4.01 mm), at temperatures of 15°C, 20°C, 25°C, 30°C, 35°C, 40°C and 45°C and a photoperiod of 12 hours of light. Seeds were subjected to osmotic potentials of 0, -0.2, -0.4, -0.6, -0.8, -1.0, -1.2 and -1.4 MPa, induced by solutions of polyethylene glycol. The results indicated an excellent germination of medium and large seeds at the temperatures of 20°C, 25°C, 30°C and 35°C. The temperature of 35°C provided the best mean germination time of large seeds and a higher speed rate of medium and large seeds. E. spectabile seeds germinate in a wide range of water deficit of -0.2 to -1.2 MPa. Germination reduced at concentrations of -1.0 and -1.2 MPa. No germination occurred at -1.4 MPa. Larger seeds showed the higher germination potential than medium and small seeds at the temperatures of 25°C, 30°C and 35°C and in the range ofwater deficit of -0.2 to -1.2 Mpa. 
Cite this paper: Figueiredo, M. , Barboza Nogueira, F. , Pinheiro, C. , Freire de Brito, S. and Medeiros Filho, S. (2014) Germination of Encholirium spectabile Mart. ex Schult. & Schult. f. Seeds in Response to Temperature and Water Stress. American Journal of Plant Sciences, 5, 2237-2246. doi: 10.4236/ajps.2014.515238.
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