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《Journal of Chongqing Normal University(Natural Science)》 2011-06
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Effects of Temperature,Stress Induced by PEG-8000 and NaCl Solutions on Seed Germination of Plantago minuta(Pall)

TIAN Mei-hua,TANG An-jun(College of Life Sciences,Chongqing Normal University,Chongqing 400047,China)  
The present study aimed at investigating dormant characteristics and responses to germination temperature,drought and salt stress of Plantago minuta seeds.Freshly harvested seeds of P.minuta did not germinate well and showed innate dormancy at broad range of constant temperatures(10,15,20,25 and 30 ℃) and an altering temperature of 25/15 ℃ with a 12 h photoperiod.However,the dormancy was broken after 60 d dry storage at 4 ℃.Obviously,the germination was temperature-dependent and the optimum temperature was 20 ℃ with the germination of 97% in light.Also,the decrease in the final germination percentages was observed with increase in concentration of both PEG-8000 and NaCl solutions.It suggested that P.minuta produces innate dormant seeds and develops its unique ecological adaptation although this species is able to tolerate weak salt stress and water deficiency.Based on these results above,it could be inferred that the particular dormant characteristics and germination pattern underlie its adaptation to the desert environment and evolve in the field.Moreover,P.minuta has an escape strategy for a short life history which often ends at the beginning of badly natural drought in the habitat.
【Fund】: 重庆市教委科研项目(No.KJ100610);; 重庆师范大学博士启动金项目(No.09XLB016)
【CateGory Index】: Q945
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