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《Chinese Journal of Ecology》 2014-09
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Effects of light and cold storage on seed germination of three shrub species from the eastern Qinghai-Tibet Plateau

CUI Xian-liang;LUO Ya-ting;JIANG Zhi-lin;SU Zhi-long;Li Sun-yang;LUO Yin-ling;College of Biology and Chemistry,Puer University;  
The fresh mature seeds of three shrubs( Philadelphus incanus,Spiraea alpine and S.rosthornii) were collected from the eastern Qinghai-Tibet Plateau. After the seeds were stored at5 ℃ for different time( 0,40,80 and 160 d),they were used for germination under 5 ℃ /25 ℃and 12 h /12 h photoperiod in a growth incubator. In addition,the seeds naturally dehydrated at room temperature for 120 d were used for germination at 10 ℃ /25 ℃ under five light conditions( white light,dark,red light,blue light,12 h/12 h light/dark). Cold storage time had significant effects on the germination of the seeds of the three shrub species. Cold storage improved the germination ability of P. incanus and S. rosthornii,but reduced the germination ability of S. alpine. There were very significant differences in germination percentage among different light conditions for P. incanus seeds. The highest germination percentage and fastest germination rate were recorded under red light and 12 h /12 h light /dark,and the lowest germination percentage and slowest germination rate were found under dark and blue light. Seeds of S. rosthornii exhibited significant differences in germination percentage and germination rate among the different light conditions. The germination percentages under white light,red light,blue light,and 12 h /12 h light /dark were all more than 80%,and were significantly higher than that under dark. The germination rate was fastest under red light,and lowest under blue light. There were no significant differences in germination percentages among the different light conditions for S. alpine seeds.The germination percentages under all light conditions were more than 93%. But S. alpine seeds germinated fastest under red light and dark,while lowest under blue light. The results indicated that cold storage,as a dormancy breaking treatment,had different effects on seed germination for diversified species; however,as a trigger factor of germination,red light had consistent effects on seed germination among different species.
【Fund】: 国家自然科学基金项目(31360059、31360456和31060252);; 云南省教育厅科学研究基金项目(2011C193)资助
【CateGory Index】: Q945.34
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