Effects of KNO_3 pretreatment and temperature on seed germination of Sorbus pohuashanensis

编号 zgly0000818198

文献类型 期刊论文

文献题名 Effects of KNO_3 pretreatment and temperature on seed germination of Sorbus pohuashanensis

作者 BIAN  Lei  YANG  Ling  WANG  Jian-an  SHEN  Hai-long 

作者单位 School  of  Forestry  State  Key  Laboratory  of  Tree  Genetics  and  Breeding 

母体文献 林业研究: 英文版 

年卷期 2013(2)

页码 309-316

年份 2013 

分类号 S 

关键词 Sorbus  pohuashanesis  seed  dormancy  seed  germination  KNO3  pretreatment 

文摘内容 We characterized the effects of KNO3 pretreatment and germination temperature on dormancy breaking and germination of mature mountain ash seeds. Seeds treated with KNO3 and germinated at 25 ℃ followed by 5 ℃ had significantly higher germination percentages and germination potentials (51% and 49%, respectively), compared with controls. These treated seeds also exhibited reduced germination initiation times (minimum of 48 days), and elevated germination rate indices (up to 97). The germination of seeds subjected to long-term cold storage (2 years at 0-5 ℃) was also significantly improved by 3 days of 4% KNO3 pretreatment before germinating under a variable temperature regimen (5 ℃ followed by 25 ℃, and followed by 5 ℃). Germination percentages and germination potentials for these cold-stored seeds reached 67% and 54%, respectively, and the germination rate index increased to 126.99. Pretreatment of mountain ash seeds with KNO3 represents a practical, effective, and pollution-free method for improving germination, and can be implemented easily within a variety of nursery settings.