纳罗克非洲狗尾草种子休眠人工破除方法  

Seed treatments to release dormancy of Setaria sphacelata cv.‘Narok'

作　　者：罗富成[1] 段新慧[1] 彭健[1] 杨超[1] 许文花[1] 郭轶敏[1] 郭凤根[1] 

机构地区：[1]云南农业大学动物科技学院草业科学系,云南昆明650201

出　　处：《草业科学》2014年第2期256-263,共8页Pratacultural Science

基　　金：国家自然科学基金项目"纳罗克非洲狗尾草种子休眠机理及解除方法研究"(31260582)

摘　　要：纳罗克非洲狗尾草(Setaria sphacelata cv.Narok)是我国南方广大地区草业生产和生态环境建设的优良禾草之一。但其种子产量低,休眠程度深,严重限制了该牧草的推广利用。本研究采用机械处理、KNO3溶液浸种、H2SO4溶液腐蚀种壳、HCl溶液浸种4种方法破除纳罗克非洲狗尾草种子的休眠,结果表明,4种处理方法均可不同程度破除其休眠,其中去除稃片后再刺破种皮、25%HCl溶液浸种4min为本研究中处理效果较好的方法。前者种子的发芽势为32%,发芽率为33%,发芽指数为8.85,活力指数为0.012 0;后者的分别为31%、35%、8.47和0.014 3,均显著高于对照(P<0.05),但彼此之间无显著差异(P>0.05)。Setaria sphacelata cv. Narok is one of the most popular forages applied in grassland production and ecological environment construction in southern China. However, the low seeds production and deep dormancy restrict the popularization and utilization of this forage. Four different methods including mechanical treatment and various chemical treatments were applied to break dormancy of Narok seeds from Yunnan Province. The results showed that all of these four different treatments could break Narok seed dormancy with varied effects. The treatments of piercing skin after removing shell and soaking in 25% HCl solution for four minutes were more useful than the others. The germination potential, germination rate, germination index and the vigor index of piercing skin after removing shell was 32%, 33%, 8.85 and 0.012 0, respectively, and these four indices of soaking in 25% HCl solution for four minutes was 31%, 35%, 8.47 and 0.014 3, respectively. The indices of these two treatments were significantly higher than the corresponding index from control（P〈0.05）, but there was no significant difference between each other （P〉0.05）.

关 键 词：纳罗克非洲狗尾草 机械处理 KNO3处理 H2SO4处理 HCl处理 

分 类 号：S544.3[农业科学—作物学]