疏花蒺藜草种子发芽习性差异的研究  

Research on the behavior differences in seed germination of Cenchrus pauciflorus

作　　者：韩成莲[1] 杨新芳[1] 王莹[2] 王大宝[1] 赵东旭[1] 

机构地区：[1]北京理工大学生命学院,北京100081 [2]暨南大学生命科学与技术学院,广东广州510632

出　　处：《草业科学》2011年第5期793-796,共4页Pratacultural Science

基　　金：北京理工大学2009年度生态科考项目

摘　　要：为了解疏花蒺藜草(Cenchrus pauciflorus)刺苞中的两粒种子在相同条件下萌发习性的差异,测定完整种子、带颖片的种子、裸种子的发芽率,干旱条件下的完整种子的发芽率及不同包被状态下种子的吸水率;同时还观察完整种子中大、小种子的发芽顺序。结果表明,在适宜的条件下,部分完整种子中的两粒种子均能发芽,大种子先于小种子发芽,且大、小种子的发芽率分别为85.00%、59.64%;而大、小裸种子的发芽率则相同,均为88.13%。当发芽过程中水分不足时,完整种子中大种子的发芽率几乎不受影响,而小种子则完全不发芽。吸水率测定结果表明,不同包被状态下大种子的吸水能力优于小种子。刺苞中两粒种子发芽存在差异,部分原因是由于小种子吸水受到限制引起的。In order to understand the behavior differences in germination of two seeds, grown in a single thorn wrap, of Cenchrus pauciflorus under same conditions, the germination rates of complete seeds, seeds with glumes, bare seeds were measured. The germination rate of complete seeds in dry conditions and the water-absorbing rate of different packaging seeds, the germinating order of big and small seeds in the single thorn wrap were also tested. Results from the study showed that two seeds in the most single thorn wrap could germinate under suitable condition, and the big seeds germinated earlier than the small seeds, while the germination rates of big seeds and small seeds were 85.00% and 59.64%, respectively. Under the same conditions, the germination rate of the two sorts of naked seeds was same, 88.13%. The germination rate of the big seeds was almost not affected by the condition of water-supplying insufficiency, but the small seeds could germinate hardly. The rate of water-absorption showed that water-absorbing ability of the big seeds was stronger than that of the small seeds under different package （complete seeds or seeds with glumes）. The difference of seed germination between the big and the small seeds was mainly caused by limited water-absorption.

关 键 词：疏花蒺藜草 干旱 萌发率 种子异质性 

分 类 号：S451[农业科学—植物保护]