濒危物种德保苏铁种子萌发特性研究  

The Study on the Seed Germination of Endangered Species Cycas Debaoensis

作　　者：王莉芳[1] 欧蒙维[1] 谭艳芳[1] 

机构地区：[1]中国科学院广西植物研究所,广西桂林541006

出　　处：《种子》2014年第2期26-29,共4页Seed

基　　金：中国科学院战略生物资源技术支撑体系专项运行经费项目资助

摘　　要：研究了德保苏铁种子萌发的生物学特性,以了解该物种种群自然更新困难的原因和机制.结果表明,德保苏铁种子萌发的比较适宜的浸泡水温为25℃、30℃,对应萌发率分别为40％、46.67％,在20℃和35℃条件下,萌发势和萌发率均较低.温度在20 ～ 35℃之间,种子均有不同程度萌发,但在25℃、30℃时,其萌发率较高,分别为86.67％、93.33％.种子去皮比不去皮起始萌发时间短及萌发势要高.不同贮藏方式处理后,起始萌发时间提前的是泥土层积贮藏,在萌发率上低温贮藏最高,为73.33％,其次是泥土贮藏,其萌发率为66.67％.德保苏铁种子在合适的条件下萌发速度快,萌发比较整齐,使其在种间竞争中处于有利地位,且种子萌发对温度的适宜范围比较宽,再加上自然条件下种子有一定的萌发率,说明这些因素不是导致德保苏铁濒危的主要原因.In order to understand the reason and mechanism of the natural regeneration of C. debaoensis, its biological characteristics of seed germination was studied. The optimal temperature for the seed germination of C. debaoensis were 25 ℃ and 30 ℃ ,the germination rate was 40% and 46.67%. At 20 ℃ and 35 ℃ ,both the germination energy and the germination rate were low, at 20 -35 ℃, the seeds of C. debaoensis could germinated in different degree. At 25 ℃ and 30 ℃ ,the germination rate were 86.67% and 93.33%. Peeled seeds had higher germination potential than seeds with not peel. The initial germination time was ahead of schedule in soil layerproduct storage. The germination rate was highest with a germination rate 73.33% in low temperature treatments. The germination rate was 66.67% in soil layer storage. The seed germination speed of C. debaoensis was quick and neat, the seed germination had a wide suitable range and it could germinated in natural condition. These showed that the above factors were not the main cause that C. debaoensis became endangered species.

关 键 词：濒危植物 德保苏铁 种子 萌发特性 

分 类 号：Q948[生物学—植物学] S791.11[农业科学—林木遗传育种]