三种沙拐枣种子休眠原因研究初报  

Causes of Seed Dormancy of Three Species of Calligonum

作　　者：于卓[1] 王林和[1] 

机构地区：[1]内蒙古林学院沙漠治理系

出　　处：《西北林学院学报》1998年第3期9-13,共5页Journal of Northwest Forestry University

摘　　要：对三种沙拐枣种子的休眠原因进行了分析。它们的种子休眠率均高于９５％，休眠程度很深。种子活力高达９３％左右，它不是种子发芽率低的原因。种子（或果实）在室温下清水浸泡２４ｈ后均能吸水膨胀，其形态构造有利于吸水和气体（Ｏ２）交换，本身不存在环境休眠。通过生物鉴定发现，引起种子休眠的重要原因是果皮和种子内含有水溶性萌发抑制物。Causes of the seed dormancy of 3 species of Calligonum were analysed. Their seed dormancy rates were more than 95%, and the dormant degrees were rather deep. The seed vigor was as high as 93% or so, which was not the sause of the low seed germination rate. The evironmental dormancy of the seeds did not exist because all the seeds (or fruits)can absorb water and expand after having been soaked in water for 24 hours under indoor temperature, and their morphology and structure are favorable to water absorbing and gas(O 2). exchanging. It was discoveried through biotic identification that the major cause resulting in seed dormancy is water soluble germination inhibition substances contained in peels and seeds.

关 键 词：沙拐枣 种子 休眠 萌发抑制物 发芽率 

分 类 号：S793.104[农业科学—林木遗传育种]