西伯利亚红松与红松种子形态、种皮显微构造的比较研究

编号 zgly0000303430

文献类型 期刊论文

文献题名 西伯利亚红松与红松种子形态、种皮显微构造的比较研究

学科分类 220.99;林学其他学科

作者 毛子军  袁晓颖  祖元刚  赵光仪 

作者单位 东北林业大学 

母体文献 林业科学 

年卷期 2003,39(4)

页码 155-158

年份 2003 

分类号 S791.247 

关键词 西伯利亚红松  种子形态  种皮  显微构造 

文摘内容 Normal experiment methods and electron microscope scanning technique were used to compare the differences of the seed morphological characteristics and microstructure of the seed coats between Pinus sibidca and P. koraiensis.The purpose of this study is to clarify the dormancy and germination characteristics and mechanism of the seeds of P. sibir-ica. The results showed that the thousand-grain weight of the measured seeds of P. sibidca was only 39.9% and 48.5% of that of P. koraiensis. The weight of outer seed coats of P. sibidca was 54.04% and 52.6% of their whole seed weight, which was lighter than that of P. koraiensis, while the weight of the seed coat of P. koraiensis was of 61.7% of their whole seed weight. Five layers were seen at the cross section of the hard seed coat of P. koraiensis under scanning electron microscope: external seed epidermis layer (external seed coat), epidermis layer, dense lithocyte layer, palisade layer and inner epidermis. There were four layers in the seed coat of P. sibirica : the external epidermis layer, epidermis layer, palisade layer, and inner epidermis.Thickness of outer seed coat of P. sibirica and P.koraiensis was 400 μm and 1 200—1 300 μm respectively. All these characteristics showed a big hindrance and the permeability barrier in the seed coat of P. sibirica, but not stronger than that of P. koraiensis。