光皮树小孢子发育与花器形态相关性及花粉粒超微结构观察  

Relativity between Cornus wilsoniana microsporogenesis period and the form of floral organ' and morphologic observation of pollen grain

作　　者：周娟[1] 蒋丽娟[1] 李昌珠[2] 马倩[1] 

机构地区：[1]中南林业科技大学,湖南长沙410004 [2]湖南省林科院,湖南长沙410004

出　　处：《中南林业科技大学学报》2011年第7期109-114,共6页Journal of Central South University of Forestry & Technology

基　　金：国家林业公益性行业科研专项项目(201004071);国家"十一五"科技支撑项目(2007BAD41B01)

摘　　要：对光皮树小孢子发育特点及其与花器外部形态的相关性进行研究,同时观测不同无性系花粉粒的超微结构。结果表明:光皮树小孢子属正常双子叶植物小孢子发育,发育过程分为花粉母细胞时期、四分体时期、单核细胞和双核细胞时期;小孢子发育与花器外形发育存在一定的相关性,花序/花蕾大小随着小孢子的发育而增大,花蕾的颜色随着小孢子的发育由花粉母细胞时期的深绿色变为后双核细胞时期的白色。光皮树花粉粒为长球形,赤道面观为四角形,极面观为三裂近圆形、略呈三角形,萌发孔为沟状,有3条孔沟,花粉粒外壁表面有雕纹,为疏密不一致的小穴,不同无性系之间花粉粒的超微结构差异不显著。The relativity of the microsporogenesis and the corresponding exterior morphological development of floral organ were studied, meanwhile the scanned morphological structure of pollen grain from different clones was observed by scanning electron microscope. The results show that the microsporogenesis of Comus wilsoniana was normal dicotyledon microsporogenesis, there were four development periods： microsporocyte, tetrad, monocyte period and binucleate cells period; the microsporogenesis development period was related to the changes of floral organ morphology. During the process of microsporogenesis, the size of inflorescences and the buds increased following the microsporogenesis, and the colour of buds changed from black green in microsporoeyte period to white in the binucleate cells period. Commonly pollen grain of Comus wilsoniana was prolate, which is quadrilateral by the equatorial plane view, and suborbicular of three stomium or slight trilateral by the polar view, similar furrow, there were three germinal pore furrows, sculpture of grain exine were little caves distributing unevenly, However ultra microstructure of pollen grain from diffent clones of Comus wilsoniana was a little difference.

关 键 词：光皮树 小孢子发育 花器形态 花粉粒 

分 类 号：Q969.763.4[生物学—昆虫学]