我国特有珍稀花卉植物蝟实生殖生物学特性研究  

Studies on Reproductive Biology Characteristics of Kolkwitzia amabilis,an Endemic to China

作　　者：李智选[1] 石建孝[1] 

机构地区：[1]西北大学生命科学学院,西部资源生物与现代生物技术省部共建教育部重点实验室,陕西西安710069

出　　处：《华北农学报》2009年第B08期327-330,共4页Acta Agriculturae Boreali-Sinica

基　　金：国家科技基础条件平台建设专项基金(2005DKA);陕西省教育厅自然科学基金(06JK174)

摘　　要：通过用石蜡切片、扫描电子显微镜以及数量统计与分析的方法,研究蝟实大孢子发生及其雌配子体发育的特征;种子发育特点以及种子在果实中发育的数量变化。结果表明:其胚珠倒生,薄珠心,单珠被,大孢子四分体呈直线排列,功能大孢子位于合点端。胚囊发育类型属于蓼型。蝟实的胚胎学特征与忍冬科的胚胎学特征基本相同;在植株上种子胚的发育停留在鱼雷型胚时期,这属于种子的后熟现象。得出的结论是:蝟实胚发育停留在鱼雷型胚时期,种子发育不完全及败育率非常高(61.86%)是影响蝟实繁育的主要内因,也是蝟实稀有及孤岛状分布的原因。Kolkwitzia amabilis, an endemic species to China, we studied reproductive biology characteristics of it through paraffin sectioning and scanning electron microscopy. That contains ： the characteristics of its megasporogenesis and development of the female gametophyte; the characteristics of development of the seed and the quantity movement of the seed among its development. The results showed that the ovule was anatropous, unitegmic and tenuinucellate type; the megaspore develop into a linear tetradas. The chalazas megaspore were a functional one, which develops into a polygonum type of embryo sac. The embryological characteristics of K. anmabilis were very similar to those of Caprifoliaceae. The embryo was depauperatus and remains at torpedo-stage embryo in the seed of it, possibly, which was afterripening phe- nomenon of the seed. The rate of abortive seed was 61.86%, and it perhaps major unit causation that affect breeding po- tential of Kolkwitzia amabilis. And it may be the major causation of that it＇s rare and isolated island shape distribution.

关 键 词：稀有植物 蝟实 生殖生物学 发育 

分 类 号：Q948.2[生物学—植物学]