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。

关键词: 稀有植物, 蝟实, 生殖生物学, 发育

Abstract: Kolkwitzia amabilis,an endemic species to China ,we studied reproductive biology characteristics of itthrough paraffin sectioning and scanning electron microscopy .That contains :the characteristics of its megasporogenesis anddevelopment of the female gametophyte ;the characteristics of development of the seed and the quantity movement of theseed among its development .The results showed that the ovule was anatropous,unitegmic and tenuinucellate type ;themegaspore develop into a linear tetradas .The chalazas megaspore were a functional one ,which develops into a polygonumtype of embryo sac .The embryological characteristics of K .amaabilis were very similar to those of Caprifoliaceae .Theembryo was depauperatus and remains at torpedo -stage embryo in the seed of it,possibly ,which was afterripening phenomenonof the seed .The rate of abortive seed was 61 .86 %, and it perhaps major unit causation that affect breeding potentialof Kolkwitzia amabilis .And it may be the major causation of that it′s rare and isolated island shape distribution .

Key words: Rareplant, Kolkwitziaamabilis, Reproductivebiology, Development

中图分类号: 

• Q948.2