太原黄耆(豆科)花器官及胚珠发育研究  

Floral and Ovular Development in Astragalus taiyuanensis S.B.Ho

作　　者：周晶[1] 赵亮[1] 江丹丹[1] 常朝阳[1] 

机构地区：[1]西北农林科技大学生命科学学院,陕西杨陵712100

出　　处：《西北植物学报》2016年第2期296-302,共7页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金(30270106;30870155)

摘　　要：太原黄耆是新近发表的物种,分布于中国陕西和山西。该实验利用扫描电子显微镜对太原黄耆的花器官发生和发育过程进行观察研究。结果显示:(1)太原黄耆的各轮花器官都是从远轴端向近轴端单向连续发生,在不同轮之间存在花器官重叠发生的现象。(2)在花的发育过程中,出现2种共同原基,即初级共同原基和次级共同原基,由初级共同原基发育成对萼雄蕊原基和次级共同原基,再由次级共同原基发育成花瓣原基和对瓣雄蕊原基。(3)雄蕊管近轴端基部开口是在进化过程中产生的特殊结构,是一种对传粉者的适应机制,从而有利于传粉活动的进行。(4)胚珠为倒生胚珠,具有2层珠被,认为倒生胚珠是内外2层珠被共同作用的结果。Astragalus taiyuanensis was newly found,which was only located in Shanxi and Shaanxi Province of China.Floral organogenesis and development in A.taiyuanensis were studied by means of scanning electron microscopy.Results were as followed：（1）sepals,petals,outer stamens,and inner stamens were formed unidirectionally in each whorl from the abaxial to the adaxial sides of the flower.Overlap in starting time between members of adjacent whorls occured.（2）The existence of two forms of common primordia,categorized as primary and secondary,was observed.Primary common primordia develop into antesepalous stamens and secondary common primordia.In comparison,the five secondary common primordia subdivide into apetal and an antepetalous stamen primordia respectively.（3）Filament tube had two adaxial fenestrations at base,which was adaptation to the pollinators and in favor of pollination activities.（4）Ovules were anatropous and bitegmic in A.taiyuanensis.Anatropous ovules was a result of the appearance of both inner and outer integuments.

关 键 词：黄耆属 花发育 共同原基 胚珠发育 

分 类 号：Q248[生物学—细胞生物学] Q944.58