摘要
首次详细报道了蚕茧草的异型花柱现象,研究表明,除了其雄蕊、柱头高度有二型性外,其花瓣大小、柱头形态、花粉粒大小、数量和种子质量也表现出明显的二态性。与短柱花相比,长柱花有较大的花瓣,其柱头有稀而高的柱头突起,其花药产生较多而直径较小的花粉粒。扫描电镜显示,长、短柱花的种子均卵形,无喙突,具有拟脑状纹饰;长、短柱花的花粉均为球形,具散孔,孔近圆形,边缘不规则,通过其花粉和种子微形态的观察,可将其划分为春蓼组。野外调查发现蚂蚁常常是其访花者。通过对其野生居群的型比调查发现在野外蚕茧草往往为单型居群,并通过对不同居群座果率的统计发现长柱花的结实率较大。根据其繁育系统特征,对其传粉适应方式进行了探讨。
Distyly was clearly confirmed in Polygonumjaponicum. Research showed that in addition to dimor phic stigma and anther heights, the sepals, stigmas, pollen size, number and quality of seeds are also dimor phic. Compared with the thrums, the pins had larger sepals, and the stigmas had fewer but higher papillae, producing significantly smaller pollen grains but in greater numbers. The seeds of the thrum and the pin were ovoid and had no beak but did have paraeerebroid omamentations. The pollen grains of the flower were spherical and suborbicular, with irregular margins and scattered holes. The micromorphological characteristics of pollen and seed supported P. japonicum belongingto the Persicaria-type. Ants were the main visitors to the flowers. P. japonicum often occured as a single population with greater setting rate of pin. The adaption of P. japonicum through its breeding system characteristics are discussed.
出处
《草业学报》
CSCD
北大核心
2013年第3期196-203,共8页
Acta Prataculturae Sinica
基金
安徽省自然科学基金(11040606M72)
安徽高校省级自然重点项目(KJ2012A130)
安徽师范大学重点实验室和重点学科开放基金资助
关键词
蚕茧草
异型花柱
微形态
访花者
Polygonumjaponicum
distyly
micromorphology
flower visitor
作者简介
吕奉菊（1984-），女，山东莱芜人，在读硕士。Email：lvfengjv435@163．com
通讯作者。Email：chenminlin0553@yahoo．com．cn
