【摘要】 为了探索睡莲目与泽泻目个体发育早期的共性,追踪观察了大花睡莲种子至种苗的发育过程。结果发现:种子胚苗端发育先于根端;萌发时首先出现下胚轴,继而末端膨大产生下胚轴毛,最后胚根分化;初生根短命;节生根后发生但较粗壮,浮水叶开始产生时根茎第一节以下部分随即烂掉;种苗的各器官中均有发达的通气组织等基本上与芡、泽泻和黑藻相似。更多还原

【Abstract】 In order to probe into the common character of Nymphaeales and Alismatales in early stage of ontogeny,developmental process from seed to seedling of N.tetragona var.crassifolia was observed in this study.The shoot ends developments before the root ends in seed embryo.When the seed germinates,the hypocotyl appears firstly and swells around the end of it,and some hairs(hypocolyl hair) arise from the swelling.At the same time,the radicle begins to differentiate and grow up a primary root.The primary root is ephemeral but the nodal roots are long-lived and thicker.When the floating leaves emerge,the portion bellow the first node of rhizome is withered.Every seedling organs are of aerenchyma,etc.All of these characters are similar to Euryale ferox,Alisma orientale and Hydrilla verticillala.更多还原