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应用显微技术对西瓜胚和胚乳的发育过程进行了观察并分析了西瓜胚珠败育的原因。西瓜胚发育属紫菀型。合子第一次分裂为不均等分裂 ,形成的基细胞体积明显较顶细胞大 ,两细胞均含有多个液泡。原胚发育过程中没有明显的胚柄。最外层的原胚细胞 ,与胚乳细胞相邻的壁上被胼胝质物质包围 ,且无外连丝存在 ;与胚囊壁相接的壁上无壁内突结构。胚的子叶体积增长的同时 ,子叶细胞内积累蛋白质和脂类物质 ,多糖物质的含量下降。胚乳发育属核型 ,在球形胚期开始自珠孔端向合点端细胞化 ,胚子叶分化出后开始自珠孔端向合点端退化。胚乳合点端在球形胚早期形成发达的胚乳吸器 ,开始呈游离核状态 ,后细胞化 ,在心型胚期之后退化。
The development of watermelon embryo and endosperm was observed by microscopy and the reason for the abortion of watermelon ovule was analyzed. Watermelon embryo development is a purple type. Zygote split for the first time into an unequal split, the formation of basal cell volume was significantly larger than the top cell, both cells contain multiple vacuoles. There are no obvious embryos in the process of embryo development. The outermost blastocyst, surrounded by callose material adjacent to the endosperm cell, is free of external filaments; the wall adjacent to the embryo wall is free of wall-inburst structures. Embryo cotyledons volume growth while cotyledon cells accumulate protein and lipid substances, polysaccharide substances decreased. Endosperm development is a karyotype, which begins to cellize from the peritoneal end to the synaptic end beginning at the globular stage. After the embryo leaves differentiate, they begin to degenerate from the peritoneal end to the co-junction end. Endosperm junction at the early stages of globular embryos formed endosperm aspirates, began to show a free nuclear state, after the cell, after the embryonic stage of heart degeneration.