郁南无核黄皮胚囊异常发育的细胞学观察

The Cytological Observation of Embryo Sac Development Abnormality in Yu'nan Seedless Wampee

利用石蜡切片观察了郁南元核黄皮和有核鸡心黄皮胚囊发育状况．结果表明：郁南无核黄皮胚囊发育存在败育现象，即表现为开花当日有91．9％的胚囊未发育达到受精的成熟状态，花后1～7d，仍有81．6％的胚囊未发育达到八核期成熟胚囊；而对照材料有核鸡心黄皮在开花当日和花后7d内发育到八核期成熟胚囊的比率分别为96．7％和100％．郁南无核黄皮胚囊受精前败育是导致其无核的重要原因之一，也是其和有核黄皮混种能稳定保持无核性状的重要原因．

The embryo sacs of Yu＇ nan Seedless Wampee and Jixin Wampee were observed via microscopic examination with paraffin sections. The abortion could be found in all developmental stages of the embryo sacs in Yu＇ nan Seedless Wampee. 91.9% embryo sacs of Yu＇ nan Seedless Wampee were immature on the flowering day and 81.6% of them were still immature after flowering one to seven days. Conversely, the normal Jixin Wampee showed 96.7% and 100% mature embryo sacs, respectively. The abortion of the embryo sac before fertilization not only caused the seedless phenomenon of Yu＇ nan Seedless Wampee, but also keep the seedless results when both seedy species of Wampee plants grown together.