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在人工授粉条件下,观察了小叶杨有性生殖过程的形态发育及其持续时间,结果如下:除正常花粉外,有异常和败育花粉,但不影响传粉和受精。胚珠倒生,单珠被,厚珠心,蓼型胚囊,珠孔受精,核型胚乳,胚的发育属柳叶菜型,种缨由胎座表皮细胞发育而成,柱头属湿型,花柱是实心的。人工授粉后4小时,花粉粒90％以上萌发,授粉后48小时,花粉管到达胚囊,双受精作用发生在授粉后3—6天,胚乳游离核时期持续约15—18天,但从胚乳游离核到胚乳细胞全部形成只需2—3天,合子“休眠”6—10天,原胚期约10天,心形期和鱼雷期各约2天,幼胚后期发育迅速,胚体由占种子内全长的1/3至充满整个种子只需5—6天。从授粉到种子成熟,历时约一个月。
Under the conditions of artificial pollination, Morphological development and duration of sexual reproduction of Populus simonii were observed. The results are as follows: In addition to normal pollen, abnormal and aborted pollen, but did not affect pollination and fertilization. Oviparous abdomen, single bead, thick bead heart, Polygonum type embryo sac, peritoneal cavity fertilization, nuclear endosperm, the development of the embryo is willow-type, the tassel from the placenta of the placenta developed Stigma is wet, Style is solid. Four hours after artificial pollination, more than 90% of pollen grains germinate, pollen tubes reach the embryo sac 48 hours after pollination, double fertilization occurs 3-6 days after pollination, and the endosperm free nucleus lasts about 15-18 days. However, Free nucleus to complete formation of endosperm cells only 2-3 days, zygote “dormant” 6-10 days, the embryo of about 10 days, the heart phase and the torpedo period of about 2 days, late embryo development rapidly, embryo body by The total length of the seed 1/3 to fill the entire seed only 5-6 days. From pollination to seed maturity, which lasted about a month.