摘要
黑穗醋栗(Ribes nigrum L.)授粉后4～5天完成受精作用。原胚初期常有发育不规整原胚,但后期趋于正常。原胚期分化较慢,持续时间较长。成熟胚较小,直立型,位于种子基部;胚乳发育属细胞型。次生极核于合点端受精后,逐渐分裂形成细胞。前期胚乳细胞自合点端向珠孔端纵向延伸,并于胚囊中央形成网络状,后期在原来细胞的基础上大量增殖,形成区域化现象。成熟种子的胚乳极为发达。
The development of the embryo was relatively slow and the original embayo had an irregular shape at the beginning.The mature embryo was small and vertical at the base of the seed. The development of endosperm was of cellular type. After the newborn endosperm nuclei divided, the cells were formed step by step from the chalaza side to the micropyle side. During endosperm development, cellular zones occurred in the late stage.
关键词
黑穗醋栗
胚
胚乳
发育
black currant (Ribes nigrum L. )
embryo, enbosperm
development
