Embryo Development and Abnormal Phenomena in Two Accessions of Mulberry

The early embryo development of mulberry varieties Longsang and Chuisang were observed by routine paraffin sections.The results showed that the development of the embryoe were almost unanimous between Longsang and Chuisang.At first the megaepore in bud began to develop without fecundation.Then developed into the cells just like zygote and then formed a stick-shaped embryo,ball-shaped embryo,heart-shaped embryo,and torpedo-shaped embryo finally.At last the embryo became mature.Some abnormal phenomena were observed during the development of the embryo,such as the disappearance of nucellar and integument,the abnomal division of megaepore.