摘 要 :用对甘薯组 A 群的种 I.tiliacea 和 I.gracilis 与 B 群的种 I.trifida 和 I.littoralis 杂交观察授粉后的胚胎发生的情况,发现授粉后7小时,花粉粒均能在柱头上发芽,花粉管也能通过花柱到达胚珠。在授粉后两天的子房内,可看到已受精、正受精、未受精等受精过程的各个阶段。此时以 B 群 K_(233-1)为母本的卵细胞受精率可达80%
Abstract:In general successful crossing between different groups of section Batatas is impossibleunder natural conditions.It is necessary to ascertain the cause of sterility by anatomical ob-servations.Four species were used:I.trifida(4x)(K 300-5)and I.littoralis(4x)(K 233-1)of group B,I.tiliacea(4x)(K 270-5