甘薯品种与三倍体种间杂种2n花粉系杂交,用4种不同的植物生长调节剂配方克服其低结实性,首次获得有生活力的后代植株.观察上述杂交的花粉粒萌发,花粉管生长,卵细胞受精,胚发育及种子形成的过程,探讨了植物生长调节剂在其中的作用.结果表明,各种不同的植物生长调节剂配方都可以在一定程度上提高结实率,其中以配方100mg/L NAA++50mg/L 6-BA和30mg/L6-BA+20mg/L 2,4-D的效果最好;植物生长调节剂的主要作用在于促进受精卵细胞的分裂发育和延长子房寿命. Sweetpotato varieties were crossed with triploid interspecific hybrid 2n pollen lines, and four low-fruiting plants were crossed with four different plant growth regulator formulations to obtain the viable offspring plants for the first time.The pollen germination, pollen tube growth , Egg fertilization, embryo development and seed formation, and discussed the role of plant growth regulators in the process.The results showed that a variety of plant growth regulator formulations can improve the seed setting rate to a certain extent, of which the formula 100mg / L NAA ++ 50mg / L 6-BA and 30mg / L 6-BA + 20mg / L 2,4-D had the best effect. The main function of plant growth regulator was to promote the development of zygote and to prolong the survival of ovary.