甘薯良种繁育不快,这一方面因为甘薯是无性繁殖作物,块根体积大,单株結薯数不多,单位面积內株数少,加以种薯經过严格选择,因而繁殖系数不高。此外在加速繁育的措施上,过去也缺乏系統的研究,使良种普及受到限制。 目前我国对甘薯所采用的育种方法,以品种間有性杂交和系統选择为主。在选育初期,所选中的材料不过是一粒杂交种子的后 Sweet potato breeding is unpleasant, on the one hand, because sweet potato is asexual reproduction crops, tuberous volume is large, the number of tubers per plant is small, the number of plants per unit area is small, and the seed selection is made strictly, so the breeding coefficient is not high. In addition, measures to speed up breeding have not been systematically studied in the past, limiting the popularity of improved varieties. At present, the breeding methods adopted by sweet potatoes in China are mainly sexual hybridization and systematic selection. In the early breeding, the selected material is no more than a hybrid seed