3种火龙果种子萌发及其幼苗形态的比较研究

摘要

红皮白肉、红皮红肉及黄皮白肉火龙果均具有较高的经济价值.对其种子萌发及幼苗形态的差异进行分析,将有助于3种火龙果进行高效的育种和育苗.本实验以上述3种火龙果种子为试验材料,进行火龙果种子萌发及幼苗形态间差异的研究.结果表明:在相同处理条件下,红皮白肉和红皮红肉火龙果种子的发芽率显著高于黄皮白肉火龙果,但在发芽后第14天,它们的幼苗鲜重均显著低于黄皮白肉火龙果.在幼苗移栽后第60天,黄皮白肉火龙果的幼苗鲜重和幼苗长度均显著高于红皮白肉和红皮红肉火龙果,但幼苗根系总长在3种火龙果之间差异不显著.%Hylocereus undatus,H.polyrhizus,and Selenicereus megalanthus possessed higher economic value.Identification of the differences in seed germination and the seedling morphology will contribute to the efficient breeding and planting of three cultivated pitaya.A series of seed germination and seedling morphology experiments were conducted to investigate differences in the parameters among Hylocereus undatus,H.polyrhizus,and Selenicereus megalanthus.Results indicated that H.undatus and H.polyrhizus had significantly higher seed germination percentage than S.megalanthus under the same treatment conditions,however they had significantly lower seedling fresh weight than S.megalanthus on the 14th day after pregermination.Seedling fresh weight and seedling length of S.megalanthus were significantly higher than those of H.undatus and H.polyrhizus,but no differences were presented in the root total length of the seedlings among H.undatus,H.polyrhizus,and S.megalanthus on the 60th day after seedling transplantation.