Immature zygotic embryos of Quercus variabilis were as explants to induce somatic embryogenesis. Several factors influencing somatic embryogenesis have been assayed. Somatic embryos can be induced in MS and WPM basal ...Immature zygotic embryos of Quercus variabilis were as explants to induce somatic embryogenesis. Several factors influencing somatic embryogenesis have been assayed. Somatic embryos can be induced in MS and WPM basal medium, but there was more quantity, big size and high induction rate in MS medium. Induction rate was not significant cultured in light and dark condition. Zygotic embryos, collected in middle of July, gave higher rate of somatic embryogenesis than those collected on the earlier or later date. By adding 6-BA in medium individually, somatic embryogenesis appeared directly on the zygotic embryos without detectable callus. Secondary embryogenesis appeared in medium with 2,4-D individual or combined with 6-BA or TDZ. High induction frequency of 90% was achieved in MS medium supplemented with 0.5 mg·L -1 6-BA and 2,4-D, whereas the rate in hormone-free medium was only 16.7%. The genotypes of mother trees had an great impact on the inducing rate. Zygotic embryo surgery treatments were not favorable to embryogenesis. It was best to inoculate with entire zygotic embryos. The hypocotyl was a crucial part on somatic embryogenesis for Q. variabilis.展开更多
以文心兰Oncidium flexuosum无菌苗叶片为外植体,1/2MS(Murashige and Skoog)为基本培养基,对不同叶位、叶片大小(叶龄)、不同植物生长调节物质处理诱导体胚的效果进行了研究。结果表明:①幼苗的叶尖、叶基部切口、叶面切口、叶面和叶...以文心兰Oncidium flexuosum无菌苗叶片为外植体,1/2MS(Murashige and Skoog)为基本培养基,对不同叶位、叶片大小(叶龄)、不同植物生长调节物质处理诱导体胚的效果进行了研究。结果表明:①幼苗的叶尖、叶基部切口、叶面切口、叶面和叶缘均能诱导出体胚,绝大部分体胚能形成二次体胚并能分化成多个类原球茎(PLBs)。②诱导体胚的最佳外植体材料是取自带根幼苗15mm长叶片。③诱导体胚的适宜培养基组成如下:1/2MS培养基(其中微量元素和有机添加物为全量,铁盐减半),磷酸二氢钠170.00mg·L-1,谷胺酰胺1000.00mg·L-1,蛋白胨1000.00mg·L-1,噻苯隆(TDZ)0.50mg·L-1,聚乙烯聚吡咯烷酮(PVPP)250.00mg·L-1,蔗糖20000.00mg·L-1,固化剂(gelrite)2800.00mg·L-1,pH5.2。叶片体胚诱导率为90.00%以上,叶片基部切口和中切口体胚诱导率分别达74.56%和66.91%。展开更多
文摘Immature zygotic embryos of Quercus variabilis were as explants to induce somatic embryogenesis. Several factors influencing somatic embryogenesis have been assayed. Somatic embryos can be induced in MS and WPM basal medium, but there was more quantity, big size and high induction rate in MS medium. Induction rate was not significant cultured in light and dark condition. Zygotic embryos, collected in middle of July, gave higher rate of somatic embryogenesis than those collected on the earlier or later date. By adding 6-BA in medium individually, somatic embryogenesis appeared directly on the zygotic embryos without detectable callus. Secondary embryogenesis appeared in medium with 2,4-D individual or combined with 6-BA or TDZ. High induction frequency of 90% was achieved in MS medium supplemented with 0.5 mg·L -1 6-BA and 2,4-D, whereas the rate in hormone-free medium was only 16.7%. The genotypes of mother trees had an great impact on the inducing rate. Zygotic embryo surgery treatments were not favorable to embryogenesis. It was best to inoculate with entire zygotic embryos. The hypocotyl was a crucial part on somatic embryogenesis for Q. variabilis.
文摘以文心兰Oncidium flexuosum无菌苗叶片为外植体,1/2MS(Murashige and Skoog)为基本培养基,对不同叶位、叶片大小(叶龄)、不同植物生长调节物质处理诱导体胚的效果进行了研究。结果表明:①幼苗的叶尖、叶基部切口、叶面切口、叶面和叶缘均能诱导出体胚,绝大部分体胚能形成二次体胚并能分化成多个类原球茎(PLBs)。②诱导体胚的最佳外植体材料是取自带根幼苗15mm长叶片。③诱导体胚的适宜培养基组成如下:1/2MS培养基(其中微量元素和有机添加物为全量,铁盐减半),磷酸二氢钠170.00mg·L-1,谷胺酰胺1000.00mg·L-1,蛋白胨1000.00mg·L-1,噻苯隆(TDZ)0.50mg·L-1,聚乙烯聚吡咯烷酮(PVPP)250.00mg·L-1,蔗糖20000.00mg·L-1,固化剂(gelrite)2800.00mg·L-1,pH5.2。叶片体胚诱导率为90.00%以上,叶片基部切口和中切口体胚诱导率分别达74.56%和66.91%。
