桢楠多胚现象与多胚苗形态发育的研究

Research on Polyembryony of Phoebe zhennan and Morphogenesis of its Polyembryonic Seedlings

摘要: 通过对桢楠种子的解剖,观察分析了桢楠种子多胚的形态和着生位置;对其进行播种获得幼小植株,观察其幼苗的生长发育状况,取根尖进行了体细胞染色体数目鉴定。结果表明,桢楠种子多胚率为12.4%,多胚形态和着生位置各异。多胚再生植株的生长发育特点也不相同。多胚苗体细胞染色体数目是2n=24,未发现染色体的数目变异。

Abstract: The polyembryony of Phoebe zhennan seeds was found through their anatomy. Observation was conolucted on the shape and position of the polyembryony seeds of Phoebe zhennan. Besides,analysis was made of the morphology and growth characters of generated seedlings. The results showed that its polyembryony rate was 12.4%. The shape and position of the embryos in seeds and growth characters of the seedlings with polyembryony in all the materials tested were very different. Somatic chromosome number of polyembryonic seedlings was 2n=24,and no change in chromosome number was observed.