沙棘属植物种子微形态特征研究

应用解剖镜和扫描电镜对沙棘属(Hippophae Linn.)6种6亚种植物种子形态、种皮微形态特征进行了观察.结果表明:沙棘属植物种子形态、种皮微形态等性状具有一定程度的稳定性,同时种间存在明显的差异,对于种及种下类群的分类、鉴定有重要参考价值.其中种皮微形态可分为4种类型:拟脑纹状纹饰、线纹-穴状纹饰、近平滑-细疣状纹饰、浅穴-疣状纹饰.从内果皮和种皮结合程度及种皮表面光泽一致性等方面可明显地将沙棘属植物划分为二者紧密结合与分离两种情况,基本支持将沙棘属植物划分为有皮组和无皮组两大类群的观点,但观察结果存在一些差异.

Micromorphological Features of the Seed Surface of the Genus Hippophae L.

Seed morphology and micromorphology of the seed coat of six species and six subspecies of Hippophae L. from China were examined by stereoscope and scanning electron microscope（SEM）.The results showed that these species were obviously different in seed shape and seed coat micromorphology.These micromorphological features were important in their classification.The seed surface morphologies were divided into four types： paracerebroid,lineate-foveate,nearly smooth-fine verrucose,and shallow foveate-verrucose.Degree of separation of endocarp and seed coat indicated that they were also divided into two types： close combination and separation.The results of the study partly support Lian ＇ s viewpoint that Hippophae is divided into two sections： Sect.1.Hippophae and Sect.2.Gyantsenses,but also showed there were some differences.