核果茶属的气孔器类型及其系统学意义

Stomatal apparatus of Pyrenaria (Theaceae) and its systematic significance

为了检验有关核果茶属气孔器类型不同的研究结果 ,使用从模式标本上获取的实验材料重新观察了耿煊 (H .Keng)在 1 962年报道过的具有毛茛型气孔器的核果茶属 3个种的叶片下表皮 ,得到了与耿煊不同的研究结果 ,即核果茶属的气孔器属大头茶型 ,与邻近的石笔木属、拟核果茶属乃至山茶亚科的气孔器类型一致。结果提示 。

In order to verify the contradictory reports about the type of stomatal apparatus in Pyrenaria ,three species,which were sampled by Keng in 1962,were investigated again,using the leaf abaxial epidermises from the type specimens concerned. Inconsistent with Keng’s result about the stomatal apparatus of Ranunculaceous Type,the present research reveals that all samples examined here are of the stomatal apparatus of Gordoniaceous Type,which further confirms the previous observations performed by Kvacek et Walther in 1984 and Yang et Min in 1995 based on other Pyrenaria species. It may be concluded that the stomatal apparatus of Gordoniaceous Type is shared by Pyrenaria and its allied taxa such as Tutcheria and Parapyrenaria as well as all members in the subfamily Camellioideae,and regarded as a diagnostic feature to divide Camellioideae from Ternstroemioideae in which all members exhibit the coincident stomatal apparatus of Ranunculaceous Type as was reported by Keng in 1962. The present study clear away the obstacles for the establishment of Pyrenaria in a broad sense,which has been and will be supported by the evidences from different disciplines provided by the present authors and other scholars.