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杜鹃花属映山红亚属植物叶表皮显微形态特征及其分类学意义

Leaf epidermal features of Rhododendron subg. Tsutsusi (Ericaceae) and their taxonomic significance

摘要:为澄清映山红亚属(Rhododendron subg. Tsutsusi)内的系统关系问题,选择杜鹃花 属映山红亚属37 种植物作为研究对象,其中29 种为首次报道,通过扫描电镜,观察其叶 表皮显微特征。结果表明:(1)气孔器均为无规则型且均在远轴面。(2)根据叶片微形态 特征,可将映山红亚属的种类分为杜鹃型(R. simisii-type)、岭南杜鹃型(R. mariae-type)、 皋月杜鹃型(R. indicum-type)、崖壁杜鹃型(R. saxatile-type)及丁香杜鹃型(R. farreraetype) 等五种类型。(3)杜鹃型植物气孔器周边无或具间断的条形突起。(4)岭南杜鹃型 气孔器周围有多层条形突起环绕,保卫细胞两极不具T 型加厚。(5)皋月杜鹃型叶表皮保 卫细胞两极具有T 型加厚, 与叶状苞亚属( Subg. Therorhodion ) 叶状苞杜鹃( R. redowskianum)的气孔器特征相似,推测与叶状苞亚属具有一定的亲缘关系。(6)崖壁杜 鹃型植物表皮毛单一,多呈卷曲状与其他类型有所不同,且未见腺体。(7)丁香杜鹃型植 物表皮毛仅有腺体。(8)依据叶表皮微形态特征讨论了一些近缘种类的关系,如倾向于将 背绒杜鹃(R. hypoblematosum)和千针叶杜鹃(R. polyraphidoideum)处理为独立的种,支 持保留紫薇春(R. naamkwanense var. cryptonerve)作为南昆杜鹃(R. naamkwanense)的变 种地位,不支持将腺花杜鹃(R. adenanthum)并入细瘦杜鹃(R. tenue)作异名处理等。研 究结果表明,叶表皮显微特征在映山红亚属内物种划分上具有重要价值。

英文摘要:In order to clarify the relationships in Rhododendron subg. Tsutsusi, micromorphological characters of leaf epidermis were examined for 37 species in Rhododendron subg. Tsutsusi using scanning electron microscopy (SEM), among which the relevant characters of 29 species are reported for the first time. The results reveal that: (1) The stomas are anomocytic and all on abaxial surface; (2) According to the morphological characters of glands, trichome types and stomatal apparatus of leaf epidermis, subg. Tsutsusi can be divided into five types, i.e., R. simsii-type, R. mariae-type, R. indicum-type, R. saxatile-type and R. farrerae-type; (3) The plants in R. simsii-type have the similar morphological characters, i.e., virgate hairs, glands and stomatal apparatuses; (4) The plants in R. mariae-type without distinct T-pieces at the polar region of guard cells but have multilayer ringed striates. (5) It is implied that the plants R. indicum-type have the close affinity with subg. Therorhodion in having distinct T-pieces at the polar region of guard cells; (6) R. saxatile-type differs from other types in its simple trichomes being virgate but not glands; (7) R. farrerae-type has glands only; (8) The relationships between the closely related species are also discussed on the basis of leaf epidermal features. Micromorphological characters of leaf epidermis are of significant value for species delimitation in subg. Tsutsusi.

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[V1] 2022-08-05 16:38:28 chinaXiv:202208.00045V1 下载全文
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