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

蒋天翼<sup>1; 2</sup>; 陈志钊<sup>3</sup>; 陈 曌<sup>3</sup>; 郑永利<sup>4</sup>; 陈 昕<sup>1; 2</sup>; 邓云飞<sup>5*</sup>

引用本文:	蒋天翼, 陈志钊, 陈曌, 郑永利, 陈昕, 邓云飞.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[J].广西植物,2023,43(10):1814-1827.[点击复制]
	JIANG Tianyi, CHEN Zhizhao, CHEN Zhao, ZHENG Yongli, CHEN Xin, DENG Yunfei.Leaf epidermal micromorphological features of Rhododendron subg. Tsutsusi (Ericaceae)and their taxonomic significance[J].Guihaia,2023,43(10):1814-1827.[点击复制]

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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
蒋天翼^1,2, 陈志钊³, 陈曌³, 郑永利⁴, 陈昕^1,2, 邓云飞^5*
1. 南京林业大学南方现代林业协同创新中心, 南京210037;2. 南京林业大学生物与环境学院, 南京 210037;3. 广州白云山花城药业有限公司, 广州 510555;4. 中国科学院华南植物园园艺中心, 广州 510650;5. 中国科学院华南植物园, 中国科学院植物资源保护与可持续利用重点实验室, 广州 510650

摘要:

为澄清映山红亚属(Rhododendron subg. Tsutsusi)内的系统关系问题,该研究选择杜鹃花属映山红亚属37种植物作为对象,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. farrerae-type)5种类型。(3)杜鹃型植物的气孔器周边无或具间断的条形突起。(4)岭南杜鹃型植物的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)皋月杜鹃型植物的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,推测其与叶状苞亚属具有一定的亲缘关系。(6)崖壁杜鹃型植物的叶表皮毛单一,多呈卷曲状,与其他类型有所不同且未见腺体。(7)丁香杜鹃型植物的叶表皮仅有腺体。(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。该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。

关键词: 映山红亚属, 微形态特征, 叶表皮, 分类学意义, 扫描电子显微镜

DOI：10.11931/guihaia.gxzw202203081

分类号:Q949

文章编号:1000-3142(2023)10-1814-14

基金项目:国家中医药管理局全国中药资源普查项目(GZY-KJS-2018-004); 广州白云山花城药业有限公司科研项目(Y942011)。

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

JIANG Tianyi^1,2, CHEN Zhizhao³, CHEN Zhao³, ZHENG Yongli⁴, CHEN Xin^1,2, DENG Yunfei^5*

1. Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China;2. College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China;3. Guangzhou Baiyunshan Huacheng Pharmaceutical Company Limited, Guangzhou 510555, China;4. Center of Horticulture, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;5. Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China 1. Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China; 2. College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; 3. Guangzhou Baiyunshan Huacheng Pharmaceutical Company Limited, Guangzhou 510555, China; 4. Center of Horticulture, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China; 5. Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China

Abstract:

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 features of 29 species are reported for the first time. The results are as follows:(1)The stomatal apparatus are anomocytic and all on abaxial surface.(2)According to the micromorphological features 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 features, have no or discontinuous ringed striates around stomatal apparatus.(4)The plants in R. mariae-type do not have distinct T-pieces at the polar regions of guard cells but have multilayer ringed striates.(5)It is implied that the plants in R. indicum-type have the close affinity with subg. Therorhodion in having distinct T-pieces at the polar regions of guard cells.(6)R. saxatile-type differs from other types in its simple trichomes being virgate but without glands.(7)The leaf epidermis of R. farrerae-type has glands only.(8)The relationships between the closely related species are also discussed on the basis of leaf epidermal micromorphological features. For example, R. hypoblematosum and R. polyraphidoideum tend to be treated as separate species. Support the preservation of R. naamkwanense var. cryptonerve as a variety of R. naamkwanense, and do not support the R. adenanthum into R. tenue as a synonym. The results of this study show that micromorphological features of leaf epidermis are of significant value for species delimitation in subg. Tsutsusi.

Key words: Rhododendron subg. Tsutsusi, micromorphological features, leaf epidermis, taxonomic significance, SEM