山东对囊蕨属(蹄盖蕨科)植物孢粉学研究及其在分类上的意义

采用扫描电镜对山东分布的8种对囊蕨属(Deparia)植物进行孢粉学观察。研究结果表明:在中国对对囊蕨属(Deparia Hook.& Grev.)蹄盖蕨科(Athyriaceae)新分类系统首次进行孢子形态亚显微结构研究;该属孢子形态圆肾形,左右对称,具周壁,其周壁纹饰在种内稳定,种间区别显著;为建立假蹄盖蕨亚属(Subgen.1.Athyriopsis)和蛾眉蕨亚属(Subgen.2.Lunathyrium )提供孢粉学依据;依据山东蛾眉蕨和东北蛾眉蕨孢壁纹饰的显著差异,山东蛾眉蕨应为一个独立的物种,不宜并入东北蛾眉蕨,建议恢复山东蛾眉蕨在植物分类学上的种级地位,依照对囊蕨属新分类系统,山东蛾眉蕨(Lunathyrium shandongense)新组合为中华山东对囊蕨(D.sinoshandongensis)。该研究不仅为对囊蕨属孢粉学积累了新的资料,也为近缘种的分类鉴定提供了孢粉学依据。因此对囊蕨属孢子形态研究,在该属孢粉学、分类学及系统演化上都具有重要意义。

Palynology of Deparia(Athyriaceae) from Shandong and Its Significance in Classification

The palynology of 8 species of Deparia from the Shandong was investigated using scanning electron microscopy(SEM). The submicroscopic structures of spore morphology of a new taxonomic system of the Deparia Hook.& Grev.(Athyriaceae) from the China had been studied for the first time. The spores morphology of Deparia were reniform, bilaterally symmetrical, and possessed a perispore, the perispore ornamentation was stable within species, with clear distinctions between species. This study provided a palynological basis for establishing of Subgen.1.Athyriopsis and Subgen.2.Lunathyrium. The perispore ornamentation characteristics showed that Lunathyrium shandongense J.X.Li et F.Z.Li was a distinct species,and should be restored to a species level position rather than incorporated with Lunathyrium pycnosorum(Christ) Koidz., and we have recombined L.shandongense as D.sinoshandongensis according to the new classification system of the Deparia. This study not only accumulated new data for the palynology of Deparia, but also provided palynological basis for the classification and identification of related species. Therefore, the study of the spore morphology of the Deparia was of great significance in the genus palynology, taxonomy and system evolution.