First data on in situ pollen of Permotheca sardykensis Zalessky 1929 from the middle Permian of the Russian Platform
First data on in situ pollen of Permotheca sardykensis Zalessky 1929 from the middle Permian of the Russian Platform
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来自俄罗斯地台中二叠纪的 Permotheca sardykensis Zalessky 1929 的原位花粉数据
DOI：
10.1007/s12542-021-00558-7
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发表时间：
2022
期刊：
影响因子：
1.8
通讯作者：
T. Foraponova
中科院分区：
文献类型：
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作者：
T. Foraponova
首次从沙迪克管壁菌Permotheca sardykensis的孢子囊中提取花粉粒。该物质来源于Kostovaty地区（俄罗斯乌德穆尔特共和国）的中二叠世沉积物。用光学显微镜、扫描电镜和透射电镜对花粉粒进行了研究。花粉粒圆形至椭圆形，原双囊，有一个薄壁。囊非常小，在透射光下很难看到，但在扫描电子显微镜下，它们的雕塑与身体区域不同（它们可以通过它们的psilate表面与疣状身体雕塑来区分）。在透射电子显微镜下，仅通过花粉壁的相当薄来区分窃生物。花粉壁由两层组成，这可以解释为厚的外壁和薄的内壁，外壁没有明确的亚层划分。在花粉粒外，可能存在薄的绒毡层的残余。观察到的结果可能是由于成岩过程中花粉壁的退化或花粉壁发育不完全造成的。花粉囊的花粉粒形态为P. sardykensis强烈不同于原位花粉类型，这些花粉类型在早期从其他Permothecasspecies中描述或与Peltaspermale相关。这可能表明Permotheca属的异质性。
Pollen grains were extracted from sporangia of the pollen organPermotheca sardykensisfor the first time. The material originates from the middle Permian deposits of the Kostovaty locality (Udmurt Republic, Russia). The pollen grains were studied with light, scanning, and transmission electron microscopy. The pollen grains are rounded to oval, protobisaccate, with a leptoma. The sacci are very small and difficult to see under transmitted light, but, in a scanning electron microscope, differ from the corpus region in their sculpture (they can be distinguished by their psilate surface versus verrucate corpus sculpture). The leptoma was distinguished in the transmission electron microscope only by a considerable thinning of the pollen wall. The pollen wall consists of two layers which may be interpreted as a thick ectexine without a clear subdivision into sublayers and a thin endexine. Outside the pollen grains, remnants of a thin probable tapetal layer are present. The observed results could arise from pollen wall deterioration during diagenesis or incomplete pollen wall development. The pollen grains from the sporangia ofP. sardykensisstrongly differ from in situ pollen types which were described from otherPermothecaspecies earlier or were associated with Peltaspermales. This may indicate a heterogeneity of the genusPermotheca.