{"title":"Pollen diversity of Xenostegia D.F.Austin et Staples (Convolvulaceae)","authors":"Ine De Man, Ana Rita Giraldes Simões","doi":"10.1080/00173134.2021.1990398","DOIUrl":null,"url":null,"abstract":"Abstract Xenostegia D.F.Austin et Staples is a small genus in the family Convolvulaceae, with five species restricted to Africa, and one species widespread across the Paleotropics. It was initially established to accommodate two species in Merremia that possessed non-spinulose pantoporate pollen, rare in the family, along with stigma and anther characters that did not fit other genera entirely. Recent molecular studies, and the discovery of a new species in Central Africa, have expanded the delimitation of this genus from two to six species. Our survey captures the palynological variation of all currently documented species of Xenostegia, revealing that more types of pollen aperture patterns are present (15- and 30-colpate), with implications for the circumscription of the genus. In addition, a unique pattern of exine sculpture (plurigemmate-echinate) was discovered, which is shared by all the species and has not yet been documented in any other member of family Convolvulaceae.","PeriodicalId":50414,"journal":{"name":"Grana","volume":"61 1","pages":"132 - 139"},"PeriodicalIF":0.9000,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Grana","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1080/00173134.2021.1990398","RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PLANT SCIENCES","Score":null,"Total":0}
引用次数: 1
Abstract
Abstract Xenostegia D.F.Austin et Staples is a small genus in the family Convolvulaceae, with five species restricted to Africa, and one species widespread across the Paleotropics. It was initially established to accommodate two species in Merremia that possessed non-spinulose pantoporate pollen, rare in the family, along with stigma and anther characters that did not fit other genera entirely. Recent molecular studies, and the discovery of a new species in Central Africa, have expanded the delimitation of this genus from two to six species. Our survey captures the palynological variation of all currently documented species of Xenostegia, revealing that more types of pollen aperture patterns are present (15- and 30-colpate), with implications for the circumscription of the genus. In addition, a unique pattern of exine sculpture (plurigemmate-echinate) was discovered, which is shared by all the species and has not yet been documented in any other member of family Convolvulaceae.
摘要Xeostegia D.F.Austin et Staples是旋花科中的一个小属，有五种仅限于非洲，一种分布在古热带地区。它最初是为适应梅里亚的两个物种而建立的，这两个物种具有非刺状全孔花粉，在该科中很罕见，同时具有不完全适合其他属的柱头和花药特征。最近的分子研究，以及在中非发现的一个新物种，将该属的划界范围从两个扩大到六个。我们的调查捕捉到了目前所有记录在案的Xenosticia物种的孢粉学变化，揭示了更多类型的花粉孔模式（15-和30-colpate），这对该属的范围有影响。此外，还发现了一种独特的出口雕刻图案（多棱针叶树），所有物种都有这种图案，尚未在旋花科的任何其他成员中记录在案。
期刊介绍：
Grana is an international journal of palynology and aerobiology. It is published under the auspices of the Scandinavian Palynological Collegium (CPS) in affiliation with the International Association for Aerobiology (IAA). Grana publishes original papers, mainly on ontogony (morphology, and ultrastructure of pollen grains and spores of Eucaryota and their importance for plant taxonomy, ecology, phytogeography, paleobotany, etc.) and aerobiology. All submitted manuscripts are subject to initial appraisal by the Editors, and, if found suitable for further consideration, to peer review by independent, anonymous expert referees. All peer review is single blind and submission is online via ScholarOne Manuscripts.
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