Contribution of ovule anatomy to the taxonomic context of Parodia Spegazzini (Cactaceae)

IF 2.3 2区 生物学 Q2 PLANT SCIENCES
Patrícia Gentz, Rhaniel Nicholas Lisowski Gonçalves, Jorge Ernesto de Araújo Mariath
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引用次数: 0

Abstract

Abstract The taxonomic history of Parodia Speg. is marked by many incongruences regarding its circumscription. The main question remains regarding the union of five genera into Notocactus s.l. and, later, the union of Notocactus s.l. with Parodia s.s., leading to Parodia s.l. Given that the ovules are conserved structures and that their anatomical structure remains unexplored within the genus, we sought to identify whether the anatomical traits of these structures show potential taxonomic applicability and whether they provide information that allows the genus to be circumscribed. Samples of flower buds of 15 species and two taxa in synonymy were processed and stained using plant anatomy methods for light microscopy. The ovules of Parodia are campylotropous, bitegmic, and crassinucellate, with the micropyle delimited by the inner integument; in Parodia s.s. we observed the nucellus and embryo sac projection and changes to the micropyle type, characteristics that reflect the circumscriptions that distinguish this genus from others in the synonymy of Parodia s.l. The results may also be useful with regard to infrageneric issues, allowing the distinction of some morphologically similar taxa, adding to the discussion of their infrageneric positions. Thus, we highlight the importance of ovule anatomical traits within the taxonomic context of Parodia.
仙人掌属(仙人掌科)胚珠解剖对其分类背景的贡献
摘要/ Abstract摘要:研究了parpardia Speg.的分类学历史。它的界限有许多不一致之处。关于Notocactus s.l.的五个属的结合,以及后来Notocactus s.l.与parpardia s.s.的结合,导致parpardia s.l.的主要问题仍然存在。鉴于其胚珠是保守结构,其解剖结构在属内仍未被探索,我们试图确定这些结构的解剖特征是否具有潜在的分类适用性,以及它们是否提供了允许该属被限制的信息。采用植物解剖方法对15种植物和2个同属分类群的花蕾进行了光镜染色处理。杓果的胚珠弯曲,双球形,具粗核,珠孔被内被隔;我们观察到在parpardia s.s中,珠心和胚囊的突出以及微孔类型的变化,这些特征反映了该属与parpardia s.l同属的其他属区分的界限。这些结果也可以用于区分一些形态相似的分类群,从而增加对它们的下属位置的讨论。因此,我们强调了胚珠解剖性状在杓兰分类中的重要性。
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来源期刊
CiteScore
5.70
自引率
8.30%
发文量
54
审稿时长
3.5 months
期刊介绍: The Botanical Journal of the Linnean Society publishes original papers on systematic and evolutionary botany and comparative studies of both living and fossil plants. Review papers are also welcomed which integrate fields such as cytology, morphogenesis, palynology and phytochemistry into a taxonomic framework. The Journal will only publish new taxa in exceptional circumstances or as part of larger monographic or phylogenetic revisions.
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