Asymmetry in<i>Luticola</i>species

Kulichová, Jana; Neustupa, Jiří; Vrbová, Kateřina; Levkov, Zlatko; Kopalová, Kateřina

doi:10.1080/0269249x.2019.1604435

Cited by 4 publications

(7 citation statements)

References 43 publications

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“…The changes in cymbelloid shape observed in Frustulia (Figure 4) are not consistent with the directional asymmetry of Luticola species, where the most pronounced changes were observed in the middle part of the valve outline [18,55]. A possible explanation for the increased cymbelloid asymmetry in the middle part of Luticola valves is in the form of an initial cell (the first frustule of maximum size developed from the auxospore) that, in some/all Luticola species, has a markedly swollen outline in the middle part [55,57].…”

Section: Common Asymmetric Shape Variation Across Lineagesmentioning

confidence: 64%

“…We followed a process of landmark-based morphometrics published elsewhere [16,18,32]. Briefly, CW and CCW files of individual strains were used to test for measurement errors due to imaging and digitizing.…”

Section: Geometric Morphometric Analysesmentioning

confidence: 99%

“…Diatoms that are classified as bilaterally symmetric may also exhibit more or less visible cymbelloid symmetry. For instance, the genus Luticola exhibits cryptic [18,55] as well as apparent dorsiventrality (e.g., [61]), but also balanced levels of asymmetric shape components [16]. Cymbellales share with at least one Luticola species [57] the cis symmetry (i.e., the primary sides of both valves are on the same side [59]), whereas representatives of the genera Frustulia and Amphipleura (F. saxonica, F. vulgaris, A. pellucida; [59,62]) have both cis and trans symmetry (i.e., primary sides of the valves are on the same or on opposite sides of the frustule).…”

Section: Common Asymmetric Shape Variation Across Lineagesmentioning

confidence: 99%

“…Although shape changes during ontogeny may obscure interspecific differences, species-specific allometric trajectories may be recognized and quantified using morphometric methods [13][14][15]. Cell division can produce deviations in symmetric structures such as valve outlines that may reflect genetic, environmental, or random variability in developmental processes [16][17][18]. In diatoms, pronounced intraspecific phenotypic plasticity may arise by the transmission and subsequent amplification of tiny deviations in the course of the vegetative part of the life cycle [19].…”

Section: Introductionmentioning

confidence: 99%

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Symmetric and Asymmetric Components of Shape Variation in the Diatom Genus Frustulia (Bacillariophyta)

Kulichová

Urbánková

2020

Symmetry

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Irregularities in cell division can produce asymmetry in symmetric structures, such as outlines of diatom cells, which can reflect genetic, environmental, or random variability in developmental processes. This study examined 12 phylogenetic lineages of the diatom genus Frustulia using landmark-based geometric morphometrics to assess the variation between cell segments separated by apical and transapical axes. Although asymmetric variation within cells differed in some lineages, these irregularities most likely did not reflect the evolutionary history of the lineages. The intraclonal phenotypic plasticity of diatom frustules was induced rather by nongenetic factors, i.e., inherited valve abnormalities, constraints of siliceous cell walls, and random developmental instability during morphogenesis. The positive correlations between the symmetric and asymmetric components of shape variation indicated that the morphogenesis of diatom cell walls affected irregularities within cells and variability among the symmetrized cells to a similar extent.

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Section: Common Asymmetric Shape Variation Across Lineagesmentioning

confidence: 64%

Section: Geometric Morphometric Analysesmentioning

confidence: 99%

Section: Common Asymmetric Shape Variation Across Lineagesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Symmetric and Asymmetric Components of Shape Variation in the Diatom Genus Frustulia (Bacillariophyta)

Kulichová

Urbánková

2020

Symmetry

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“…The valves characterised by subtle asymmetrical differences in the valve outline have recently been the subject of geometric morphometric studies using decomposition of total asymmetry in valve outline into components of directional asymmetry (DA) and fluctuating asymmetry (FA). Natural populations (Kulichová et al 2019) and genetically uniform clonal populations (Woodard & Neustupa 2016) examined in this way have shown that FA within a species was mostly not correlated with the valve size, and that a less complex shape in small cells does not mean less variability. Consideration was also given to the possibility that the entire valve outline of Luticola species could be systematically asymmetric in relation to the pattern of its central area, if the DA of the central area is distinct (Woodard & Neustupa 2016).…”

Section: Cell Symmetrymentioning

confidence: 98%

Luticola rojkoviensis sp. nov. (Bacillariophyta), a new terrestrial diatom from Central Slovakia

Hindáková¹,

Noga²

2021

Fottea

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Sampling of fungi in a grassland on a hill in Rojkov, Central Slovakia, revealed a new species of Luticola (Diadesmidaceae). Its terrestrial populations were found close to the basis of the fertile part of the geoglossoid fungi (Geoglossaceae) that were overgrown with filamentous cyanobacteria of the orders Oscillatoriales and Synechococcales. Luticola rojkoviensis sp. nov. is characterized by the valve outline and the structure of the external valve face: valves are weakly dorsiventrally asymmetrical, rhombic-lanceolate in larger cells to rhombic-elliptic and tri-undulate in smaller cells, with shortly protracted and broadly rounded valve apices. Valve face is minimally concave, as the axial area is lowered and the area around distal raphe elevated. The surface of the valve is mostly uneven due to many depressions, so the external shape of the areolae and the impression of irregular longitudinal rows depend on the extent of these valve ornamentations. Proximal raphe endings are unilaterally slightly deflected, expanded into small central pores. The shape of both the proximal and the distal raphe fissures is slightly asymmetrical. The morphological characteristics of Luticola rojkoviensis sp. nov. are remarkably similar to those of L. hustedtii Levkov, Metzeltin et A.Pavlov, L. ectorii Levkov, Metzeltin et A.Pavlov and L. acidoclinata Lange-Bertalot. The association of Luticola rojkoviensis sp. nov. with geoglossoid fungi and epiphytic cyanobacteria is discussed.

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Geometric Morphometrics of Bilateral Asymmetry in Eunotia bilunaris (Eunotiales, Bacillariophyceae) as a Tool for the Quantitative Assessment of Teratogenic Deviations in Frustule Shapes

Woodard

Neustupa

2021

Symmetry

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A number of pennate diatom genera typically have teratogenic deformations of their siliceous frustules due to the effects of environmental stress, such as high concentrations of heavy metals and low pH. However, the quantitative assessment of these deformations has rarely been applied. One species in which aberrations have frequently been reported is Eunotia bilunaris, which typically has bilaterally symmetric frustules with dorso-ventral differentiation. In this study, we aimed to illustrate the geometric morphometric analysis of symmetry as a tool for assessing the severity of teratogenic deformations. These were quantified by Procrustes superimposition of equidistant points placed along the valvar outlines in pairs of configurations based on their bilateral reflection symmetry. The shape deformations were mostly confined to central parts of the ventral outlines and were captured both by the symmetric and asymmetric subspaces of the variation. The amount of bilateral asymmetry in individual cells was negatively related to frustule size via the allometric power law relationship, illustrating that asymmetry increased in the asexual diminution series. The presented analysis provides a framework for the quantitative assessment of frustule deformations in eunotioid diatoms that can be used for the comparative scoring of teratogenic deviations among cells, populations, or species.

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Asymmetry inLuticolaspecies

Cited by 4 publications

References 43 publications

Symmetric and Asymmetric Components of Shape Variation in the Diatom Genus Frustulia (Bacillariophyta)

Symmetric and Asymmetric Components of Shape Variation in the Diatom Genus Frustulia (Bacillariophyta)

Luticola rojkoviensis sp. nov. (Bacillariophyta), a new terrestrial diatom from Central Slovakia

Geometric Morphometrics of Bilateral Asymmetry in Eunotia bilunaris (Eunotiales, Bacillariophyceae) as a Tool for the Quantitative Assessment of Teratogenic Deviations in Frustule Shapes

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