Seed micromorphology in Dactylorhiza Necker ex Nevski (Orchidaceae)and allied genera

Gamarra, Roberto Gamarra; Galán, Pablo; Pedersen, Henrik Ærenlund; Ortúñez, Emma; Sanz, Ernesto

doi:10.3906/bot-1401-66

Cited by 19 publications

(5 citation statements)

References 24 publications

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“…Hence, later correlations of these flotation times determined by Burgeff (1936) with seed mass and volume by Arditti and Ghani (2000) were not based on the same material. This may be problematic because at least some orchids show considerable intraspecific variation in seed length (Gamarra et al ., 2015). There are very few other determinations of V term for orchid seeds, e.g.…”

Section: Introductionmentioning

confidence: 99%

Measuring the terminal velocity of tiny diaspores

et al. 2016

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Although it has long been acknowledged that seed characteristics are of major importance to the conquest of tree crowns by vascular epiphytes, there is surprisingly little quantitative evidence on the aerodynamic properties of their diaspores. We used a custom-built device to determine the terminal velocity (Vterm) of falling seeds, a parameter that has been shown to have high predictive power for the wind dispersal potential of diaspores under natural conditions. We determined Vterm of 45 species of epiphytic and terrestrial Orchidaceae, which almost doubles the currently available database for this family. Although varying by a factor of five with values of 0.09–0.4 m s−1, Vterm was invariably very slow compared to plants in general. For each species, we also took morphological data and determined seed mass. None of these parameters was linearly correlated with Vterm and neither did the average Vterm differ between species found in the two habitats, although seeds of terrestrial taxa were significantly larger and heavier. Finally, we demonstrate the potential of our device to measure Vterm of even smaller diaspores by successfully quantifying Vterm of fern spores. This tool has much potential for the quantitative study of dispersal of plants with tiny diaspores, particularly in a conservation context in fragmented landscapes.

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Section: Introductionmentioning

confidence: 99%

Measuring the terminal velocity of tiny diaspores

et al. 2016

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“…Testa cells show a set of characteristics that have been observed under light and scanning electron microscopes, providing qualitative and quantitative data used to describe the seeds' morphology [2][3][4][5][6]. Previous studies on seed micromorphology have demonstrated the taxonomic value of several traits [7][8][9], and emphasize its strong correlation with molecular phylogenies [4,[10][11][12]. In Orchidaceae, seed traits are more conservative than other characteristics [4,5].…”

Section: Introductionmentioning

confidence: 99%

Seed Morphology, Life Form and Distribution in Three Bromheadia Species (Epidendroideae, Orchidaceae)

Ortúñez

Gamarra

2023

Diversity

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The seed morphology of three species belonging to the genus Bromheadia was analyzed under light and scanning electron microscopy. The seeds of B. cecieliae and B. truncata were studied for the first time. Differences in the qualitative and quantitative characteristics between the terrestrial B. finlaysoniana and the epiphytes B. cecieliae and B. truncata were observed, which were in concordance with the life form. Due to the variability of the seed shapes, a new methodology is proposed to analyze the distance between the embryo and the testa cells, with the aim of demonstrating the presence of air space within the seed. The method is compared to previous formulae used to measure free air space. Furthermore, a new measurement, the angle in twisted testa cells of epiphytic orchids, is proposed, to evaluate the degree of torsion in medial cells. Although the wide distribution of B. finlaysoniana could be related to the great buoyancy of their seeds in contrast to the limited distribution of B. cecieliae, we consider that environmental factors are more influential than the buoyancy of seeds when understanding the distribution of these taxa. Future studies on seeds morphology in orchid genera with terrestrial and epiphytic taxa will provide new insights into this research.

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“…Its representatives are marked by a high phenotypic variability, which often complicates attempts of drawing borderlines between species even within the same or close plant communities (Naczk 2018 ;Averyanov 1990). These issues have been addressed variously on the basis of morphology (van Straaten 1988;Shipunov et al 2005a), micromorphology (Hedrén 2009;Gamarra et al 2015;Akbulut 2016) morphometry (Tyteca 1999;Pedersen 2002;Shipunov 2005b;Bateman 2006;Ashish 2012;Shirokov 2020), anatomy (Aybeke et al 2010), molecular biology (Bateman et al 2003;Shipunov et al 2004;Devos et al 2006;Pillon et al 2007;Inda et al 2010;Balao 2017), and molecular genetics (Givnish 2015;Efimov 2016;Bateman 2018aBateman , 2018bKakia 2020).…”

Section: Introductionmentioning

confidence: 99%

Flower morphometry of members of the genus Dactylorhiza Necker ex Nevski (Orchidaceae) from the Altai Mountains of Kazakhstan

Sumbembayev¹,

Абугалиева

Danilova³

et al. 2021

Biodiversitas

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Abstract. Sumbembayev AA, Abugalieva SI, Danilova AN, Matveyeva EV, Szlachetko DL. 2021. Flower morphometry of members of the genus Dactylorhiza Necker ex Nevski (Orchidaceae) from the Altai mountains of Kazakhstan. Biodiversitas 22: 3545-3555. Several species of Dactylorhiza (Orchidaceae) from the Altai mountains of Kazakhstan have been investigated regarding their morphological flower variability. Significant metric characters were identified allowing to differentiate between the four species: D. incarnata, D. fuchsii, D. maculata and D. salina. The morphometric structure of flowers was analyzed by comparing 17 metric parameters in representatives of 11 populations. We identified the most variable and stable traits as well as distinctive features for each species. A high degree of flower morphometric diversity was revealed from principal component analysis for species and populations. Cluster analysis demonstrated the structure of the population diversity. Structural schemes have been compiled from data of the photographic processing of flower morphometry, the analysis of variance ANOVA, and the degree of variation at the population level. Useful characters are provided for further taxonomic work on members of the genus Dactylorhiza in Kazakhstan.

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Seed micromorphology in Dactylorhiza Necker ex Nevski (Orchidaceae)and allied genera

Cited by 19 publications

References 24 publications

Measuring the terminal velocity of tiny diaspores

Measuring the terminal velocity of tiny diaspores

Seed Morphology, Life Form and Distribution in Three Bromheadia Species (Epidendroideae, Orchidaceae)

Flower morphometry of members of the genus Dactylorhiza Necker ex Nevski (Orchidaceae) from the Altai Mountains of Kazakhstan

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