Seed micromorphology and its taxonomic significance to Xyris (Xyridaceae, Poales)

Nardi, Kaire de Oliveira; Oriani, Aline; Scatena, Vera Lúcia

doi:10.1007/s40415-015-0244-9

Cited by 4 publications

(1 citation statement)

References 16 publications

(27 reference statements)

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“…The length/width ratio ranged from 1.33-2.00 (1.69 ± 0.17) mm in H. uralum to 3.97-6.41 (5.03 ± 0.48) mm in H. pseudohenryi Seed morphological traits provide important information for the classification and evolution of seed plants and can play a major role in species delimitation (Corner, 1976;Dahlgren, 1980). These traits are often the subject of morphological studies to resolve various taxonomic complexities (Gabr, 2014;Ghimire et al, 2015;Han et al, 2021;Kanwal et al, 2022;Kramina & Polevova, 2022;Luqman et al, 2019;Nardi et al, 2016;Veiskarami et al, 2018). In Hypericum, seed morphology has been considered an important character for solving taxonomic problems at the section and species levels (Alonso et al, 2013;Corner, 1976;Meseguer & Sanmartín, 2012;Núñez, 1982;Robson, 1981;Szkudlarz & Celka, 2016).…”

Section: Seed Sizementioning

confidence: 99%

Seed morphology of Hypericum (Hypericaceae) in China and its taxonomic significance

Bai

Zhao

Drew

et al. 2023

Microscopy Res & Technique

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The seed morphology of 40 taxa within the genus Hypericum (Hypericaceae) from China, representing 9 sections of the genus, was examined using both Light and Scanning Electron Microscopy to evaluate the taxonomic relevance of macro‐ and micro‐morphological features. Details articulating variation in seed size, color, shape, appendages, and seed coat ornamentation are described, illustrated, and compared, and their taxonomic importance is discussed. Seeds were generally brown in color and cylindric‐ellipsoid to prolonged cylindric in shape. Seed size displayed wide variation, ranging from 0.37–1.91 mm in length and 0.12–0.75 mm in width. Seed appendages were observed as a characteristic morphological feature. Seed surface ornamentation has high phenotypic plasticity, and four types (reticulate, foveolate, papillose, and ribbed) can be recognized. In general, seed color and shape have limited taxonomic significance. However, some other features represent informative characters that can be used efficiently in distinguishing the studied taxa at the section and/or species levels. The findings illustrate that considerable taxonomic knowledge can be obtained by investigating the seed features of Hypericum, and the use of Scanning Electron Microscopy can reveal inconspicuous morphological affinities among species and play a role in taxonomic and systematic studies of the genus Hypericum.Research Highlights Macro‐ and micro‐morphological features of seeds of 40 Hypericum taxa from China were examined using Light and Scanning Electron Microscopy, providing the first broad study regarding seed morphology for Hypericum from China. Details and variations of seed size, shape, color, surface ornamentation, and appendages are fully presented. Seed features and their variation have important taxonomic significance at the section and/or species levels within Hypericum.

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Section: Seed Sizementioning

confidence: 99%

Seed morphology of Hypericum (Hypericaceae) in China and its taxonomic significance

Bai

Zhao

Drew

et al. 2023

Microscopy Res & Technique

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Diversity of seed-coat structure and thickness among six genera representing tribes Sophoreae, Crotalarieae, and Genisteae (Papilionoideae, Fabaceae) in Egypt

et al. 2022

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‘Dust seeds’ with undifferentiated embryos and their germination in mycoheterotrophic Monotropoideae (Ericaceae)

Baskin

2020

Seed Sci. Res.

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‘Dust seeds’ with an undifferentiated (organless) embryo are known to be produced by mycoheterotrophic species (MH) in nine families of angiosperms. However, aside from the numerous studies on seed germination of orchids, relatively little is known about germination in MH families. In the Ericaceae, some degree of mycoheterotrophy (full, partial or initial) and dust seeds with an undifferentiated embryo occur in all species in the three tribes of Monotropoideae, the only subfamily of Ericaceae with this combination of characters. In most species, the seed is <0.90 mm in the greatest dimension, the endosperm is absent (Pityopus) or consists of few to many (30–40) cells, and the embryo is minute, consisting of as few as two cells in Monotropa. Germination in Monotropoideae is monopolar, with only the radicular pole of the embryo participating in germination. Thus, germination polarity differs from that of the dust seeds of orchids in which only the plumular pole of the embryo (protocorm) participates in germination. The dust seeds in Monotropoideae require the presence of fungi, either direct contact with a fungus or the presence of a diffusible substance therefrom, to germinate (symbiotic germination). Recently, representatives of the four genera of tribe Pyroleae have been successfully germinated asymbiotically in vitro. We present a broad overview of dust-size seeds in angiosperms and conclude that they should be subdivided into at least two major categories.

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Seed micromorphology and its taxonomic significance to Xyris (Xyridaceae, Poales)

Cited by 4 publications

References 16 publications

Seed morphology of Hypericum (Hypericaceae) in China and its taxonomic significance

Seed morphology of Hypericum (Hypericaceae) in China and its taxonomic significance

Diversity of seed-coat structure and thickness among six genera representing tribes Sophoreae, Crotalarieae, and Genisteae (Papilionoideae, Fabaceae) in Egypt

‘Dust seeds’ with undifferentiated embryos and their germination in mycoheterotrophic Monotropoideae (Ericaceae)

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