How does micromorphology reflect taxonomy within the Xeranthemum group (Cardueae-Asteraceae)?

Gavrilović, Milan; Garcia‐Jacas, Núria; Susanna, Alfonso; Marin, Petar D.; Janaćković, Pedja

doi:10.1016/j.flora.2019.02.007

Cited by 7 publications

(27 citation statements)

References 27 publications

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“…Our results (Table 1) show that the middle involucral bract of A. elegans is similar to those of Amphoricarpos exsul and Shangwua masarica (Lipsky) Yu J. Wang & Raab-Straube (Gavrilović et al 2019) regarding the presence and distribution of vermiform trichomes, which are on the margins and near the tip. However, the mucro of the involucral bract is oblong-obtusate in A. elegans, while in A. exsul it is very short (Gavrilović et al 2019). In addition, our results show that the middle involucral bract of A. elegans is slightly arachnoid-hairy and crimped-ciliate along the margin to almost glabrous and mucronate, which agrees with the observation of Linczevsky (1962).…”

Section: Discussionsupporting

confidence: 66%

“…In addition, our results show that the middle involucral bract of A. elegans is slightly arachnoid-hairy and crimped-ciliate along the margin to almost glabrous and mucronate, which agrees with the observation of Linczevsky (1962). It was previously shown that annual genera of the subtribe Xerantheminae produce weddellite crystals on the surface of involucral bracts (Gavrilović et al 2017(Gavrilović et al , 2019.These crystals were not observed on the surface of the involucral bract of A. elegans, which confirms that only annual genera of the subtribe Xerantheminae produce these crystals.…”

Section: Discussionsupporting

confidence: 52%

“…In contrast to the findings of Petit (1997), trichomes consisting of four to five cells were not observed in our study. Cypselae of A. exsul are sericeous (albeit the outer cypselae less so) with much longer trichomes (Gavrilović et al 2019) compared to A. elegans (Table 1). Twin trichomes usually occur on the cypselae surface in Asteraceae members (Robinson 2009).…”

Section: Discussionmentioning

confidence: 99%

“…Micromorphological characters, especially those of the cypsela, have been widely used in detecting taxonomic and phylogenetic relationships within the family Asteraceae (Abid & Qaiser 2009;Gavrilović et al 2019;Ozcan & Acinci 2019). Petit (1997) performed a cladistic analysis on 45 Cardueae genera, including Amphoricarpos, and presented 75 characters, including characters of involucral bracts and cypselae.…”

Section: Introductionmentioning

confidence: 99%

“…It was shown that cypsela features are very informative at the generic level within the Xerantheminae (Gavrilović et al 2019). In a previous investigation, we examined leaf micromorphology of A. elegans and its relationship with production of sesquiterpenes lactones and antioxidative activity (Gavrilović et al 2018a).…”

Section: Introductionmentioning

confidence: 99%

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Micromorphology of an involucral bract and cypselae of the endemic and relict species Amphoricarpos elegans Albov (Asteraceae, Cardueae) from the Caucasus

et al. 2020

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In this study, micromorphology of an involucral bract and inner and outer dimorphic cypselae of the relict Amphoricarpos elegans, endemic from western Caucasus, is examined using a scanning electron microscope (SEM) and presented here for the first time. The middle involucral bract is nearly glabrous, with a reticulate-rugulose surface and an oblong-obtusate mucro. Both cypselae exhibit similar features, viz., narrowly oblong-cylindrical or obovate shape with more or less conspicuous longitudinal ribs, an adaxial detachment area, an asymmetrical carpopodium, absence of a pericarp crown and a barbate-aristate pappus made up of narrow, subulate, basally smooth and apically barbate bristles. However, some differences are evident. The outer cypsela is glabrescent and flattened, with an obscure outline of epidermal cells lacking an end wall and with a sunken periclinal surface and striatereticulate structure. Also, the outer cypsela has two entire, narrow, lateral wings, rounded above; and less numerous pappus bristles in one row. In contrast to this, the inner cypsela has a distinct outline of the epidermal cells, which are rod-shaped with a short acute end wall, a swollen periclinal surface and reticulate structure. The pappus of the inner cypsela possesses many more bristles organised in two rows (a biseriate pappus). Also, slightly pentagonal or round nectary remnants are found in the centre of the upper part of the inner cypsela. The taxonomic value of the analysed characters is briefly discussed.

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Section: Discussionsupporting

confidence: 66%

Section: Discussionsupporting

confidence: 52%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micromorphology of an involucral bract and cypselae of the endemic and relict species Amphoricarpos elegans Albov (Asteraceae, Cardueae) from the Caucasus

et al. 2020

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Micromorphological and cytological comparisons between Youngia japonica and Youngia longiflora using light and scanning electron microscopy

Choi

Kim

Jang

2020

Microscopy Res & Technique

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The genus Youngia Cass. is taxonomically complex and widely distributed in East Asia. Despite the high diversity of species, only two species, Youngia japonica (L.) DC. and Youngia longiflora (Babc. & Stebbins) C.Shih, are currently found in Korea. Among them, Y. longiflora was once recognized as a subspecies of Y. japonica. However, based on chloroplast and nuclear DNA sequences, as well as morphology, Y. longiflora was found to be a distinct species. Here, the two Korean Youngia species were analyzed using scanning electron microscope and light microscope for chromosome number, pollen, cypselae, and leaf micromorphological characters to evaluate if the examined characters are informative for taxonomy. Pollen morphology is described, and the micromorphological characters of Y. longiflora are described for the first time. Cypselae and pollen surface ornamentation, as well as trichome morphology and stomatal size varied between the two species. Y. japonica had longer chromosomes than Y. longiflora, while other chromosomal characters including the localization of the NOR (nucleolar organizer region) were similar. The present micromorphological and cytological results are of great taxonomic value for Youngia species identification in Korea.

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Palynomorphological diversity among the Asteraceous honeybee flora: An aid to the correct taxonomic identification using multiple microscopic techniques

Nabila

Ahmad

Zafar

et al. 2021

Microscopy Res & Technique

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This study aimed to characterize the palynological morphology of melliferous species of family Asteraceae belonged to seven tribes which were categorized into 15 genera and were studied under light and scanning electron microscopy. The pollen grains were acetolyzed, measured, and described qualitatively. Quantitative data were analyzed by descriptive and multivariate statistical analysis. The species were analyzed considering 11 quantitative pollen characteristics. The study revealed that the pollen grains are circular, triangular, angular, semi‐angular, quadrangular, pentagonal and hexagonal amb, and 3‐colporate or 3‐colpate. The size of the pollen is variable among the species, ranged from 56.1 to 23.2 μm. Three pollen types: oblate spheroidal (eight species), prolate spheroidal (six species), and suboblate (two species) were observed. The surface pattern of the exine varies from echinoperforate, echinate, echinate microperforate, fenestrate, echinoperforate reticulate, microreticulate, echinate perforate, tectate, and scabrate. Exine thickness was calculated minimum in Cichorium intybus (2.47 μm) and maximum in Taraxacum campylodes (5.15 μm). A key to studied bee floral species, based on the morphological features of pollen grains, is also provided. The palynomorphological characters here analyzed can be potentially used to correctly identify the Asteraceous honeybee floral species most commonly plants visited by honeybees in the study area.

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How does micromorphology reflect taxonomy within the Xeranthemum group (Cardueae-Asteraceae)?

Cited by 7 publications

References 27 publications

Micromorphology of an involucral bract and cypselae of the endemic and relict species Amphoricarpos elegans Albov (Asteraceae, Cardueae) from the Caucasus

Micromorphology of an involucral bract and cypselae of the endemic and relict species Amphoricarpos elegans Albov (Asteraceae, Cardueae) from the Caucasus

Micromorphological and cytological comparisons between Youngia japonica and Youngia longiflora using light and scanning electron microscopy

Palynomorphological diversity among the Asteraceous honeybee flora: An aid to the correct taxonomic identification using multiple microscopic techniques

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