Chromosome Numbers in Hieracium (Asteraceae) from Central and Southeastern Europe II

Musiał, Krystyna; Janas, Agnieszka; Szeląg, Zbigniew

doi:10.1515/abcsb-2016-0007

Cited by 9 publications

(12 citation statements)

References 10 publications

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“…Within Hieracium s. str., diploids, triploids, tetraploids and very rare pentaploids are known (Musiał and Szeląg 2015 , 2019 ). Pilosella shows a broad range of ploidy levels, i.e.…”

Section: Introductionmentioning

confidence: 99%

In search of female sterility causes in the tetraploid and pentaploid cytotype of Pilosella brzovecensis (Asteraceae)

2021

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Within the agamic Pilosella complex, apomixis (asexual reproduction through seed) involves apospory, parthenogenesis, and autonomous endosperm development. Observations of reproductive biology in P. brzovecensis throughout four growing seasons in the garden have shown that both tetraploid and pentaploid plants of this species do not produce viable seeds and reproduce exclusively vegetatively by underground stolons. The reasons for the seed development failure were unknown, therefore our research focused on the analysis of reproductive events in the ovules of this taxon. We found that apospory was initiated in the ovules of both cytotypes. Multiple aposporous initial (AI) cells differentiated in close proximity to the megaspore mother cell (MMC) and suppressed megasporogenesis at the stage of early prophase I. However, none of the AI cells was able to further develop into a multi-nucleate aposporous embryo sac (AES) due to the inhibition of mitotic divisions. It was unusual that callose was accumulated in the walls of AI cells and its synthesis was most likely associated with a response to the dysfunction of these cells. Callose is regarded as the isolating factor and its surprising deposition in the ovules of P. brzovecensis may signal disruption of reproductive processes that cause premature termination of the aposporous development pathway and ultimately lead to ovule sterility. The results of our embryological analysis may be the basis for undertaking advanced molecular studies aimed at fully understanding of the causes of female sterility in P. brzovecensis.

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“…Within Hieracium s. str., diploids, triploids, tetraploids and very rare pentaploids are known (Musiał and Szeląg 2015 , 2019 ). Pilosella shows a broad range of ploidy levels, i.e.…”

Section: Introductionmentioning

confidence: 99%

In search of female sterility causes in the tetraploid and pentaploid cytotype of Pilosella brzovecensis (Asteraceae)

2021

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“…1b and c Our chromosome numbers well match those previously published for H. bifidum s.lat. from Poland and Romania, and triploids predominate in Poland (Mráz and Szeląg, 2004;Ilnicki and Szeląg, 2011;Musiał et al, 2016Musiał et al, , 2017. Hieracium bohatschianum agg.…”

Section: Resultsmentioning

confidence: 99%

“…This paper continues a series on the karyology of Hieracium L. in Central and Southeastern Europe conducted at the Department of Plant Cytology and Embryology of the Jagiellonian University (Musiał and Szeląg, 2015;Musiał et al, 2016Musiał et al, , 2017. Knowledge of the ploidy level, which in Hieracium s.str.…”

Section: Introductionmentioning

confidence: 90%

Acta Biologica Cracoviensia s. Botanica

Musiał¹,

Janas²,

Szeląg³

2018

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and Slovakia are given and their metaphase plates are illustrated. Chromosome numbers are published for the first time for H. vagneri Pax s.str. (2n = 4x = 36), H. wiesbaurianum subsp. herculanum Zahn (2n = 4x = 36), H. wiesbaurianum subsp. kelainephes Nyár. & Zahn (2n = 3x = 27), as well as for two undescribed species of hybrid origin between H. umbellatum L. and H. wiesbaurianum s.lat. (2n = 3x = 27), and between H. sparsum Friv. and H. schmidtii s.lat. (2n = 3x = 27), and for three undescribed species of the H. djimilense agg. (2n = 3x = 27), H. heldreichii agg. (2n = 3x = 27), and H. sparsum agg. (2n = 3x = 27). Furthermore, the chromosome numbers of two undescribed species of hybrid origin between H. umbellatum L. and H. wiesbaurianum s.lat. (2n = 3x = 27), and between H. sparsum Friv. and H. schmidtii s.lat. (2n = 3x = 27) are given. A new, tetraploid chromosome number is given for H. barbatum Tausch from the northernmost locality of the species in Europe.

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“…both species are tetraploid (Musiał & Szeląg 2023;grabowska-Joachimiak & Szeląg, unpubl. ) and belong to the H. carpathicum agg.…”

Section: Taxonomic Treatmentunclassified

Two new species in Hieracium sect. Alpestria (Asteraceae) from Mt. Babia Góra, Western Carpathians, Poland

SZELĄG

2024

Phytotaxa

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Two apomictic, tetraploid (x=9) species in Hieracium sect. Alpestria are described from Mt. Babia Góra, the northernmost mountain massif in the whole Carpathian chain with an alpine belt. Hieracium babiogorense combines the morphological features of H. prenanthoides s.lat. and H. bifidum s.lat., and H. besseri is of presumably hybrid origin between H. prenanthoides s.lat. and H. caesium s.lat. Both new species are illustrated with photos of the holotypes and live plants in the type localities.

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Chromosome Numbers in Hieracium (Asteraceae) from Central and Southeastern Europe II

Cited by 9 publications

References 10 publications

In search of female sterility causes in the tetraploid and pentaploid cytotype of Pilosella brzovecensis (Asteraceae)

In search of female sterility causes in the tetraploid and pentaploid cytotype of Pilosella brzovecensis (Asteraceae)

Acta Biologica Cracoviensia s. Botanica

Two new species in Hieracium sect. Alpestria (Asteraceae) from Mt. Babia Góra, Western Carpathians, Poland

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