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Ovule structure of Scotch thistle Onopordum acanthium L. (Cynareae, Asteraceae)

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Kolczyk J. , Stolarczyk P. , Plachno B. J.

nr 1

Studies concerning the ultrastructure of the periendothelial zone integumentary cells of Asteraceae species are scarce. The aim was to check whether and/or what kinds of integument modifications occur in Onopordum acanthium. Ovule structure was investigated using light microscopy, scanning electron microscopy, transmission electron microscopy and histochemistry. For visualization of calcium oxalate crystals, the polarizing microscopy was used. The periendothelial zone of integument in O. acanthium is well developed and composed of mucilage cells near the integumentary tapetum and large, highly vacuolated cells at the chalaza and therefore they differ from other integumentary cells. The cells of this zone lack starch and protein bodies. Periendothelial zone cells do not have calcium oxalate crystals, in contrast to other integument cells. The disintegration of periendothelial zone cells was observed in a mature ovule. The general ovule structure of O. acanthium is similar to other members of the subfamily Carduoideae, although it is different to “Taraxacum”, “Galinsoga” and “Ratibida” ovule types.

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

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Musial K. , Janas A. , Szelag Z.

nr 1

Chromosome numbers for 12 Hieracium s.str. species from Bulgaria, Macedonia, Montenegro, Poland, Romania and Serbia are given and their metaphase plates are illustrated. Chromosome numbers are published for the first time for H. albinum Fries 2n=4x=36, H. bukovicae Rohlena & Zahn; 2n=3x=27, H. retyezatense subsp. subatratiforme Neičeff & Zahn 2n=4x=36, H. velenovskyi Freyn 2n=3x=27, as well as two undescribed species belonging to the H. bohatschianum agg. 2n=4x=36 and H. nigrescens agg. 2n=4x=36 and a hybrid between H. naegelianum Pančić and H. bifidum s.lat. 2n=4x=36.

The rose flea beetle (Luperomorpha xanthodera, Coleoptera: Chrysomelidae), an alien species in central Poland − from an episodic occurrence in an established population

100%

Sady E. A. , Kiełkiewicz M. , Kozłowski M. W. , Sady E. A. , Kiełkiewicz M. , Kozłowski M. W.

Chromosome numbers in Hieracium (Asteraceae) from Central and Southeastern Europe III

100%

nr 2

Chromosome numbers for 13 species of Hieracium L. s.str. from Bulgaria, Macedonia, Poland and Romania are given and their metaphase plates are illustrated. Chromosome numbers are published for the first time for H. djimilense s.lat. 2n=3x=27, H. fiekii R. Uechtr. 2n=3x=27, H. glabrescens (F. W. Schultz) Murr 2n=3x=27, H. juranomorphum Zahn 2n=3x=27, H. sparsiflorum subsp. sparsiceps Zahn 2n=3x=27 and H. sparsum subsp. naegelianiforme Behr & Zahn 2n=3x=27.

Chromosome numbers in Hieracium (Asteraceae) from Central and Southeastern Europe V

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Musiał K. , Szeląg Z. , Musiał K. , Szeląg Z.

Herbicide potential of selected essential oils from plants of Lamiaceae and Asteraceae families

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Nikolova M. , Traykova B. , Yankova-Tsvetkova E. , Stefanova T. , Dzhurmanski A. , Aneva I. , Berkov S.

nr 1

Variation and relationships of morphological traits, shoot yields and essential oil contents of four Anthemis species

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Alizadeh M. A. , Jafari A. A.

nr 2

Chromosome numbers in 11 species of Taraxacum section Erythrosperma Dt. from Poland

67%

nr 2

Karyology of eleven species of Taraxacum sect. Erythrosperma from Poland has been studied. Somatic chromosome numbers are given for the following species: T. bellicum, T. brachyglossum, T. cristatum, T. disseminatum, T. dissimile, T. lacistophyllum, T. parnassicum, T. plumbeum, T. proximum, T. scanicum, and T. tenuilobum. Although the hypertriploid chromosome number was previously reported in Poland for T. lacistophyllum, T. parnassicum, T. scanicum, and T. tenuilobum, we proved the triploid chromosome number 2n = 24 in all the species investigated, which is consistent with the data reported from other regions of Europe. The chromosome numbers of T. bellicum, T. cristatum, T. disseminatum, T. dissimile, T. plumbeum, and T. proximum growing in Poland are published for the first time.