scholarly journals Ukrasna svojstva, asortiman i uzgoj kukurijeka (Helleborus spp.) zimske cvatnje

2021 ◽  
Vol 44 (6) ◽  
pp. 4-12
Author(s):  
Mihael Kušen ◽  
Vesna Židovec ◽  
Tatjana Prebeg
Keyword(s):  

Vrste roda Helleborus se u ukrasnoj hortikulturi koriste kao vrtne biljke, lončanice za primjenu u vanjskom prostoru, kao vrste za uređenje interijera, a sve se više traže kao cvjetna vrsta za rez tijekom zime. Cilj ovog rada je opisati osnovne morfološke značajke i uvjete uzgoja vrsta roda Helleborus te dati pregled asortimana vrsta i kultivara kasnojesenske i zimske cvatnje. Pregledom literature utvrđeno je da Helleborus niger L., crni kukurijek, na tržištu postaje sve traženija ukrasna biljka, a prate ga i križanci između vrste H. orientalis i drugih vrsta ovoga roda (H. × hybridus). Iako tržišno slabo zastupljene u ukrasnoj hortikulturi se primjenjuju i druge vrste (H. viridis, H. foetidus, H. purpurascens, H. tibethanus, H. vesicarius te H. multifidus) te sve veći broj kultivara. Za cvatnju početkom zime, posebno u vrijeme Božića, najpoznatija je vrsta Helleborus niger L., a sve se više komercijaliziraju i međuvrsni križanci. Pri tome osobit značaj imaju križanci između vrsta H. niger, H. argutifolius Viv. i H. lividus Aiton. Razmnožavanje je moguće sjemenom, dijeljenjem te kulturom tkiva. Uzgaja se u uzgojnim posudama 12- 14 cm promjera u koje se sadi od 50. do 18. tjedna. Potreban mu je supstrat pH od 5,8 do 6,0, ne podnosi visoku razinu soli u tlu, a za prodaju početkom zime uzgaja se u zaštićenim prostorima od sredine listopada. Osjetljiv je na visoku vlagu, koja uz visoke temperature potencira pojavu bolesti (Fusarium, Pythium i Phytophtora).

2021 ◽  
Vol 75 (2) ◽  
pp. 393-402
Author(s):  
Akihito Yokosuka ◽  
Mina Inomata ◽  
Yuka Yoshizawa ◽  
Tomoki Iguchi ◽  
Yoshihiro Mimaki

Author(s):  
Eugene B. Nash ◽  
Rainer Wilbrand
Keyword(s):  

1987 ◽  
Vol 90 (3/4) ◽  
pp. 96 ◽  
Author(s):  
Sharon J. Lockhart ◽  
Mary Lewnes Albrecht
Keyword(s):  

2008 ◽  
Vol 1 ◽  
pp. 5-6 ◽  
Author(s):  
P. Jesse ◽  
G. Mottke ◽  
J. Eberle ◽  
G. Henze ◽  
A. Prokop
Keyword(s):  

2022 ◽  
Vol 17 (1) ◽  
pp. 1934578X2110694
Author(s):  
Eckehard Cuny ◽  
Franz-Dietrich Klingler

The use of medicinal herbs as remedies reaches back to the Stone Age, and their importance as a source of drugs has continuously increased since then. Herbal ingredients can serve as active pharmaceuticals themselves or as lead substances for the development of synthetic pharmaceuticals with less toxicity, higher effectiveness or with new properties. To date, only 6% of the ∼600,000 plants on earth have been tested pharmacologically. Among these, the medicinal plant Helleborus niger L. (Christmas rose) is especially promising because its leaves contain ( + )-ranuncoside 1, characterized by a spiroacetal ring system, a motif which is responsible for the biological activity of a multitude of natural products. Structure-activity relationship studies of ( + )-ranuncoside 1 are lacking and no synthesis of 1 has been described yet. Therefore, we developed a protocol for the rapid and efficient isolation of 1 from the leaves of cultivated Christmas rose. Crystals of high purity were obtained that enabled us to study the stereochemistry of 1 by NMR spectroscopy in solution for the first time. The spiro configuration, the absolute stereochemistry, and the geometry of all three rings was then confirmed by x-ray structure analysis. Our data will enable future structure-activity relationship studies to assess the potential of 1 as a lead substance for the development of novel antibiotics and anticancer agents.


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