Thlaspi sylvestre Jord. (= T. caerulescens J. & C. Presl), update on the localities and sites of a rare species in the flora of Slovenia / Thlaspi sylvestre Jord. (= T. caerulescens J. & C. Presl), dopolnjena vednost o razširjenosti in rastiščih redke ...

In the Čepovan Valley (Čepovan, hamlet Šulgi), on the northwestern rim of the Banjšice Plateau in the villages of Grudnica (in the Tolmin municipality) and near Sveto to the south of the plateau, we found new localities of Thlaspi sylvestre (T. caerulescens), which complement the existing data on the distribution of this species in Slovenia (Srednji Lokovec, Vrata), and surveyed its sites. Thlaspi sylvestre grows on meadows and pastures in the vicinity of human settlements, in hedges, on road banks, on the forest edge and in an open pioneer forest. Its most common companions are Galium mollugo agg. (G. album), Cruciata glabra, Rumex acetosa, Ranunculus acris, Taraxacum sect. Ruderalia and Veronica chamaedrys. Thlaspi sylvestre most frequently occurs in the communities from the class Molinio-Arrhenatheretea. Our findings confirm Tone Wraber’s assumption that it is not indigenous to Slovenia, and was introduced to the Banjšice Plateau as well as to Grudnica and the Čepovan Valley with human assistance (military transport during World War I). Key words: phytogeography, phytosociology, Thlaspi caerulescens, florula castrensis, Čepovan Valley, Grudnica, Banjšice, Slovenia Izvleček V Čepovanski dolini (Čepovan, zaselek Šulgi), na severovzhodnem robu Banjške planote v vasi Grudnica (občina Tolmin) in pri vasi Sveto v južnem delu te planote smo našli nova nahajališča vrste Thlaspi sylvestre (T. caerules­cens), ki dopolnjujejo njeno do zdaj znano razširjenost v Sloveniji (Srednji Lokovec, Vrata), in popisali njena rastišča. Raste na travnikih in pašnikih v okolici človeških bivališč, v mejicah, na cestnih brežinah, na gozdnem robu in v svetlem pionirskem gozdu. Njene najbolj pogoste spremljevalke so vrste Galium mollugo agg. (G. album), Cruciata glabra, Rumex acetosa, Ranunculus acris, Taraxacum sect. Ruderalia in Veronica chamaedrys. Najpogosteje raste v združbah iz razreda Molinio-Arrhenatheretea. Potrjujemo domnevo Toneta Wraberja, da ta vrsta v Sloveniji ni samonikla in da se je na Banjšice in tudi v Grudnico in Čepovansko dolino priselila s človekovo pomočjo (vojaškimi transporti med prvo svetovno vojno). Ključne besede: fitogeografija, fitocenologija, Thlaspi caerulescens, florula castrensis, Čepovanska dolina, Grudnica, Banjšice, Slovenija

Antioxidant Activity In Vitro of Selenium Polysaccharide of Thlaspi caerulescens L. Rich in Selenium

The antioxidant capacity of the human body is closely related to its ability of disease resistance and anti-aging. It is a current research focus to find effective anti-oxidants used in medicine, food, health care, beauty make-up from natural plants. In this paper, we studied the content of selenium in selenium polysaccharide and its antioxidant activity in vitro of Thlaspi caerulescens L. produced from Yutangba of Enshi selenium mining area. The double tracts atomic fluorescence spectrometry is used to detect the total selenium content in the sample and that of selenium polysaccharide in the active ingredient of the sample. The salicylic acid method and pyrogallol autoxidation method are used to detect the scavenging activity of selenium polysaccharide on hydroxyl radicals and superoxide anion. Experiments show that the total amount of selenium in Thlaspi caerulescens L. is 708ug.g-1, while the amount of selenium in selenium polysaccharide is 98.1ug.g-1, accounting 13.86% of the total selenium content. Meanwhile, selenium polysaccharide in samples is with significant antioxidant capacity, and it shows a certain dose-effect relationship. Selenium polysaccharide has stronger anti-oxidation ability than pure polysaccharide compared with non-selenium polysaccharide. Therefore, plants rich in selenium are better natural antioxidants. This study will provide the necessary experimental basis for the effective and rational development and utilization of Thlaspi caerulescens L. rich in selenium