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Determination of lotaustralin in Rhodiola species

100%

Gryszczynska A., Lowicki Z., Opala B., Krajewska-Patan A., Buchwald W., Czerny B., Mielcarek S., Mrozikiewicz P. M.

Herba Polonica

2013

tom 59

nr 2

In our research, the concentration of lotaustralin in the roots of two species Rhodiola kirilowii and Rhodiola rosea were compared. Aqueous and hydroalcoholic extracts from those plants were analyzed too. To determine the content of this compound the ultra performance liquid chromatography – tandem mass spectrometry (UPLC-MS/MS, Waters) was used. The obtained results showed that the content of measured lotaustralin depends on the species of Rhodiola. R. rosea roots are the richer source of lotaustralin then R. kirilowii. The same situation was observed in the extracts. A hydroalcoholic extract from R. rosea contains up to 135.276 mg of lotaustralin in 100 g of dry powdered material. In the case of R. kirilowii extracts, an aqueous extract contained more lotaustralin (74.791 mg/100 g of dry powdered material) then a hydroalcoholic extract.

Does cyanogenesis influence host alternation of bird cherry-oat aphid?

84%

Leszczynski B., Jozwiak B., Urbanska A., Dixon A. F. G.

Electronic Journal of Polish Agricultural Universities. Series Biology

2003

tom 06

nr 1

Changes in content of cyanogenic glycosides and in cyanogenesis potential within the bird cherry leaves during occurrence of the bird cherry-oat aphid, Rhopalosiphum padi L. and while its spring host-plants alternation have been studied. The highest content of the cyanogenic glycosides and the highest cyanogenesis potential was found in the youngest leaves of the primary host during occurrence of the first fundatrices. When the aphid population started to build up, a decrease in content of the cyanogenic glycoside and in the cyanogenesis potential was observed. Finally, when the winged migrants began to fly off from the primary host onto cereals, pretty low amount of the plant xenobiotics was recorded within the bird cherry leaves. Possible role of the cyanogenesis in host alternation of the bird cherry-oat aphid is discussed.

Cyanide action in plants - from toxic to regulatory

67%

Siegien I., Bogatek R.

Acta Physiologiae Plantarum

2006

tom 28

nr 5

Recent biochemical and genetic studies on hydrogen cyanide (HCN) metabolism and function in plants were reviewed. The potential sources of endogenous cyanide and the pathways of its detoxification are outlined and the possible signaling routes by which cyanide exerts its physiological effects are discussed. Cyanide is produced in plant tissues as the result of hydrolysis of cyanogenic compounds and is also released as a co-product of ethylene biosynthesis. Most cyanide produced in plants is detoxified primarily by the key enzyme P-cyanoalanine synthase. The remaining HCN at non-toxic concentration may play a role of signaling molecule involved in the control of some metabolic processes in plants. So, HCN may play a dual role in plants, depending on its concentration. It may be used in defense against herbivores at high toxic concentration and may have a regulatory function at lower concentration. Special attention is given to the action of HCN during biotic and abiotic stresses, nitrate assimilation and seed germination. Intracellular signaling responses to HCN involve enhancement of reactive oxygen species (ROS) generation and the expression of cyanide-insensitive alternative oxidase (AOX) and ACC synthase (ACS) genes. The biochemical and cellular mechanisms of these responses are, however, not completely understood.

Ograniczanie wyników

1 Acta Physiologiae Plantarum

1 Electronic Journal of Polish Agricultural Universities. Series Biology

1 Herba Polonica

1 Bogatek R.

1 Buchwald W.

1 Czerny B.

1 Dixon A. F. G.

1 Gryszczynska A.

1 Jozwiak B.

1 Krajewska-Patan A.

1 Leszczynski B.

1 Lowicki Z.

1 Mielcarek S.

1 Mrozikiewicz P. M.

1 Opala B.

1 Siegien I.

1 Urbanska A.

1 2013

1 2006

1 2003

Wyniki wyszukiwania

Determination of lotaustralin in Rhodiola species

Does cyanogenesis influence host alternation of bird cherry-oat aphid?

Cyanide action in plants - from toxic to regulatory