Phytochemical and physiological changes in the leaves of St. John's wort plants under a water stress condition

Zobayed, S. M. A.; Afreen, F.; Kozai, Toyoki

doi:10.1016/j.envexpbot.2005.10.002

Cited by 129 publications

(68 citation statements)

References 18 publications

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“…Hy-G biosynthesis may lie on the polyketide pathway, presumably through emodin (Mazur et al, 1992), an anthraquinone, and with proto-hypericin as the penultimate precursor (Zobayed et al, 2006), and through the successive condensation of small carboxylic acids (Katz and Donadio, 1993) such as acetate and malonate. Acetate is generated as a product of glycolysis, as the result of fatty acid metabolism by b-oxidation, or by other pathways, and malonyl CoA can be derived from acetyl CoA by the addition of CO 2 as catalysed by acetyl CoA carboxylase (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Plant–Environment Interactions: Accumulation of Hypericin in Dark Glands of Hypericum perforatum

et al. 2006

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Background and Aims Hypericum perforatum is a perennial herbaceous plant and an extract from this plant has a significant antidepressant effect when administered to humans. The plant is characterized by its secretory glands, also known as dark glands, which are mainly visible on leaves and flowers. The current study evaluates the influence of several environmental factors and developmental stages of the plant on the accumulation and synthesis of hypericin and pseudohypericin (Hy-G), the major bioactive constituents, in H. perforatum plants.Methods The appearance of dark glands on different parts of the plant, under several environmental conditions, was monitored by microscopy. Hy-G concentrations were quantified by high-performance liquid chromatography.Key Results A significant presence of dark glands accompanying the highest concentrations of Hy-G was observed in the stamen tissues more than in any other organ of H. perforatum. A linear relationship between the number of dark glands and net photosynthetic rate of the leaf and Hy-G concentration in the leaf tissue was also established. A very high concentration of Hy-G was measured in the dark-gland tissues, but in the tissues without any dark glands it was almost absent. The presence of emodin, a precursor of Hy-G, at a high concentration in the dark-gland tissues, and its absence in the surrounding tissues was also observed, suggesting that the site of biosynthesis of Hy-G is in the dark-gland cells. A significantly low concentration of Hy-G (occasionally non-detectable) was measured in the xylem sap of the stem tissues. The dark-gland tissues collected from leaves, stems or flowers contained similar concentrations of Hy-G.Conclusions The concentration of Hy-G in various organs of H. perforatum plants is dependent on the number of dark glands, their size or area, not on the location of the dark glands on the plant. The study provides the first experimental evidence that Hy-G is synthesized and accumulates in dark glands.

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Section: Discussionmentioning

confidence: 99%

“…Pathway for the synthesis of Hy-G from emodin in the cells of dark glands. Drawn from the data presented by Katz and Donadio (1993), Birch (1967), Zobayed et al (2006) and the current study.…”

Section: P H O T O S Y N T H E S Ismentioning

confidence: 99%

Plant–Environment Interactions: Accumulation of Hypericin in Dark Glands of Hypericum perforatum

et al. 2006

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“…Carbohydrates, which among other substrates are essential for cell growth, are produced via photosynthesis and the latter is significantly reduced under stress conditions (Zobayed et al, 2007). production.…”

Section: Introductionmentioning

confidence: 99%

Simulated Drought and Salinity Modulates the Production of Phytochemicals in Acalypha wilkesiana

Odjegba¹,

Alokolaro²

2013

JPS

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In this study, 3-month old Acalypha wilkesiana plants grown from stem cuttings were exposed to simulated drought and salinity separately to assess the effects of such abiotic factors on the phytochemical production level in this plant. Preliminary study, based on the qualitative analysis, showed the presence of alkaloids, cardial glycosides, flavonoids, saponins, steroids, and tannins in A. wilkesiana leaves. Results of the quantitative analysis showed that plants under drought and salinity stresses produce lower quantity of alkaloids, flavonoids, and tannins while saponin production was increased.

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“…수분 스트레스에 대한 반응으로 작물 은 일반적으로 활성산소종을 제거하는 peroxidases, superoxide dismutase, catalase 등과 같은 효소적 항산화물질과 phytochemical 같은 비효소적 항산화물질이 축적을 증가시킨다 Sofo et al, 2005). 식물체가 수분 스트레스를 받으면 α-tocopherol, β-carotene, flavonoid 등과 같은 phytochemical 의 합성이 유도되는 것으로 보도되고 있다 (Keles & Öncel, 2002;Munné-Bosch et al, 2001;Tattini et al, 2004;Zobayed et al, 2007). (Woo et al, 2010).…”

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“…에탄올 추출물의 항산화활성 검정 에탄올 추출물에 대한 항산화활성은 DPPH (1,1-diphenyl-2-picrylhydrazyl, Sigma-Aldrich) 및 ABTS (2,2'-azino-bis-3-ethylbenzo-thiazoline-6-sulfonic acid, Sigma-Aldrich) radical 의 소거활성을 측정하였다 (Choi et al, 2006) (Jung et al, 2011;Evans et al, 1991;Griffin & Saxton, 1988;Scott et al, 1989). Sofo et al, 2005) 많은 식물에서 α-tocopherol, β-carotene, flavonoid 등 과 같은 phytochemical을 유도하는 것으로 알려져 있다 (Keles & Öncel, 2002;Munné-Bosch et al, 2001;Tattini et al, 2004;Zobayed et al, 2007). 전반적으로 항산화성분의 함 량은 큰 차이를 보이지 않았지만 팥의 재배에 있어 토양의 배수상태에 따라 알맞은 배수방법을 선택해야 할 것으로 보 이며, 환경조건 등 보다 많은 변수에 대한 다각적인 분석이 필요할 것으로 보인다.…”

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Effects of the Drainage Methods on Antioxidant Compounds and Antioxidant Activity of Ethanolic Extracts on Adzuki Bean

Woo¹,

Jung²,

Song³

et al. 2014

Korean Journal of Crop Science

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Phytochemical and physiological changes in the leaves of St. John's wort plants under a water stress condition

Cited by 129 publications

References 18 publications

Plant–Environment Interactions: Accumulation of Hypericin in Dark Glands of Hypericum perforatum

Plant–Environment Interactions: Accumulation of Hypericin in Dark Glands of Hypericum perforatum

Simulated Drought and Salinity Modulates the Production of Phytochemicals in Acalypha wilkesiana

Effects of the Drainage Methods on Antioxidant Compounds and Antioxidant Activity of Ethanolic Extracts on Adzuki Bean

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