Temperature stress can alter the photosynthetic efficiency and secondary metabolite concentrations in St. John's wort

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

doi:10.1016/j.plaphy.2005.07.013

Cited by 229 publications

(110 citation statements)

References 22 publications

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“…Our results were in agreement with the findings of Oh et al (2009) who have found that low temperatures caused an increase in total phenolics content in lettuce. The same was reported for Hypericum perforatum (Zobayed et al, 2005). The effect of altitudinal variation also caused an increase in total phenolic and flavanoid contents and antioxidant activity in bamboo Indocalamus latifolius (Ni et al, 2013).…”

Section: Discussionsupporting

confidence: 79%

Seasonal Variations in Total Antioxidant Capacity and Total Phenolics Content of Leaves of <i>Phyllostachys<i> Taxa Using Different Extraction Methods

Neményi

Stefanovitsné-Bányai

Burján

et al. 2014

Not Bot Hort Agrobot Cluj

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Changes in total phenolic content (TP) and total antioxidant capacity (AC) during the vegetation period (April-November) were analysed in Phyllostachys aureosulcata f. aureocaulis (PAA), P. flexuosa (PF), P. humilis (PH), P. sulphurea var. sulphurea (PSS). Different extraction methods were compared: infusion or decoction with water or aqueous methanol. The highest significant value for TP was measured in the case of infusion at 90 °C for 5 min, which lead to the highest value for AC. During the vegetation period the highest values of TP were measured in April and May in the case of PAA (409.5; 314.9 and 258.7; 119.0 µg GA/ml) and PH (388.4; 411.6 and 252.9; 253.3 µg GA/ml). There was a clear trend in the changes of TP, with high values in April and November and a peak during August-September. Similar to TP, the highest values of AC were measured in April and May in PH (519.7; 566.3 and 513.5; 510.4 µg AA/ml) and PAA (534.5; 337.8 and 394.9; 275.4 µg AA/ml). We compared the change of TP in all taxa with stress index values derived from daily maximum and minimum air temperature, cumulative precipitation plus irrigation and cumulative evapotranspiration values. A close correlation R 2 = 0.32 (p=0.001) was found between stress index values and the change in TP of all taxa. The correlation is even closer R 2 = 0.52 (p=0.001) with PF, PH and PSS. Our results with PAA can be explained by possible inter/intra-specific differences in freeze tolerance and cold-acclimation.

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Section: Discussionsupporting

confidence: 79%

Seasonal Variations in Total Antioxidant Capacity and Total Phenolics Content of Leaves of <i>Phyllostachys<i> Taxa Using Different Extraction Methods

Neményi

Stefanovitsné-Bányai

Burján

et al. 2014

Not Bot Hort Agrobot Cluj

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“…The extraction, isolation and chemical analysis methods for hypericin and pseudohypericin were as described by Zobayed et al (2005). Hy-G concentration was calculated by summing the hypericin and pseudohypericin concentrations.…”

Section: Determination Of Hypericin Pseudohypericin and Emodin Concementioning

confidence: 99%

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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“…SOD (superoxide dismutase), APX (ascorbate peroxidase), GPX (glutathione peroxidase), CAT (catalase), (Zobayed et al 2005). Parallelism between these enzymes, stress induced lipid peroxidation and stress tolerance has been previously reported (Zobayed et al 2005;Wu et al 2012).…”

Section: Enzymatic Activitymentioning

confidence: 94%

Tyrosine-priming modulates phenylpropanoid pathway in maize grown under different pH regimes

Mahmood

Hussain

Ashraf

et al. 2017

Cereal Research Communications

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Alkaline and acidic pH of soil limit crop yield. Products of phenylpropanoid pathway play a key part in plant abiotic stress tolerance. It was aimed to assess efficacy of tyrosinepriming for activation of enzyme involved in phenolic accumulation induction of pH tolerance in maize seedlings. Seeds of two maize cultivars, namely Sadaf (pH tolerant) and S-2002 (pH sensitive), were grown under three pH levels (3, 7 and 11). Eight and twelve days old seedlings were harvested and parted into roots and shoots for the assessment of growth, enzymatic and non-enzymatic antioxidants. PAL activity was directly correlated with total soluble phenolics, flavonoids, growth and seedling vigour. Lower accumulation of phenolics and PAL activity in the pH sensitive (S-2002) cultivar indicated greater oxidative damage caused by pH extremes. Priming improved antioxidative potential by enhancing PAL activity and phenolics accumulation and hence increased growth in maize seedlings.

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Temperature stress can alter the photosynthetic efficiency and secondary metabolite concentrations in St. John's wort

Cited by 229 publications

References 22 publications

Seasonal Variations in Total Antioxidant Capacity and Total Phenolics Content of Leaves of <i>Phyllostachys<i> Taxa Using Different Extraction Methods

Seasonal Variations in Total Antioxidant Capacity and Total Phenolics Content of Leaves of <i>Phyllostachys<i> Taxa Using Different Extraction Methods

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

Tyrosine-priming modulates phenylpropanoid pathway in maize grown under different pH regimes

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