Effects of mild and severe drought stress on the biomass, phenolic compounds production and photochemical activity of Aloe vera (L.) Burm.f.

Habibi, Ghader

doi:10.14720/aas.2018.111.2.19

Cited by 15 publications

(15 citation statements)

References 51 publications

(37 reference statements)

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“…Total phenolics decreased in all maize plants under water stress conditions, while SBE applied at different concentrations enhanced it. Dissimilar to our findings, high accumulation of total phenolics was reported in Aloe vera [ 75 ] and rice [ 76 ] varieties under water stress.…”

Section: Discussionsupporting

confidence: 84%

Sugar beet extract rich in glycine betaine modulates oxidative defense system and key physiological characteristics of maize under water-deficit stress

et al. 2021

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Now-a-days, plant-based extracts, as a cheap source of growth activators, are being widely used to treat plants grown under extreme climatic conditions. So, a trial was conducted to assess the response of two maize (Zea mays L.) varieties, Sadaf (drought tolerant) and Sultan (drought sensitive) to foliar-applied sugar beet extract (SBE) under varying water-deficit conditions. Different SBE (control, 1%, 2%, 3% & 4%) levels were used in this study, and plants were exposed to water-deficit [(75% and 60% of field capacity (FC)] and control (100% FC) conditions. It was observed that root and shoot dry weights (growth), total soluble proteins, RWC-relative water contents, total phenolics, chlorophyll pigments and leaf area per plant decreased under different water stress regimes. While, proline, malondialdehyde (MDA), RMP-relative membrane permeability, H2O2-hydrogen peroxide and the activities of antioxidant enzymes [CAT-catalase, POD-peroxidase and SOD-superoxide dismutase] were found to be improved in water stress affected maize plants. Exogenous application of varying levels of SBE ameliorated the negative effects of water-deficit stress by enhancing the growth attributes, photosynthetic pigments, RWC, proline, glycinebetaine (GB), activities of POD and CAT enzymes and levels of total phenolics, whereas it reduced the lipid peroxidation in both maize varieties under varying water stress levels. It was noted that 3% and 4% levels of SBE were more effective than the other levels used in enhancing the growth as well as other characteristics of the maize varieties. Overall, the sugar beet extract proved to be beneficial for improving growth and metabolism of maize plants exposed to water stress.

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Section: Discussionsupporting

confidence: 84%

Sugar beet extract rich in glycine betaine modulates oxidative defense system and key physiological characteristics of maize under water-deficit stress

et al. 2021

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“…Photosynthesis is sensitive to environmental changes, and under natural conditions photosynthesis is biochemically regulated in response to environmental changes to maintain a balance between the rates of component processes and metabolite concentrations (Habibi, 2018). There is limited information available regarding the eco-physiological development of Perilla plants grown under fertilizer and SA applications.…”

Section: Discussionmentioning

confidence: 99%

Influence of fertilizer and salicylic acid treatments on growth, physiological, and antioxidant characteristics in green and red Perilla frutescens varieties

Y.-J

K.-H

C.-W

et al. 2021

Not Bot Horti Agrobo

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Perilla is herbaceous plant, functional food, and nutraceutical product with antioxidant properties. The objective of this study was to investigate the growth, reflectance indices, and antioxidant properties of P. frutescens species in response to fertilizer and salicylic acid (SA) applications. Two independent experiments were carried out in an environmentally controlled greenhouse: (1) pots of red-leaf and green-leaf cultivars divided into four groups treated with 10-30-20 (10N-13.1P-16.6K), 15-10-30 (15N-4.4P-24.9K), 20-20-20 (20N-8.7P-16.6K), and 30-10-10 (30N-4.4P-8.3K) fertilizers for periods of 10 weeks, and (2) pots of red and green Perilla cultivars divided into five groups treated with 0 (control), 125, 250, 500, and 1,000 µM of SA for periods of 7 weeks. Wide variations occurred in the agronomic performance, soil-plant analysis development (SPAD) value, adjusted normalized difference vegetation index (NDVI), maximal quantum yield of PSII photochemistry (Fv/Fm), and antioxidant activity of the two Perilla varieties. All the measured traits were higher in green than in red Perilla under identical fertilizing, and all agronomic traits in green and red Perilla plants subjected to 125 and 500 μM SA were better than in controls. The SPAD and NDVI values of all plants increased as N% increased, the lowest Fv/Fm values of all plants were observed under 15-10-30 fertilizer treatment, the lowest NDVI values were detected in controls, and the Fv/Fm values of all plants decreased under 1,000 μM SA treatment. These indices can be used as indicators to characterize the physiology of these plants and are suitable for evaluating their growth and development under specific fertilizer and SA treatments. Green Perilla leaf extract (PLE) contained higher rosmarinic acid (RA) concentration in each fertilizer treatment, and higher total phenolic (TP) and RA concentration in each SA treatment. However, red PLE contained higher caffeic acid (CA) concentration than green PLE in each fertilizer and SA treatment, implying that their two genotypes exhibited different abilities and specificities of photosynthetic metabolites, and that different varieties may prepare for 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity by up-regulating TP, RA, and CA concentration differently. Thus, Perilla plants can be used as health foods due to high TP, RA, and CA concentration. To produce Perilla efficiently in industrial applications, we undertook to determine the optimum N-P-K fertilizer ratio and SA application for maximizing the growth and accumulation of TP, RA, and CA in Perilla plants.

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“…A similar result was recorded in Nigella sativa and Aloe vera species during 2DI stress. The accumulation of protective pigments such as carotenoids in leaves developed an effective photoprotection mechanism (Habibi, 2018;Kabiri et al, 2014).…”

Section: Discussion Discussion Discussionmentioning

confidence: 99%

Alterations in leaf anatomy, quality, and quantity of flavonols and photosynthetic pigments in Nigella sativa L. subjected to drought and salinity stresses

Aghajanzadeh-Gheshlaghi

Peyvandi

Majd

et al. 2021

Not Bot Horti Agrobo

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Nigella sativa was widely used for nutritional and medicinal purposes. The present study investigated the effect of drought and salinity stresses on anatomical leaves structure and some biochemical properties to increase the secondary metabolites. For salt stress plants were treated with NaCl (30, 60 mM), and for drought stress plants were irrigated daily (control), once every two days (2DI) and once every three days (3DI). Compared to control plants, 2DI, 3DI, and NaCl 60 mM treatments increase significantly leaf rutin content, while the amount of rutin in seeds of NaCl 60 mM treated plants showed a significant decrease. 3DI treatment also significantly increased rutin content in seeds compared to NaCl 30 mM and control plants. The maximum level of quercetin (0.58 mg g−1 DW), kaempferol (0.16 mg g−1 DW), and myricetin (0.04 mg g−1 DW) in leaves were gained in both NaCl treatments. However, the flavonol components were affected more at salinity conditions rather than drought. In all treated plants, the amount of these compounds in leaves was more than in seeds. The highest amount of total phenol (130 mg g−1 DW), flavonoids (11.4 mg g−1 DW), and carotenoid content (1.55 mg g−1 DW) of leaves were observed under 2DI stress. Treated plants probably encountered different changes in the anatomical structure of leaves, including the decrease of phloem area, reducing vascular bundles and diameters, decreasing the number, and increasing the volume of cortex cells. The study also corroborates the cooperation between increasing the antioxidant capacity with the total flavonoid, rutin, and quercetin. Results indicated a higher sensitivity of N. sativa to drought stress than salinity stress and indicated that moderate salinity and drought could enhance secondary metabolites of seeds in this plant. The formation of potent antioxidants via the treatments could be worthy for pharmaceutical industries.

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Effects of mild and severe drought stress on the biomass, phenolic compounds production and photochemical activity of Aloe vera (L.) Burm.f.

Cited by 15 publications

References 51 publications

Sugar beet extract rich in glycine betaine modulates oxidative defense system and key physiological characteristics of maize under water-deficit stress

Sugar beet extract rich in glycine betaine modulates oxidative defense system and key physiological characteristics of maize under water-deficit stress

Influence of fertilizer and salicylic acid treatments on growth, physiological, and antioxidant characteristics in green and red Perilla frutescens varieties

Alterations in leaf anatomy, quality, and quantity of flavonols and photosynthetic pigments in Nigella sativa L. subjected to drought and salinity stresses

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