Natural bee-honey based biostimulants confer salt tolerance in onion via modulation of the antioxidant defence system

Semida, Wael M.; El–Mageed, Taia A. Abd; Hemida, Khaulood A.; Rady, Mostafa M.

doi:10.1080/14620316.2019.1592711

Cited by 42 publications

(55 citation statements)

References 66 publications

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“…Besides decreases of leaf chlorophyll index (SPAD), severe water stress decreased photosynthetic efficiency like the maximum quantum yield of PSII ( F v / F m ) and the electron flow rate through PSII (PI; Table 6 ). Chlorophyll concentration is related to the photosynthetic efficiency [ 70 , 71 , 72 ], therefore, the reduction observed in photosynthetic efficiency was associated with chlorophyll degradation [ 12 , 73 ], as occurred in the present study ( Table 6 ). Water-deficits induce degradation of D1 protein that translates into a lower value of F v / F m that represents photoinhibition [ 74 ], indicating that the damage occurred in the light-harvesting complex of PSII in drought-stressed eggplant.…”

Section: Discussionsupporting

confidence: 55%

Foliar Application of Zinc Oxide Nanoparticles Promotes Drought Stress Tolerance in Eggplant (Solanum melongena L.)

Semida

Abdelkhalik

Mohamed

et al. 2021

Plants

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161

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Water shortage and salinity are major challenges for sustaining global food security. Using nutrients in the nano-scale formulation including zinc oxide nanoparticles (ZnO NP) is a novel fertilization strategy for crops. In this study, two field-based trials were conducted during 2018 and 2019 to examine the influence of three ZnO NP concentrations (0, 50, and 100 ppm) in eggplant grown under full irrigation (100 of crop evapotranspiration; ETc) and drought stress (60% of ETc). Plant growth, yield, water productivity (WP), physiology, biochemistry, and anatomy responses were evaluated. Drought stress significantly decreased membrane stability index (MSI), relative water content (RWC), and photosynthetic efficiency, thus hampered eggplant growth and yield. In contrast, exogenous ZnO NP to water-stressed eggplant resulted in increased RWC and MSI associated with improved stem and leaf anatomical structures and enhanced photosynthetic efficiency. Under drought stress, supplementation of 50 and 100 ppm ZnO NP improved growth characteristics and increased fruit yield by 12.2% and 22.6%, respectively, compared with fully irrigated plants and nonapplied ZnO NP. The highest water productivity (WP) was obtained when eggplant was irrigated with 60% ETc and foliarly treated with 50 or 100 ppm of ZnO NP, which led to 50.8–66.1% increases in WP when compared with nontreated fully irrigated plants. Collectively, these findings demonstrated that foliar spraying ZnO NP gives the utility for alleviating drought stress effects on eggplant cultivated in saline soil.

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Section: Discussionsupporting

confidence: 55%

Foliar Application of Zinc Oxide Nanoparticles Promotes Drought Stress Tolerance in Eggplant (Solanum melongena L.)

Semida

Abdelkhalik

Mohamed

et al. 2021

Plants

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161

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“…Indeed, treated plants showed higher biomass, bulb yield, and photosynthetic pigments. Moreover, the osmoprotectans content as proline, soluble sugars and total free amino acids, the membrane stability index and the enzymatic and non-enzymatic antioxidant activity were enhanced [182]. Hence, biostimulants applied in case of salinity stress induce the accumulation of osmolytes, in order to enhance the cell osmotic potential and the level of protective molecules against oxidative stress.…”

Section: Biostimulants and Salinity Stressmentioning

confidence: 99%

Biostimulants Application in Horticultural Crops under Abiotic Stress Conditions

2019

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Abiotic stresses strongly affect plant growth, development, and quality of production; final crop yield can be really compromised if stress occurs in plants’ most sensitive phenological phases. Additionally, the increase of crop stress tolerance through genetic improvements requires long breeding programmes and different cultivation environments for crop performance validation. Biostimulants have been proposed as agronomic tools to counteract abiotic stress. Indeed, these products containing bioactive molecules have a beneficial effect on plants and improve their capability to face adverse environmental conditions, acting on primary or secondary metabolism. Many companies are investing in new biostimulant products development and in the identification of the most effective bioactive molecules contained in different kinds of extracts, able to elicit specific plant responses against abiotic stresses. Most of these compounds are unknown and their characterization in term of composition is almost impossible; therefore, they could be classified on the basis of their role in plants. Biostimulants have been generally applied to high-value crops like fruits and vegetables; thus, in this review, we examine and summarise literature on their use on vegetable crops, focusing on their application to counteract the most common environmental stresses.

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“…Although the use of commercially available plant growth stimulants such as osmoprotectants and/or antioxidants reduces the deleterious effects of abiotic stress, they are costly to growers. However, natural-based biostimulants such as plant-derived protein hydrolysate, Moringa oleifera leaves, propolis, maize grains, licorice roots, and diluted bee honey extracts are inexpensive by-products of plants or organisms that contribute to sustainable agriculture as an alternative to synthetic protectants [ 26 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. The direct effect beyond the natural-based biostimulants is due to the fact that they contain many plant growth-promoting molecules such as antioxidants, osmoprotectants, mineral nutrients, and phytohormones.…”

Section: Introductionmentioning

confidence: 99%

Exogenous Gibberellic Acid or Dilute Bee Honey Boosts Drought Stress Tolerance in Vicia faba by Rebalancing Osmoprotectants, Antioxidants, Nutrients, and Phytohormones

Rady

Boriek

El–Mageed

et al. 2021

Plants

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The use of growth regulators such as gibberellic acid (GA3) and biostimulants, including diluted bee honey (Db-H) can improve drought tolerance in many crops, including the faba bean (Vicia faba L.). Db-H contains high values of osmoprotectants, mineral nutrients, vitamins, and many antioxidants making it an effective growth regulator against environmental stress effects. Therefore, the present study was planned to investigate the potential improvement in the faba bean plant performance (growth and productivity) under full watering (100% of crop evapotranspiration (ETc)) and drought stress (60% of ETc) by foliar application of GA3 (20 mg L−1) or Db-H (20 g L−1). The ameliorative impacts of these growth regulators on growth, productivity, physio-biochemical attributes, nutrient status, antioxidant defense system, and phytohormones were evaluated. GA3 or Db-H attenuated the negative influences of drought stress on cell membrane stability, ion leakage, relative water content, nutrient status, leaf pigments related to photosynthesis (chlorophylls and carotenoids), and efficiency of the photosystem II (PSII in terms of Fv/Fm and performance index), thus improving faba bean growth, green pod yield, and water use efficiency. Drought stress caused an abnormal state of nutrients and photosynthetic machinery due to increased indicators of oxidative stress (malondialdehyde (MDA), hydrogen peroxide (H2O2) and superoxide (O2•−)), associated with increased osmoprotectants (proline, glycine betaine, soluble sugars, and soluble protein), non-enzymatic antioxidants (ascorbic acid, glutathione, and α-tocopherol), and enzymatic antioxidant activities (superoxide dismutase, catalase, glutathione reductase, and ascorbate peroxidase). However, foliar-applied GA3 or Db-H mediated further increases in osmoprotectants, antioxidant capacity, GA3, indole-3-acetic acid, and cytokinins, along with decreased levels of MDA and abscisic acid. These results suggest the use of GA3 or Db-H at the tested concentrations to mitigate drought-induced damage in bean plants to obtain satisfactory growth and productivity under a water deficit of up to 40%.

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Natural bee-honey based biostimulants confer salt tolerance in onion via modulation of the antioxidant defence system

Cited by 42 publications

References 66 publications

Foliar Application of Zinc Oxide Nanoparticles Promotes Drought Stress Tolerance in Eggplant (Solanum melongena L.)

Foliar Application of Zinc Oxide Nanoparticles Promotes Drought Stress Tolerance in Eggplant (Solanum melongena L.)

Biostimulants Application in Horticultural Crops under Abiotic Stress Conditions

Exogenous Gibberellic Acid or Dilute Bee Honey Boosts Drought Stress Tolerance in Vicia faba by Rebalancing Osmoprotectants, Antioxidants, Nutrients, and Phytohormones

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