Environmental Stress and Secondary Metabolites in Plants

Ashraf, Muhammad Arslan; Iqbal, Muhammad; Rasheed, Rizwan; Hussain, İqbal; Riaz, Muhammad; Arif, Muhammad

doi:10.1016/b978-0-12-812689-9.00008-x

Cited by 143 publications

(109 citation statements)

References 67 publications

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“…Treatments applied in this investigation had a significant effect on the alkaloid concentrations of S. tortuosum. The results obtained in this research agree with [10] and [8] which state that S. tortuosum responds to biotic and abiotic stresses by controlling their influx of secondary metabolite concentrations. It was further noticed that root extracts of plants samples had more delta 7 mesembrenone and mesembrenone concentrations than shoots, while shoots had more mesembrine.…”

Section: Discussionsupporting

confidence: 89%

“…Secondary metabolites have been reported to be responsible for antibacterial, anti-fungal and anti-viral properties exhibited by plants and are thought to play a major role in the adaptation of plants to their environment [7,8,9]. Apart from protecting plants from pathogens, they confer allelopathic properties on plants, they possess ultra-violet absorbing structures capable of protecting plants from leaf damage caused by incident light intensity, and also, they have anti-feeding properties, protecting plants from insects and even larger animals [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Variabilities in alkaloid concentration of Sceletium tortuosum (L.) N.E. Br in response to different soilless growing media and fertigation regimes in hydroponics

Faber

Laubscher

Rautenbach

et al. 2020

Heliyon

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Variabilities in alkaloid concentration of Sceletium tortuosum (L.) N.E. Br in response to different soilless growing media and fertigation regimes in hydroponics

Faber

Laubscher

Rautenbach

et al. 2020

Heliyon

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“…In beans, moderate salinity stress decreased phenols content ( Telesiñski et al., 2008 ). Proline (Pro) accumulation is also related to abiotic stress ( Wang et al., 2009 , 2011 ; Per et al., 2017 ) such as salinity and water deficit ( Hayat et al., 2012 ; Reddy et al., 2015 ; Ashraf et al., 2018 ). In tomato grown hydroponically, proline was found to be a reliable indicator of the environmental stress imposed on plants ( Claussen, 2005 ).…”

Section: Introductionmentioning

confidence: 99%

Plant growth, phytochemical accumulation and antioxidant activity of substrate-grown spinach

Machado

Alves-Pereira

Ferreira

2018

Heliyon

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Spinach production in soilless cultivation systems, mainly in substrate, transplanted with soil blocks and drip-irrigation is increasing worldwide. However, spinach establishment with soil blocks, with several seedlings per block compared with traditional planting methods, may affect light interception by plant canopy, wetting and salt patterns in root medium and therefore the plant growth and functional value of spinach. The effects of soil block number (plant density) and emitters spacing on plant growth, nitrate, proline and total phenols content and antioxidant activity were evaluated in spinach (Spinacia oleracea L). Five seedlings per soil block were transplanted to Styrofoam boxes filled with the substrate and grown during winter in an unheated greenhouse. Four treatments were carried out with two soil block numbers [8 (160 plants/m2) and 14 (280 plants/m2) soil blocks per Styrofoam box] and two emitter spacing [emitters spaced every 25 and 12.5 cm, respectively, with 4 and 8 emitters per Styrofoam box]. Neither plant density nor emitter spacing had any effect on shoot dry weight. Fresh yield increased as planting density and the number of emitters per Styrofoam box increased. The yield in Styrofoam boxes with 160 plants/m2 and 8 emitters (3.85 kg m−2) was ≈31 % lower than that obtained in treatment with 280 plants/m2 and 8 emitters (5.09 kg m−2). However, the leaf blade of the latter treatment presented a higher content of phenols and proline and greater antioxidant activity (FRAP and DPPH) as well as lower content of nitrate and lesser PDH activity. Decrease of space between emitters reduced the leaf blade nitrate concentration of spinach grown in a greenhouse during the winter. Leaf blade antioxidant activity (FRAP) decreased as planting density increased.

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“…In order to survive in salt stressed conditions, plant synthesizes a variety of chemical substances as potential growth regulators including phytohormones, osmolytes, and antioxidants (Ashraf et al, 2018). However, synthesis and accumulation of these substances depends upon type and quantum of applied stress.…”

Section: Introductionmentioning

confidence: 99%

Salicylic acid seed priming modulates some biochemical parameters to improve germination and seedling growth of salt stressed wheat (Triticum aestivum L.)

Azeem¹,

Qasim²,

Abbasi³

et al. 2018

PAK.J.BOT.

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Salicylic acid (SA) is a plant signaling molecule, which regulates various metabolic processes and involves in eliciting specific responses against abiotic/biotic stresses. Present study investigated the effect of SA on seed germination and seedling growth of salt stressed wheat. Wheat seeds were primed with water and two concentrations of SA (0.5 and 1.0 mM) for 12 h. For In-vitro experiment, seeds were soaked in 0, 50 and 100 mM NaCl solutions and seed germination and seedling growth parameters were studied. Primed seeds (both 0.5 and 1.0 mM SA) significantly improved seed germination, rate of germination, total chlorophyll, soluble sugars, proteins and phenolic content, as compared to non-primed and hydro-primed controls. For greenhouse experiment, hydro-primed (control) and SA primed (0.5 and 1.0 mM) seeds were grown in plastic pots and irrigated with 0 and 100 mM NaCl for 4 weeks. Plants emerged from SA primed seeds showed better response to salinity in which higher contents of photosynthetic pigments, soluble sugars, proteins and phenols contributed to enhanced growth and biomass production, as compare to control plants. Seed priming with 1.0 mM SA was found most effective to protect plants from damaging effects of salinity as compare to hydro-priming and 0.5 mM SA priming. Therefore, it is suggested that the priming of seeds with 1.0 mM SA can be adopted as a strategy to enhance wheat growth especially in salt affected soils.

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Environmental Stress and Secondary Metabolites in Plants

Cited by 143 publications

References 67 publications

Variabilities in alkaloid concentration of Sceletium tortuosum (L.) N.E. Br in response to different soilless growing media and fertigation regimes in hydroponics

Variabilities in alkaloid concentration of Sceletium tortuosum (L.) N.E. Br in response to different soilless growing media and fertigation regimes in hydroponics

Plant growth, phytochemical accumulation and antioxidant activity of substrate-grown spinach

Salicylic acid seed priming modulates some biochemical parameters to improve germination and seedling growth of salt stressed wheat (Triticum aestivum L.)

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