UV-Induced Changes of Active Components and Antioxidant Activity in Postharvest Pigeon Pea [<i>Cajanus cajan</i> (L.) Millsp.] Leaves

Wei, Zuo‐Fu; Luo, Meng; Zhao, Chunjian; Li, Chunying; Gu, Cheng‐Bo; Wang, Wei; Zu, Yuangang; Efferth, Thomas; Fu, Yujie

doi:10.1021/jf304973f

Cited by 39 publications

(37 citation statements)

References 34 publications

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“…Various studies also indicate that light in the ultraviolet range plays an important role in plant defenses. For example, natural or attenuated ultraviolet (especially ultraviolet-B) radiation helps protect plants from herbivores and microbial pathogens, possibly through the production of phenolic compounds and/or antioxidants (Ballaré et al, 2012;Wei et al, 2013). All shade nets reduced light intensity between 280 and 400 nm compared with ambient conditions, but there were differences between net colors (Fig.…”

Section: Resultsmentioning

confidence: 98%

Environmental Modification Inside Photoselective Shadehouses

Arthurs

Stamps²,

Giglia³

2013

horts

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Shade nets are widely used to protect floricultural crops from excessive radiation, wind, hail, and birds. Although black nets are most frequently used, growers are experimenting with colored, gray, and white dispersive netting to impact vegetative vigor, dwarfing, branching, leaf variegation, and timing of flowering. We monitored environmental data inside replicated shadehouse structures (10 × 10 × 3 m high) with full covering of red, blue, pearl, and black nets (all 50% nominal shading factor) in central Florida over 12 months. Actual photosynthetically active radiation (PAR, μmol·m−2·s−1) was reduced most by black nets (55% to 60% shading factor depending on the season) and least under red nets (41% to 51%) with blue and pearl nets intermediate. Spectral analysis revealed blue nets had distinctive peaks at the blue (450 to 495 nm) and far-red beyond 750 nm. Red nets had a minor peak ≈400 nm and major transmittance beyond 590 nm. Pearl nets transmitted more light above 400 nm compared with black nets but did not otherwise alter spectral composition in the visible range. No nets had red/far-red (R/FR) ratios (600 to 700/700 to 800 nm) significantly greater than ambient (close to 1), whereas blue nets had a consistently lowest R/FR ratio of ≈0.8. Both ultraviolet-B and ultraviolet-A (280 to 400 nm) were reduced most by pearl nets and least by red nets. We also noted elevated temperatures and wind resistance (but not relative humidity) under colored and pearl nets compared with black, probably as a result of the different net porosities. Our study documents the different environmental modifications inside structures covered with black, colored, and photoneutral translucent nets, which will help predict or interpret specific plant responses.

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Section: Resultsmentioning

confidence: 98%

Environmental Modification Inside Photoselective Shadehouses

Arthurs

Stamps²,

Giglia³

2013

horts

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“…For example, UV-B and UV-C stimulates phenolics, stilbenes and overall antioxidant activity in pigeon pea (Cajanus cajan) leaves (Colquhoun et al 2013, Wei et al 2013. A supplementary UV-B treatment also affects the total antioxidant activity in basil (Sakalauskaitė et al 2013).…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Total Phenolic Contents and Antioxidant Activity of Carrot Callus Extracts as Affected by Phenylalanine Precursor

Arafa¹,

Ibrahim²,

Aly³

2016

Plant Tissue Cult. & Biotech.

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Carrot (Daucus carota) is a valuable plant with both therapeutic and horticultural potential. Stem, petiole and root derived calli of carrot were obtained on solid MS supplemented with 1 mg/l BAP + 2 mg/l NAA. Callus cultures supplemented with different L-phenylalanine (PHE) concentrations under light and dark conditions were evaluated for their antioxidant activity and total phenolic contents. The authors showed that PHE supplementation in Daucus carota cultures was necessary to raise the extraction yield percentage. Antioxidant assays such as DPPH scavenging activity and β-carotene bleaching have been carried out. In DPPH system, callus extracts from different explants grown under light conditions displayed lower DPPH radical scavenging activity at all PHE levels compared with that grown under dark conditions. Moreover, under both light and dark conditions callus cultures grown on MS supplemented with 1 mg/l BAP + 2 mg/l NAA plus 1000 mg/l PHE were recorded to yield the maximum values as antioxidant activities. Regarding β-carotene bleaching assay, under light condition the callus extract of stem, root and petiole recorded an inhibition of linolic acid 47.9, 41.43 and 39%) which is lower compared with dark grown cultures, respectively (52.46, 72.71 and 73.26%). Effect of different concentrations of phenylalanine on the total phenolic content of carrot callus extract examined under light conditions varied from 0.33 to 2 mg/g DW and 0.51 to 3.69 mg/g DW under dark conditions as expressed *Authors for correspondence: . 208Arafa et al.by gallic acid equivalent (GAE). Our results have demonstrated that Daucus carota can be further extended to exploit its possible application for the preservation of food products as well as a health supplement and neutraceutical.

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“…The demand for more natural antimicrobial has driven scientists to examine the effectiveness of inhibitory compounds such as extracts from plants [21]. Secondary metabolites such as tannins, steroid, alkaloids, flavonoids, and glycosides have the antimicrobial properties [22,23]. The presence of these metabolites may support the antibacterial activity of seed coat and cotyledon extracts of C. cajan.…”

Section: Discussionmentioning

confidence: 99%

In Vitro Antibacterial Activities of Different Solvent Extracts of Cajanus Cajan L. Seed Coat and Cotyledon

Pratima

Marthad

2018

Asian J Pharm Clin Res

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Objectives: The present study was conducted to assess the antibacterial activity of seed coat and cotyledon of Cajanus cajan with various solvents such as petroleum ether, chloroform, ethanol, and aqueous. Methods:The crude extracts were obtained using Soxhlet successive extraction method. The antibacterial activity of seed coat and cotyledon extracts at different concentration (50 and 100 mg/mL) was evaluated against certain pathogenic Gram-positive bacteria of Bacillus subtilis, Staphylococcus aureus, and Streptococcus pneumoniae and Gram-negative bacteria of Salmonella typhi, Klebsiella pneumoniae, Escherichia coli, and Pseudomonas aeruginosa by agar well diffusion assay. Results:The results show that the ethanolic extract of seed coat had highest activity against B. subtilis (22.0±0.13 mm). Whereas, the aqueous extract of cotyledon had highest activity against S. aureus (20.0±0.02 mm) and S. typhi (20.0±0.04 mm) at 100 mg/mL. The S. pneumoniae and P. aeruginosa were completely resistant to all extracts of seed coat. Similarly, S. pneumoniae, K. pneumoniae, E. coli, and P. aeruginosa were totally resistant to all tested cotyledon extracts. The phytochemical results show the presence of alkaloids, steroids, phenols, flavonoids, tannins, lignins, glycosides, and absence of saponins in seed coat and cotyledon. Conclusion:This study shows that C. cajan seed coat and cotyledon had potential antibacterial activity against B. subtilis, S. aureus, and S. typhi. These extracts may be exploited for the development of antimicrobial and alternative remedies for infections and diseases caused by respective pathogens.

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UV-Induced Changes of Active Components and Antioxidant Activity in Postharvest Pigeon Pea [Cajanus cajan (L.) Millsp.] Leaves

Cited by 39 publications

References 34 publications

Environmental Modification Inside Photoselective Shadehouses

Environmental Modification Inside Photoselective Shadehouses

Evaluation of Total Phenolic Contents and Antioxidant Activity of Carrot Callus Extracts as Affected by Phenylalanine Precursor

In Vitro Antibacterial Activities of Different Solvent Extracts of Cajanus Cajan L. Seed Coat and Cotyledon

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