Impact and status of invasive alien plant species (IAPS), Nicotiana glauca, in Eastern and Southern Zones of Tigray regional state, Ethiopia

Ayenew, Ashenafi; Faris, Girum; Seifu, Amare; Merawi, Edget; Seboka, Nigusse; Misganaw, Manaye; Bekeke, Tesfaye

doi:10.15406/bij.2018.02.00086

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…It is included in the Global Invasive Species Database (Global Invasive Species Database 2019) due to its high invasion potential. Nicotiana glauca disturbs ecosystem structures and reduces native biodiversity by growing in a wide variety of open and disturbed habitats including roadsides and lakeshores and has become a problem in relatively dry areas (Thomas et al 2016;Ayenew et al 2018). Its capacity of water conservation by stomatal closure and osmotic adjustment, as well as the presence of leaf wax that reduces the absorption of excess radiation provide tree tobacco with the ability to invade disturbed areas subject to salinity, drought and high radiation (González et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Journal of Plant Protection Research

Ibáñez¹,

Blázquez²

2019

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The chemical composition of tea tree (Melaleuca alternifolia) and wintergreen (Gaul theria procumbens) essential oils as well as their phytotoxic effects against two invasive species -Cortaderia selloana and Nicotiana glauca -were studied. Fifty-eight compounds accounting for 98.89-99.94% of the total commercial tea tree and wintergreen essential oils were identified by Gas Chromatography-Mass Spectrometry (GC-MS) analysis. Tea tree essential oil with terpi nen-4-ol (28.37 ± 0.05%) followed by 1,8-cineole (15.81 ± 0.06%), γ-terpinene (15.60 ± 0.03%), α-pinene (10.92 ± 0.08%) and α-terpinene (8.52 ± 0.01%) as the main compounds did not produce significant effects against seed germination and hypocotyl growth of N. glauca, but showed significant effects in seed germination inhibition of C. selloana (34.69%) as well as in hypocotyl (60.96%) and radicle (62.55%) growth, at the highest dose (1 µl ⋅ ml -1 ) assayed. High amounts of methyl salicylate (99.63 ± 0.02%) were found in G. procumbens essential oil with remarkable phytotoxic effects in C. seollana. Methyl salicylate inhibited seed germination (77.38%) and hypocotyl and radicle growth (96.38% and 96.65%, respectively) at the highest dose (1 µl ⋅ ml -1 ) assayed. Wintergreen essential oil constitutes an eco-friendly alternative to control the high capacity of invasiveness of C. selloana.

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Section: Introductionmentioning

confidence: 99%

Journal of Plant Protection Research

Ibáñez¹,

Blázquez²

2019

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Recruitment credit cannot compensate for extinction debt in a degraded dry Afromontane forest

Hishe

Giday

Fremout

et al. 2022

J Vegetation Science

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Question Anthropogenic disturbances severely affect dryland forests worldwide, but their effects on woody species population structure and long‐term persistence remain poorly understood. Location The research was conducted in Desa'a, a dry Afromontane forest in northern Ethiopia, Tigray region. Aims Woody species diversity, extinction debt, recruitment credit and colonisation credit were quantified and mapped based on an inventory of mature and regenerating individuals in 303 systematically sampled plots. Methods To assess tree species population dynamics at the neighbourhood scale, each plot was pooled with 16 neighbouring plots, in which species composition in the mature and regeneration layers was compared to determine the number of regenerating species, extinction debt, recruitment credit and colonisation credit. At the regional scale (150,000 ha), all plots were pooled to obtain the number of regenerating species, extinction debt and recruitment credit. Results The average density of the mature layer was 1,482 individuals per ha, representing 84 species and 44 families, with Juniperus procera and Olea europaea dominating. The regeneration layer had an average density of 14,909 individuals per hectare, with Dodonaea angustifolia and Cadia purpurea dominating. At the neighbourhood scale, the average number of regenerating species, extinction debt, recruitment credit and colonisation credit amounted to 12, 13, 5 and 68 species. Regionally, there were 58 regenerating species, an extinction debt of 26 species, and a recruitment credit of 12 species. Extinction debt was more than twice as high as recruitment credit at both the neighbourhood and regional scale. Conclusion Although regeneration density seemed sufficient to maintain forest density, it consisted of only a few species and is inadequate to maintain species diversity. It is urgent that forest managers recognise this and step‐up conservation and restoration efforts in this important forest relic. Assisted restoration is needed for those species potentially at risk of extinction.

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Preliminary screening of Nicotiana glauca extracts for determination of antioxidant activity by different methods

Trifa

Akkal

Lefahal

et al. 2020

Current Issues in Pharmacy and Medical Sciences

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Nicotiana glauca (Solanaceae), or tree tobacco, is found in dry arid climates of North America, Africa and Europe. It has been reported to have both toxic and medicinal properties. The main aim of this study was to analyze the phytochemical screening and quantitative estimation of polyphenols, flavonoids and flavonols of crude extracts from the leaves of Nicotiana glauca and to evaluate its in vitro antioxidant properties. Three different solvents were used to extract bioactive compounds from powdered leaves of Nicotiana glauca: dichloromethane (DCM), ethyl acetate (AE) and n-buthanol (n-BuOH). The three extracts were then subjected to qualitative phytochemical screening using standard procedures. Total phenolics, total flavonoids and total flavonols contents of the extracts were measured by Folin Ciocalteu and Aluminium chloride methods respectively. Furthermore, the antioxidant capacity evaluation was performed using the DPPH, ABTS, DMSO alcalin, Phenantroline, FRAP and CUPRAC methods. The three extracts were then subjected to qualitative phytochemical screening using standard procedures. These methods showed the presence of polyphenols and comarines in all extracts. Moreover, flavonoids, tannins, steroids and quinones were reported in the AE and n-BuOH extracts. In addition, alkaloids were seen to be present in DCM extract, while saponines and phlobatannins were absent in all extracts. The antioxidant capacity evaluation was performed using the DPPH, ABTS, DMSO alcalin, Phenantroline, FRAP and CUPRAC methods.Results using the DPPH method showed strong free radical scavinging activity for three extracts. This activity decreased with increasing concentration in the following order: n-BuOH>AE>DCM. In other assays, all extracts showed good antioxidant activity which decreased with increasing concentration in the following order: AE > n-BuOH > DCM. Extracts were compared with standards: BHT, BHA, Tanic acid and α-Tocopherol. The antioxidant of these extracts is probably related to polyphenols content (351.55±0.07, 284.98±0.08 and 133.8±0.06 mg/g), flavonoids (105.97±0.04, 164.44±0.07 and 1.18±0.005 mg/g) and flavonols (22.41±0.24, 18.75±0.46 mg/g) in AE and n-BuOH, respectively.As a conclusion, the results of the present study indicate that Nicotiana glauca leaves could be considered as a potential source of natural antioxidants.

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Impact and status of invasive alien plant species (IAPS), Nicotiana glauca, in Eastern and Southern Zones of Tigray regional state, Ethiopia

Cited by 4 publications

References 8 publications

Journal of Plant Protection Research

Journal of Plant Protection Research

Recruitment credit cannot compensate for extinction debt in a degraded dry Afromontane forest

Preliminary screening of Nicotiana glauca extracts for determination of antioxidant activity by different methods

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