Do native grasses emerge and establish in areas rehabilitated using vetiver grass?

Dlamini, Lindokuhle X; Tedder, Michelle; Kirkman, Kevin

doi:10.2989/10220119.2022.2106304

Cited by 2 publications

(1 citation statement)

References 86 publications

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“…A study by Costa et al (2020) indicated that vetiver grass exhibits allelopathic properties towards Lactuca sativa. Furthermore, an investigation conducted by Dlamini et al (2022) observed a significant prevalence of uncovered terrain adjacent to the vetiver plant, demonstrating its inherent allelopathic potential. Meanwhile, the phytochemicals screening of root methanolic extract of vetiver grass by Muthukrishnan and Manogaran (2018) revealed positive results for saponins, flavonoids, steroids, glycosides and terpenoids.…”

Section: Introductionmentioning

confidence: 99%

Assessing the allelopathic effect of Chrysopogon zizanioides (L.) Roberty root methanolic extract on Brassica rapa subsp. chinensis var. parachinensis using an untargeted metabolomic approach

Sahrir,

Yusoff,

Azizan

et al. 2024

Chil. j. agric. res.

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Chrysopogon zizanioides (L.) Roberty, or vetiver grass, is a deep-rooted perennial grass. An examination of allelopathy using a metabolomic approach offers valuable insights into vetiver extract's mechanism of action and phytotoxicity. This study utilised an untargeted metabolomics approach through the use of choisum (Brassica rapa L. subsp. chinensis (L.) Hanelt var. parachinensis (L.H. Bailey) Hanelt) as target plant because it is easier to cultivate and susceptible to the extract. Vetiver root methanolic extracts at various concentrations (0, 0.1, 1, 10, 50, and 100 mg mL -1 ) were sprayed at 100 mL m -2 on choisum seedlings at the 2 to 3 leaves stage. After 21 d, the Soil Plant Analysis Development (SPAD) and chlorophyll content of exposed choisum were measured, and their metabolites were subjected to gas chromatography-mass spectrometer (GC-MS)-based metabolomics analysis. The result demonstrated that the 100 mg mL -1 methanolic extract significantly decreased SPAD reading by 57.29% and reduced chlorophyll content by 66.38% (chl a) and 73.49% (chl b) of choisum compared to the control. Furthermore, considerably reduced stomatal length of exposed choisum, up to 34.31%, was observed when exposed to maximum concentration (100 mg mL -1 ). In total, nine metabolites with variable importance in projection (VIP) > 1 and P < 0.05 were found and identified as amino acids and carbohydrates. The highest concentration of extract enriched pathways of propanoate, Se-compound, cysteine, and methionine metabolism in choisum, suggesting the extract induced plant stress. The findings confirm the allelopathic potential of vetiver root and provide insight into the response of choisum to the allelopathic activity of vetiver grass root methanolic extract.

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Section: Introductionmentioning

confidence: 99%

Assessing the allelopathic effect of Chrysopogon zizanioides (L.) Roberty root methanolic extract on Brassica rapa subsp. chinensis var. parachinensis using an untargeted metabolomic approach

Sahrir,

Yusoff,

Azizan

et al. 2024

Chil. j. agric. res.

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Impact of fire exclusion and aspect on soil carbon fractions in Afromontane grasslands, Cathedral Peak, South Africa

Dlamini,

Kotzé,

Thevenot

et al. 2024

European J Soil Science

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Despite the importance of South Africa's Afromontane grasslands for ecosystem services (water supply and biodiversity), soil organic carbon (SOC) research remains limited. These grasslands evolved with fire, and fire exclusion leads to native plant afforestation. This study investigated SOC fractions and origin to understand the impact of fire‐exclusion‐driven afforestation and aspect on SOC storage in Afromontane grasslands. This study in Cathedral Peak Research Catchments, initiated in the 1940s, compared an afforested fire‐excluded site (AF) to a periodically burnt (accidental fires, 2–5 years interval) grassland (PB) within the same catchment (Catchment‐IX). Additionally, it compared a south‐facing periodically burnt grassland (Catchment‐IX) to a north‐facing biennially burnt grassland (Catchment‐VI). Soil samples collected at soil‐depth increments (0–5, 5–10, 10–15, 15–20, 20–30, 30–60 and 60–100 cm) revealed that, within Catchment IX, PB had more topsoil SOC stocks and microbial activity than AF but similar active carbon (C) concentrations. As expected, δ13C values revealed that SOC in PB originates from C4 grasses, whilst it mostly originates from C3 plants in AF. The south‐facing slope (Catchment‐IX) had more SOC stocks, microbial activity and active C compared to the north‐facing slope (Catchment‐VI). Fire‐exclusion‐driven afforestation changed SOC input from roots to litter, thus reducing SOC storage. Cooler south‐facing slopes are better C reservoirs. Afromontane grasslands show greater potential for C sequestration than afforested systems.

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Do native grasses emerge and establish in areas rehabilitated using vetiver grass?

Cited by 2 publications

References 86 publications

Assessing the allelopathic effect of Chrysopogon zizanioides (L.) Roberty root methanolic extract on Brassica rapa subsp. chinensis var. parachinensis using an untargeted metabolomic approach

Assessing the allelopathic effect of Chrysopogon zizanioides (L.) Roberty root methanolic extract on Brassica rapa subsp. chinensis var. parachinensis using an untargeted metabolomic approach

Impact of fire exclusion and aspect on soil carbon fractions in Afromontane grasslands, Cathedral Peak, South Africa

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