Effect of arsenic on legumes: analysis in the model
            <i>Medicago truncatula–Ensifer</i>
            interaction

Pajuelo, Eloísa; Rodríguez‐Llorente, Ignacio D.; Caviedes, Miguel A.

doi:10.1002/9781119409144.ch33

Cited by 3 publications

(2 citation statements)

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“…The microbial partner is reported to be more sensitive to metal stress than the host plant (Giller et al, 1999;Reichman, 2007), resulting in a decrease in nodulation performance (Pajuelo et al, 2011). Other effects of As on legumes include altered plant growth, root hairs, and photosynthesis, as well as decreased chlorophyll content (Pajuelo et al, 2011(Pajuelo et al, , 2019. Despite measurable success of revegetation at 3 years, due in part to the arsenic tolerance of umbrella thorn, tree survival, and growth were highly variable, with establishment rates that were much lower than 50%.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, knowledge of the physicochemical properties of mining wastes is a prerequisite, either for matching plant species potentially adapted to rehabilitation operations (Ntloko et al, 2021), or for improving adaptation capacities of candidate species to site-specific soils. In addition, it has been reported that the interaction of plants, soil components, and microorganisms may also be critical for the management of contaminated soils (Pajuelo et al, 2011(Pajuelo et al, , 2019Lacalle et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the Potential of Umbrella Thorn [Vachellia tortilis (Forssk.) Galasso & Banfi] for the Rehabilitation of Sub-Sahelian Mining Sites at Essakane, North-Eastern Burkina Faso

et al. 2022

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Establishment of plant communities at mine sites with significant disturbance depends upon factors such as the presence of efficient mycorrhizal fungi and rhizobia. Field and greenhouse experiments were conducted to assess growth performance of umbrella thorn as a potential tree species for reforestation of mine sites in arid areas. In the first experiment, seedlings were transplanted onto waste rock stockpile (WR) and tailings (TLG) with high arsenic (As) content on sites at the Essakane gold mine. Trees were assessed for growth and survival 3 years after planting. In experiment 2, soil was sampled on four sites across a disturbance gradient from mining waste (WR and TLG) and artisanal gold mining to undisturbed natural soil (NS). Each soil was planted with two separate leguminous trap crops (cowpea and umbrella thorn) in pots to check for microsymbionts. At 3 years, trees grew better on TLG soils with greater arsenic contamination than WRs in the field. Although tree establishment was moderate, with <50% survival, overall results suggest the ability of umbrella thorn to tolerate As contamination levels up to 1,300 ppm and, therefore, its potential for reforestation. Soil pH has shown strong effects on soil nutrient content. In particular, ammonium was the dominant form of mineral nitrogen (N) in the more neutral pH NS soils, while nitrate was present in the more alkaline WRs. Denitrification likely resulted in high N loss where nitrate dominates, reflecting the poor performance of N-deficient trees on WRs compared to TLG soils. Growth trends of umbrella thorn in potted-soils were consistent with those reported on TLG and WR soils in plantations.

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