Atmospheric Pb induced hormesis in the accumulator plant Tillandsia usneoides

Zhang, Jingyi; Sun, Xingyue; Agathokleous, Evgenios; Zheng, Guang

doi:10.1016/j.scitotenv.2021.152384

Cited by 16 publications

(2 citation statements)

References 42 publications

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“…exposed to Cd 5 mM showed a hormetic response for seven of them, namely six Cd resistance genes and glutathione-GSH [26]. Another species of Tillandsia, T. usneoides, showed a predominant biphasic hormetic response at 10 different atmospheric lead-Pb concentrations; the hormetic response was confirmed by the levels of malondialdehyde (MDA) and superoxide anion radical and the superoxide dismutase (SOD) activity after 6-12 h, as well as by GSH and metallothionein-MT content after 12 h [27]. SOD, GSH, and MT also showed a hormetic response in T. usneoides exposed to different mercury-Hg atmospheric concentrations [28].…”

Section: Potentially Toxic Elements and Eustressmentioning

confidence: 99%

Eustress and Plants: A Synthesis with Prospects for Cannabis sativa Cultivation

Berni,

Thiry,

Hausman

et al. 2024

Horticulturae

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Cannabis sativa L. is a species of great economic value. It is a medicinal plant that produces several bioactive phytochemicals, and the stems of the industrial cultivars, commonly referred to as “hemp”, are sources of both cellulosic fibers and hurds used in textiles and bio-composites. Environmental stresses of biotic and abiotic nature affect plant development and metabolism and can, consequently, impact biomass yield and phytochemical content. Stress factors can be divided into eustressors and distressors; while the former stimulate a positive response in terms of growth, productivity, and resistance, the latter impair plant development. Eustressors are factors that, applied at low–moderate doses, can improve plant performance. Several studies have investigated different types of distress in C. sativa and evaluated the impact on biomass and phytochemicals, while less attention has been paid to the study of eustress. This review discusses the concept of plant eustress by referring to the recent literature and extrapolates it to applications in C. sativa cultivation. The data available on the response of C. sativa to exogenous factors are reviewed, and then, salinity eustress applied to hemp cultivation is taken as a proof-of-concept example. The knowledge developed on plant eustress and the results collected so far are discussed in light of future applications to improve the production of biomass and phytochemicals in plants of economic interest. Emphasis is placed on the potential use of eustress in conjunction with other factors shown to impact both the physiological response and metabolism of Cannabis, among which there are macronutrients and biofertilizers. Perspectives are also drawn with respect to applying the knowledge developed on the elicitation of whole plants to Cannabis cell suspension cultures, which provide a controlled, scalable, and season-independent platform to produce secondary metabolites.

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Section: Potentially Toxic Elements and Eustressmentioning

confidence: 99%

Eustress and Plants: A Synthesis with Prospects for Cannabis sativa Cultivation

Berni,

Thiry,

Hausman

et al. 2024

Horticulturae

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“…The physical removal strategies include excavation, hydraulic ushing, and electrokinetics. A drawback of the physical removal techniques is the disruption of soil structure (Isidro et al, 2022;Kumawat et al, 2022;Zheng et al, 2022). By contrast, Pb-phytoremediation is an in-situ applicable technique that is e cient, eco-friendly, and cheap (Khan et al, 2019;Yadav et al, 2022;Singh and Pant, 2023).…”

Section: Introductionmentioning

confidence: 99%

Both tartaric and pantothenic acids promote Pb-phytoextraction potential of sunflower by regulating calcium and phosphorus uptake

Ghafoor,

Shafiq,

Anwar

et al. 2024

Preprint

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Phytoextraction of Pb is a challenging task due to its extremely low mobility within soil and plant systems. In this study, we tested the influence of some novel chelating agents for Pb-phytoextraction using sunflowers. The Pb was applied at control (0.0278 mM) and 4.826 mM Pb as Pb(NO3)2 through soil-spiking. After 10 days of Pb addition, four different organic ligands (aspartic, ascorbic, tartaric, and pantothenic acids) were added to the soil at 1 mM concentration respectively. In the absence of any chelate, sunflower plants grown at 4.826 mM Pb level accumulated Pb concentrations up to 104 µg g-1 DW in roots whereas, 64 µg g-1 DW in shoot. By contrast, tartaric acid promoted significant Pb accumulation in root (191 µg g-1 DW; +45.5%) and shoot (131.6 µg g-1 DW; +51.3%). Pantothenic acid also resulted in significant Pb-uptake in sunflower shoots (123 µg g-1 DW; +47.9%) and in roots (177.3 µg g-1 DW; +41.3%). The least effective amongst the chelates tested was ascorbic acid but it still contributed to +39.0 and 45.2% more Pb accumulation in sunflower root and shoots. In addition, plant growth, biochemical, and ionomic parameters were positively regulated by organic chelates. Especially, an increase in the leaf Ca, P, and S was evident in Pb-stressed plants in response to chelates. These results highlight that the use of biocompatible organic chelates positively alters plant physio-biochemical traits contributing to higher Pb-sequestration in sunflower plant parts.

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