Molecular and physiological mechanisms of plant tolerance to toxic metals

Milner, Matthew J.; Piñeros, Miguel A.; Kochian, Leon V.

doi:10.1002/9781118764374.ch7

Cited by 3 publications

(3 citation statements)

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“…This finding was in agreement with Wierzbicka [29] and Geebelen [30]. Exclusion, accumulation and sequestration in vacuoles are the strategies of plants to tolerate metal contamination [31]. Pb ions retain in the roots because of its ability to strongly bind with the cell wall ion exchangeable sites i.e.…”

Section: Resultssupporting

confidence: 87%

Untitled

2019

RJLBPCS

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Brassica juncea is extensively studied plant famous for its hyperaccumulation capacity to various heavy metals like Cd, Cr, Cu, Ni etc. However, plants within species differ in their genetic capabilities to accumulate heavy metals. In present study 10 different genotypes of B. juncea were investigated for their potential to tolerate and accumulate Lead (Pb) which is notorious for its low mobility in soil and great hazards to living beings. Screening was done at five different levels of Pb (125, 250, 500, 700, 1000 mg Pb/Kg soil). Plants were evaluated for their growth responses, Pb concentration in root and shoot and Pb accumulation per plant. Among all the tested varieties Pusa Vijay proved to be best having lowest reduction in growth and highest Pb accumulation per plant (307.9 µg/plant) and therefore considered as a suitable candidate for phytoremediation of Pb contaminated soil.

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Section: Resultssupporting

confidence: 87%

Untitled

2019

RJLBPCS

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“…These strategies include the activation of genes that encode multiple enzymatic pathways and are related to the process of metal exclusion of the plant/root or mechanisms of tolerances that allow the accumulation of the metal inside the plant [62]. …”

Section: Discussionmentioning

confidence: 99%

“…Plants have different strategies to colonize soils containing high concentrations of heavy metals and only resistant species can occupy this niche [ 61 ]. These strategies include the activation of genes that encode multiple enzymatic pathways and are related to the process of metal exclusion of the plant/root or mechanisms of tolerances that allow the accumulation of the metal inside the plant [ 62 ].…”

Section: Discussionmentioning

confidence: 99%

Endophytic fungal communities of Polygonum acuminatum and Aeschynomene fluminensis are influenced by soil mercury contamination

et al. 2017

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The endophytic fungal communities of Polygonum acuminatum and Aeschynomene fluminensis were examined with respect to soil mercury (Hg) contamination. Plants were collected in places with and without Hg +2 for isolation and identification of their endophytic root fungi. We evaluated frequency of colonization, number of isolates and richness, indices of diversity and similarity, functional traits (hydrolytic enzymes, siderophores, indoleacetic acid, antibiosis and metal tolerance) and growth promotion of Aeschynomene fluminensis inoculated with endophytic fungi on soil with mercury. The frequency of colonization, structure and community function, as well as the abundant distribution of taxa of endophytic fungi were influenced by mercury contamination, with higher endophytic fungi in hosts in soil with mercury. The presence or absence of mercury in the soil changes the profile of the functional characteristics of the endophytic fungal community. On the other hand, tolerance of lineages to multiple metals is not associated with contamination. A. fluminensis depends on its endophytic fungi, since plants free of endophytic fungi grew less than expected due to mercury toxicity. In contrast plants containing certain endophytic fungi showed good growth in soil containing mercury, even exceeding growth of plants cultivated in soil without mercury. The data obtained confirm the hypothesis that soil contamination by mercury alters community structure of root endophytic fungi in terms of composition, abundance and species richness. The inoculation of A. fluminensis with certain strains of stress tolerant endophytic fungi contribute to colonization and establishment of the host and may be used in processes that aim to improve phytoremediation of soils with toxic concentrations of mercury.

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Phytoremediation potential of ornamental plants for heavy metal removal from contaminated soil: a critical review

Deepika

Haritash

2023

Hortic. Environ. Biotechnol.

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Molecular and physiological mechanisms of plant tolerance to toxic metals

Cited by 3 publications

References 93 publications

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Endophytic fungal communities of Polygonum acuminatum and Aeschynomene fluminensis are influenced by soil mercury contamination

Phytoremediation potential of ornamental plants for heavy metal removal from contaminated soil: a critical review

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