Heavy metal tolerance of orchid populations growing on abandoned mine tailings: A case study in Sardinia Island (Italy)

Agostini, Antonio De; Caltagirone, Claudia; Caredda, Alessia; Cicatelli, Angela; Cogoni, Annalena; Farci, Domenica; Guarino, Francesco; Garau, Alessandra; Labra, Massimo; Lussu, Michele; Piano, Dario; Sanna, Cinzia; Tommasi, Nicola; Vacca, Andrea; Cortis, Pierluigi

doi:10.1016/j.ecoenv.2019.110018

Cited by 55 publications

(24 citation statements)

References 47 publications

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“…The fluorescence was recorded with an infrared optical bandpass filter in the range of 700–780 nm. The maximum fluorescence (F m ), the fluorescence in ambient light (F 0 ), and the photosynthetic yield (Y) were used as a discriminant of the photosynthetic activity ( De Agostini et al, 2020 ) between etiolated capsules and controls, with the latter represented by leaves and non-etiolated capsules. All the measurements were performed in three repetitions, each in a different leaf or capsule from three different plants, finally providing a dataset of nine measurements shown here as mean ± SD for each studied condition.…”

Section: Methodsmentioning

confidence: 99%

The Impact of Fruit Etiolation on Quality of Seeds in Tobacco

et al. 2020

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Seed’s maturity and integrity are essential requirements for germination, and they rely on nutrients availability and a correct phytohormones’ balance. These aspects are prerequisites for prompt germination at the end of the dormancy period and strictly depend on chloroplast metabolism and photosynthesis. In the present work, capsules of Nicotiana tabacum were grown in dark during the whole post-anthesis period. Among others, photosynthetic rates, dormancy, and phytohormones levels in seeds were found to be significantly different with respect to controls. In particular, etiolated capsules had expectedly reduced photosynthetic rates and, when compared to controls, their seeds had an increased mass and volume, an alteration in hormones level, and a consequently reduced dormancy. The present findings show how, during fruit development, the presence of light and the related fruit’s photosynthetic activity play an indirect but essential role for reaching seeds maturity and dormancy. Results highlight how unripe fruits are versatile organs that, depending on the environmental conditions, may facultatively behave as sink or source/sink with associated variation in seed’s reserves and phytohormone levels.

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Section: Methodsmentioning

confidence: 99%

The Impact of Fruit Etiolation on Quality of Seeds in Tobacco

et al. 2020

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“…More than 80% of Cd and Pb total content was accumulated in the roots and tubers. Similarly, the accumulation of a high concentration of toxic metals in the roots system of orchid Epipactis atrorubens, growing on abandoned mining sites in Italy with a high content of metals, has already been described [14]. Also, within the assessment of the metals bioavailability and its translocation, while calculating absorption coeffi cients and bioconcentration and translocation factors (Table 5), the presence of accu-mulation in underground organs was noticed, for all three toxic metals, as well as arsenic transportation to the above-ground orchid organs; between 18.17 -26.49% of total arsenic was transferred to leaves, showing no signifi cant difference among soils developed on different bedrocks (Table 4).…”

Section: Resultsmentioning

confidence: 83%

“…Two of the most commonly used protocols in this regard are the BCR extraction procedure (Community Bureau of Reference) and the procedure proposed by Tessier et al (1979) [13]. According to the De Agostini, [14] rare plants, such as orchids, may occur in modifi ed habitats and on soils containing heavy metals, yet their ecological and physiological responses to heavy metals are still poorly understood. Some orchids, such as Epipactis atrorubens, have the ability to adapt to nutrient-poor and dry substrates on different bedrock types, as stated by Filimonova et al (2019) [15].…”

Section: Introductionmentioning

confidence: 99%

Orchid species Anacamptis morio as a potential bioremediator of As, Cd and Pb

Mikavica¹,

Ranđelović²,

Djordjević³

et al. 2020

J Appl Eng Science

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In this study concentration of toxic elements As, Cd, and Pb were determined in different soil types and belonging orchid species Anacamptis morio vital parts, in order to examine accumulation patterns and provide new insights about the potential use of this orchid in bioremediation technology. Soils developed on limestone, serpentine, and the chert were subjected to the BCR sequential extraction. Samples of orchid roots and tubers, as underground parts, and stems, leaves, and infl orescences, as above-ground organs, were also analyzed for the content of As, Cd and Pb. During this research, it was observed that metal content in soil is directly proportional to its content in the plant, more specifi cally in roots, which suggests that A. morio can potentially be used in the phytostabilization of contaminated sites. Values for BCF factors showed Cd immobilization in roots regardless of the soil type. A certain level of arsenic was transferred from roots to leaves indicating the potential for accumulation of this element into aboveground organs. Assessment of the phytoremediation potential of this orchid or another plant species from diverse environments is important as it provides information about the possibility of their future application in environmental remediation programs.

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“…Changing natural habitats have caused the extinction of many orchid species [17]. However, some orchids, especially in temperate regions of Europe and North America, have been found in anthropogenically disturbed territories, such as industrial dumps formed after the excavation and extraction of coal, iron, and some trace elements, and the fly ash dumps of thermal power plants [13,14,[18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Morphophysiological Features of Neottia ovata (Orchidaceae) Contributing to Its Natural Colonization on Fly Ash Deposits

et al. 2021

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In previous decades, some species of the Orchidaceae family have been found growing in man-made habitats. Neottia ovata is one of the most widespread orchids in Europe, however it is quite rare in Russia and is included in several regional Red Data Books. The purpose of this study was to compare the chemical composition and morphophysiological parameters of N. ovata from two forest communities of the Middle Urals, Russia: natural and transformed (fly ash dump of Verkhnetagil’skaya Thermal Power Station) for determining orchid adaptive features. The content of most of the studied metals in the underground parts (rhizome + roots) of N. ovata was considerably higher than in the leaves, which diminished the harmful effect of toxic metals on the aboveground organs. The adaptive changes in the leaf mesostructure of N. ovata such as an increase in epidermis thickness, the number of chloroplasts in the cell, and the internal assimilating surface were found for the first time. The orchids from the fly ash deposits were characterized by a higher content of chlorophyll b and carotenoids than plants from the natural forest community that evidenced the compensatory response on the decrease in chlorophyll a. The ability of N. ovata from the transformed habitat to maintain a relatively favorable water balance and stable assimilation indexes further contribute to its high viability. The study of orchid adaptive responses to unfavorable factors is necessary for their successful naturalization and introduction into a new environment.

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Heavy metal tolerance of orchid populations growing on abandoned mine tailings: A case study in Sardinia Island (Italy)

Cited by 55 publications

References 47 publications

The Impact of Fruit Etiolation on Quality of Seeds in Tobacco

The Impact of Fruit Etiolation on Quality of Seeds in Tobacco

Orchid species Anacamptis morio as a potential bioremediator of As, Cd and Pb

Adaptive Morphophysiological Features of Neottia ovata (Orchidaceae) Contributing to Its Natural Colonization on Fly Ash Deposits

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