Anatomical element localization by EDXS in Grevillea exul var. exul under nickel stress

Rabier, Jacques; Laffont-Schwob, Isabelle; Notonier, Roger; Fogliani, Bruno; Bouraïma-Madjèbi, Saliou

doi:10.1016/j.envpol.2008.04.001

Cited by 16 publications

(4 citation statements)

References 39 publications

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“…Nickel increased the Si content of Grevillea exul var. Exul roots, and this was noted especially in the rhizodermis, where the concentration of Ni was lowest (Rabier et al 2008; Table 1). Similarly, the localization of Si in the roots reported here was mainly in the rhizodermis, and was thus opposite to Cr.…”

Section: Discussionmentioning

confidence: 91%

Ultrastructure and subcellular distribution of Cr in Iris pseudacorus L. using TEM and X-ray microanalysis

2011

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Chromium pollution of freshwater is hazardous for humans and other organisms, and places a limitation on the use of polluted water sources. Phytoremediation, the use of plants to remove pollutants from the environment, is a cost-effective, environmentally friendly approach for water decontamination. To improve the efficiency of the process, it is essential to increase the current knowledge about Cr accumulation in macrophytes. Plants of Iris pseudacorus L. were treated with Cr(III) at 0.75 mM for 5 weeks to investigate Cr localization by means of transmission electron microscopy and energy dispersive X-ray analysis. Chromium induced severe ultrastructural alterations in the rhizodermis (cell wall disorganisation, thickening, plasmolysis, and electron-dense inclusions) and rhizome parenchyma (reduced cell size, cell wall detachment, vacuolation, and opaque granules). The highest Cr contents were found in the cell walls of the cortex in the roots and in the cytoplasm and intercellular spaces of the rhizome. The Cr concentration in root tissues was in the order cortex>rhizodermis>stele, whereas in the rhizome, Cr was evenly distributed. It is proposed that root and rhizome have distinct functions in the response of I. pseudacorus to Cr. The rhizodermis limits Cr uptake by means of Si deposition and cell wall thickening. The rhizome cortex generates vacuoles and granules where Cr co-occurs with S, indicating Cr sequestration by metal-binding proteins.

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Section: Discussionmentioning

confidence: 91%

Ultrastructure and subcellular distribution of Cr in Iris pseudacorus L. using TEM and X-ray microanalysis

2011

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“…The length and width of entire DWFP, as well as those that had been cut transversally or longitudinally, were measured using a dissecting microscope equipped with a micrometer. DWFP were mounted on scanning electron microscope specimen holders using double-sided carbon adhesive tape and carbon-metalized (10-15 nm), as described by Rabier et al (2008). Observations and size measurements were made using a Philips XL 30 environmental scanning electron microscope.…”

Section: Physical Characteristics Of Mature Dwfp and Seedsmentioning

confidence: 99%

The morphophysiological dormancy inAmborella trichopodaseeds is a pleisiomorphic trait in angiosperms

Fogliani¹,

Gâteblé²,

Villegente³

et al. 2017

Ann Bot

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Background and Aims Recent parsimony-based reconstructions suggest that seeds of early angiosperms had either morphophysiological or physiological dormancy, with the former considered as more probable. The aim of this study was to determine the class of seed dormancy present in Amborella trichopoda, the sole living representative of the most basal angiosperm lineage Amborellales, with a view to resolving fully the class of dormancy present at the base of the angiosperm clade.Methods Drupes of A. trichopoda without fleshy parts were germinated and dissected to observe their structure and embryo growth. Pre-treatments including acid scarification, gibberellin treatment and seed excision were tested to determine their influence on dormancy breakage and germination. Character-state mapping by maximum parsimony, incorporating data from the present work and published sources, was then used to determine the likely class of dormancy present in early angiosperms.Key Results Germination in A. trichopoda requires a warm stratification period of at least approx. 90 d, which is followed by endosperm swelling, causing the water-permeable pericarp-mesocarp envelope to split open. The embryo then grows rapidly within the seed, to radicle emergence some 17 d later and cotyledon emergence after an additional 24 d. Gibberellin treatment, acid scarification and excision of seeds from the surrounding drupe tissues all promoted germination by shortening the initial phase of dormancy, prior to embryo growth.Conclusions Seeds of A. trichopoda have non-deep simple morphophysiological dormancy, in which mechanical resistance of the pericarp-mesocarp envelope plays a key role in the initial physiological phase. Maximum parsimony analyses, including data obtained in the present work, indicate that morphophysiological dormancy is likely to be a pleisiomorphic trait in flowering plants. The significance of this conclusion for studies of early angiosperm evolution is discussed.

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“…Although there are extensive investigations about the performance of hyperaccumulating plants of heavy metals; the main focus of this study is the determination of their concentrations and distribution among stems and leaves, and their distribution in specific tissues (Figs. A2 and D3) (Rabier et al, ; Vollenweider et al, a).…”

Section: Discussionmentioning

confidence: 99%

“Microscopic evidences of heavy metals distribution and anatomic alterations in breaching-leaves of Cupressuslindleyigrowing around mining wastes”

Gómez-Bernal

Mortón-Bermea

Aurora

et al. 2014

Microsc. Res. Tech.

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In this article a study of the distribution of heavy metals in Cupressus lindleyi breaching-leaves was done in Taxco, Guerrero. At the same, heavy metals micro-localization was conducted in the breaching-leaves to understand the structural changes provoked by mining waste on plants. The most abundant contaminants in soils, tailings and different plant organs (roots, stems, and leaves) were Zn, Mn, and Pb. Nevertheless, As was more accumulated in the stem and breaching-leaves. The translocation factor and the bio-concentration factor were less than 1. The structural changes observed were the great accumulation of starch grains and phenolic compounds in the palisade parenchyma, changes in the hypodermis cell wall and necrotic zones in the palisade parenchyma. The distribution of heavy metals in breaching-leaves tissues was homogeneous in most of the elements. These results showed that C. lindleyi is a species that can be employed in phytostabilization of contaminated zones with mining waste because it is a native plant that does not require a lot of conditions for its development.

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Anatomical element localization by EDXS in Grevillea exul var. exul under nickel stress

Cited by 16 publications

References 39 publications

Ultrastructure and subcellular distribution of Cr in Iris pseudacorus L. using TEM and X-ray microanalysis

Ultrastructure and subcellular distribution of Cr in Iris pseudacorus L. using TEM and X-ray microanalysis

The morphophysiological dormancy inAmborella trichopodaseeds is a pleisiomorphic trait in angiosperms

“Microscopic evidences of heavy metals distribution and anatomic alterations in breaching-leaves of Cupressuslindleyigrowing around mining wastes”

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