Vein Loading in Seedlings of <i>Phaseolus vulgaris</i> Exposed to Excess Cobalt, Nickel, and Zinc

Rauser, Wilfried E.; Samarakoon, Ananda B.

doi:10.1104/pp.65.4.578

Cited by 56 publications

(27 citation statements)

References 5 publications

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“…Such findings are similar to those reported for Spirodela polyrhiza (Appenroth et al, 2003). According to Rauser and Samarakon (1980), Cr reduces carbohydrate flow in the phloem, an effect that may be mediated by the inhibition of transport of sucrose from the inside to the outside of the chloroplast envelope. Poschenrider et al (1991) suggested that this phenomenon might be associated with an increase of 11010-p.2 ICHMET 2012 biologically active iron in solution.…”

Section: Resultssupporting

confidence: 89%

Ultrastructural damage in tomato plants exposed to chromium III

Mangabeira

Almeida

Souza

et al. 2013

E3S Web of Conferences

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Abstract. The study aimed to investigate the short-term effects of Cr on the ultrastructure of root, stem and leaf cells of tomato plants (Solanum lycopersicum L.), and to verify the compartmentalization of the transition metal. Tomato seedlings were grown in an environmental chamber maintained at 25 ±1°C, with relative humidity of 70% and a 12 h photoperiod, in full-strength nutrient solution containing 25 or 50 mg L -1 of Cr(III), while control plants were cultured in the absence of Cr. An electron probe X-ray microanalyzer equipped with a wavelength dispersive spectrometer was used in association with transmission electron microscopy in order to localize Cr deposits. In tomato roots Cr deposits were concentrated mainly in the cell walls, while in stems and leaves the deposits could be observed in the cells walls as well as in vacuoles, suggesting that these compartments act as barriers against metal phytotoxicity. Plants exposed to Cr presented leaves containing abnormally shaped chloroplasts, with reduced numbers of grana and atypical thylakoids, whereas the mitochondria presented reduced numbers of cristae. These Cr-induced alterations result in the diminution of photosynthetic and respiratory activities with harmful consequences to plant health. The microanalytical methods employed in this study have shed new light onto the possible causes of Cr phytotoxicity. Such knowledge is valuable in understanding the mechanisms employed by plants to circumvent the uptake and transport of potentially toxic metals.

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Section: Resultssupporting

confidence: 89%

Ultrastructural damage in tomato plants exposed to chromium III

Mangabeira

Almeida

Souza

et al. 2013

E3S Web of Conferences

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“…However, the effects of Cd on chloroplast structure differ from those induced by other heavy metals. Heavy metals were shown to induce starch accumulation, probably by inhibition of vein loading [48][49][50]. In the present study, the absence of starch accumulation in chloroplast stroma may be explained by the inhibition of photosynthesis by Cd [51][52][53].…”

Section: Discussionmentioning

confidence: 62%

Ultrastructural and Photosynthetic Response of Populus 107 Leaves to Cadmium Stress

Ge¹,

Jiao²,

Jiang³

et al. 2015

Pol. J. Environ. Stud.

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“…The densitometric method for quantifying the contrast between mesophyll and veins (Rauser and Samarkoon 1980) was not appropriate for the highest-order veins: the background labelling (radioactivity in the mesophyll) turned out to be too high. Instead, we developed a by-eye estimation procedure which was carried out independently by three persons.…”

Section: Discussionmentioning

confidence: 97%

Dissimilar phloem loading in leaves with symplasmic or apoplasmic minor-vein configurations

Bel

Gamalei

Ammerlaan

et al. 1992

Planta

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Plant species were selected on the basis of abundant or no symplasmic continuity between sieveelement-companion-cell (SE-CC) complexes and adjacent cells in the minor veins. Symplasmic continuity and discontinuity are denoted, respectively, as symplasmic and apoplasmic minor-vein configurations. Discs of predarkened leaves from which the lower epidermis had been removed, were exposed to (14)CO2. After 2 h of subsequent incubation, phloem loading in control discs and discs treated with p-chloromercuribenzenesulfonic acid (PCMBS) was recorded by autoradiography. Phloem loading was strongly suppressed by PCMBS in minor veins with symplasmically isolated SE-CC complexes (Centaurea, Impatiens, Ligularia, Pelargonium, Pisum, Symphytum). No significant inhibition of phloem loading by PCMBS was observed in minor veins containing sieve elements with abundant symplasmic connections (Epilobium, Fuchsia, Hydrangea, Oenothera, Origanum, Stachys). Phloem loading in minor veins with both types of SE-CC complex (Acanthus) had apoplasmic features. The results provide strong evidence for coincidence between the mode of phloem loading and the minor-vein configuration. The widespread occurrence of a symplasmic mode of phloem loading is postulated.

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Vein Loading in Seedlings of Phaseolus vulgaris Exposed to Excess Cobalt, Nickel, and Zinc

Cited by 56 publications

References 5 publications

Ultrastructural damage in tomato plants exposed to chromium III

Ultrastructural damage in tomato plants exposed to chromium III

Ultrastructural and Photosynthetic Response of Populus 107 Leaves to Cadmium Stress

Dissimilar phloem loading in leaves with symplasmic or apoplasmic minor-vein configurations

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