Growth inhibition by selenium is associated with changes in primary metabolism and nutrient levels in <i>Arabidopsis thaliana</i>

Ribeiro, Dimas M.; Júnior, Dalton D. Silva; Cardoso, Flávio Barcellos; Martins, Auxiliadora Oliveira; Silva, Welder A.; Nascimento, Vitor L.; Araújo, Wagner L.

doi:10.1111/pce.12783

Cited by 42 publications

(16 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Evidence that soluble sugars can be reduced has also been found. Ribeiro et al (2016) observed lower starch degradation at nightfall in Arabidopsis thaliana under increased Se conditions, as well as a reduction in the concentration of saccharides and hexoses in the same period.…”

Section: Photoassimilates and Photosynthetic Pigmentsmentioning

confidence: 68%

Physiological, biochemical, and ultrastructural characterization of selenium toxicity in cowpea plants

Silva

Boleta

Lanza

et al. 2018

Environmental and Experimental Botany

100

View full text Add to dashboard Cite

Selenium (Se) is considered a beneficial element for plants; however, in high concentrations, it causes negative effects on plant physiology and development. This study reports the first physiological, nutritional, and ultrastructural description of Se toxicity in cowpea growing under field conditions. Selenium was supplied as a foliar application of sodium selenite at varying concentrations (0, 50, 100, 200, 400, 800, 1200, and 1600 g ha −1). An increased yield was observed with the application of 50 g ha −1 Se. Application of concentrations higher than 50 g ha −1 caused leaf toxicity. Increased lipid peroxidation and hydrogen peroxide concentration and reduced total sugars, sucrose, and carotenoid concentration were observed at highest doses tested (1200 and 1600 g ha −1). Applications of more than 50 g ha −1 Se reduced the phloem diameter, caused chlorosis of the leaf blade with a coalescence of lesions, and caused pink salt deposits to appear. Lesions were observed mainly near the trichomes on the adaxial surface of the leaf blade. An analysis of the element distribution with microprobe Xray fluorescence spectrometry (μ-XRF) revealed accumulation of Se, calcium (Ca), potassium (K), copper (Cu), and manganese (Mn) near the primary vein and in the necrotic brown areas of the leaf lesions. In contrast, Na was homogeneously distributed in the leaf tissue.

show abstract

Section: Photoassimilates and Photosynthetic Pigmentsmentioning

confidence: 68%

Physiological, biochemical, and ultrastructural characterization of selenium toxicity in cowpea plants

Silva

Boleta

Lanza

et al. 2018

Environmental and Experimental Botany

100

View full text Add to dashboard Cite

show abstract

“…Selenium increases the activity of amylases and invertases in mungbean, and application of Se could increase the soluble sugar concentration in the leaves of cowpea . On the other hand, evidence that soluble sugars can be reduced by Se has also been observed, due a lower starch degradation at nightfall in Arabidopsis thaliana under increased Se conditions, indicating that Se might inhibit starch degradation …”

Section: Discussionmentioning

confidence: 99%

“…29 On the other hand, evidence that soluble sugars can be reduced by Se has also been observed, due a lower starch degradation at nightfall in Arabidopsis thaliana under increased Se conditions, indicating that Se might inhibit starch degradation. 42 Furthermore, the concentrations in seeds of most elements to which PA might bind were unaffected by the application of selenate or selenite (Appendices F and G). Thus, Se biofortification of cowpea seeds would not appear to impact negatively on the bioavailability of other human and animal nutrients.…”

Section: Discussionmentioning

confidence: 99%

Agronomic biofortification of cowpea with selenium: effects of selenate and selenite applications on selenium and phytate concentrations in seeds

et al. 2019

View full text Add to dashboard Cite

BACKGROUND Selenium (Se) is a nutrient for animals and humans, and is considered beneficial to higher plants. Selenium concentrations are low in most soils, which can result in a lack of Se in plants, and consequently in human diets. Phytic acid (PA) is the main storage form of phosphorus in seeds, and it is able to form insoluble complexes with essential minerals in the monogastric gut. This study aimed to establish optimal levels of Se application to cowpea, with the aim of increasing Se concentrations. The efficiency of agronomic biofortification was evaluated by the application of seven levels of Se (0, 2.5, 5, 10, 20, 40, and 60 g ha−1) from two sources (selenate and selenite) to the soil under field conditions in 2016 and 2017. RESULTS Application of Se as selenate led to greater plant Se concentrations than application as selenite in both leaves and grains. Assuming human cowpea consumption of 54.2 g day−1, Se application of 20 g ha−1 in 2016 or 10 g ha−1 in 2017 as selenate would have provided a suitable daily intake of Se (between 20 and 55 μg day−1) for humans. Phytic acid showed no direct response to Se application. CONCLUSION Selenate provides greater phytoavailability than selenite. The application of 10 g Se ha−1 of selenate to cowpea plants could provide sufficient seed Se to increase daily human intake by 13–14 μg d−1. © 2019 Society of Chemical Industry

show abstract

“…9 The primary metabolism and the levels of some essential macro-and microelements are also affected by Se and these changes are associated with selenium-induced growth inhibition. 18,20 CONTACT Zsuzsanna Kolbert kolzsu@bio.u-szeged.hu.…”

Section: Known Molecular Mechanisms Of Selenium Toxicitymentioning

confidence: 99%

“The roots” of selenium toxicity: A new concept

Kolbert

Lehotai

Molnár

et al. 2016

Plant Signaling & Behavior

View full text Add to dashboard Cite

Elevated levels of selenium (Se) cause toxicity in non-accumulator plant species. The primary reasons for toxic Se effect have been considered to be selenoprotein accumulation and oxidative stress. However, based on our recent paper in Plant Cell Reports and previous literature data we suggest that disturbances in the homeostasis of both reactive oxygen and nitrogen species result in selenium-induced nitro-oxidative stress, contributing to toxicity. The most characteristic symptom of Se exposure is the inhibited root elongation which is partly caused by hormonal disturbances. Our recent paper suggests the involvement of cytokinin in selenium stress sensing of the root systemAltogether, the aim of this Addendum is to present reactive nitrogen species and phytohormones as new players in plant selenium toxicity.

show abstract

Growth inhibition by selenium is associated with changes in primary metabolism and nutrient levels in Arabidopsis thaliana

Cited by 42 publications

References 59 publications

Physiological, biochemical, and ultrastructural characterization of selenium toxicity in cowpea plants

Physiological, biochemical, and ultrastructural characterization of selenium toxicity in cowpea plants

Agronomic biofortification of cowpea with selenium: effects of selenate and selenite applications on selenium and phytate concentrations in seeds

“The roots” of selenium toxicity: A new concept

Contact Info

Product

Resources

About