Journal ArticleDOI
Effect of silicate on the growth and arsenate uptake by rice (Oryza sativa L.) seedlings in solution culture
TLDR
Weiyou et al. as discussed by the authors investigated the effect of silicate on the yield and arsenate uptake by rice seedlings, and showed that adding Si to the growth medium also inhibited the uptake of arsenate and phosphate by the seedlings.Abstract:
A solution culture experiment was conducted to investigate the effect of silicate on the yield and arsenate uptake by rice. Rice seedlings (Oryza sativaL. cv. Weiyou 77) were cultured in modified Hoagland nutrient solution containing three arsenate levels (0, 0.5 and 1.0 mg L −1 As) and four silicate levels (0, 14, 28 and 56 mg L −1 Si). Addition of Si significantly increased shoot dry weight (P=0.001) but had little effect on root dry weight (P=0.43). Addition of As had no significant effect on shoot dry weight (P=0.43) but significantly increased root dry weight (P=0.01). Silicon concentrations in shoots and roots increased proportionally to increasing amounts of externally supplied Si (P< 0.001). The presence of As in the nutrient solution had little effect on shoot Si concentration (P=0.16) but significantly decreased root Si concentration (P=0.005). Increasing external Si concentration significantly decreased shoot and root As concentrations and total As uptake by rice seedlings (P <0.001). In addition, Si significantly decreased shoot P concentration and shoot P uptake (P <0.001). The data clearly demonstrate a beneficial effect of Si on the growth of rice seedlings. Addition of Si to the growth medium also inhibited the uptake of arsenate and phosphate by the rice seedlings.read more
Citations
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Journal ArticleDOI
Arsenic uptake and metabolism in plants.
TL;DR: Hyperaccumulation appears to involve enhanced arsenate uptake, decreased arsenite-thiol complexation and arsenite efflux to the external medium, greatly enhanced xylem translocation of arsenite, and vacuolar sequestration of arsenites in fronds.
Journal ArticleDOI
Mechanisms of silicon-mediated alleviation of abiotic stresses in higher plants: a review.
TL;DR: The key mechanisms of Si-mediated alleviation of abiotic stresses in higher plants include: stimulation of antioxidant systems in plants, complexation or co-precipitation of toxic metal ions with Si, immobilization of toxicMetal ions in growth media, uptake processes, and compartmentation of metal ions within plants.
Journal ArticleDOI
Mechanisms of silicon-mediated alleviation of heavy metal toxicity in plants: A review
Muhammad Adrees,Shafaqat Ali,Muhammad Rizwan,Muhammad Zia-ur-Rehman,Muhammad Ibrahim,Farhat Abbas,Mujahid Farid,Muhammad Farooq Qayyum,Muhammad Irshad +8 more
TL;DR: The mechanisms through which Si can alleviate heavy metal toxicity in plants are reviewed and the key mechanisms evoked include reducing active heavy metal ions in growth media, reduced metal uptake and root-to-shoot translocation, chelation and stimulation of antioxidant systems in plants.
Journal ArticleDOI
Silicon-mediated changes of some physiological and enzymatic parameters symptomatic for oxidative stress in spinach and tomato grown in sodic-B toxic soil
TL;DR: In this article, the effect of silicon (Si) on the growth, uptake of sodium (Na), chloride (Cl), boron (B), stomatal resistance (SR), lipid peroxidation (MDA), membrane permeability (MP), lipoxygenase (LOX) activity, proline (PRO) accumulation, H2O2 accumulation, nonenzymatic antioxidant activity (AA) and the activities of major antioxidant enzymes (superoxide dismutase, SOD; catalase, CAT and ascorbate peroxidase, AP
Journal ArticleDOI
Consistent alleviation of abiotic stress with silicon addition: a meta-analysis.
TL;DR: It is demonstrated that across plant families and stress types, Si increases dry weight, assimilation rate and chlorophyll biosynthesis and alleviates oxidative damage in stressed plants, and Meta-analyses showed consistent alleviation by Si of oxidative damage caused by a range of abiotic stresses across diverse species.
References
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Journal ArticleDOI
Arsenic round the world: a review.
TL;DR: This review deals with environmental origin, occurrence, episodes, and impact on human health of arsenic, a metalloid occurs naturally, being the 20th most abundant element in the earth's crust.
Journal ArticleDOI
The anomaly of silicon in plant biology.
TL;DR: Ample evidence is presented that silicon, when readily available to plants, plays a large role in their growth, mineral nutrition, mechanical strength, and resistance to fungal diseases, herbivory, and adverse chemical conditions of the medium.
Journal ArticleDOI
Suppression of the High Affinity Phosphate Uptake System: A Mechanism of Arsenate Tolerance in Holcus lanatus L.
Andrew A. Meharg,Mark R. Macnair +1 more
Journal Article
Groundwater arsenic calamity in Bangladesh
R.K. Dhar,Bhajan Kumar Biswas,Gautum Samanta,Badal Kumar Mandal,Dipankar Chakraborti,Shibtosh Roy,Abu Jafar,Ariful Islam,Gulshan Ara,Saiful Kabir,A. Wadud Khan,S Akther Ahmed,S Abdul Hadi +12 more
Journal ArticleDOI
Evaluation of arsenate- and vanadate-associated changes of electrical membrane potential and phosphate transport in Lemna gibba G1
TL;DR: Arsenate proved to be competitive with the highand low-affinity phosphate uptake system and induced transient membrane potential changes of up to 120 mV which were similar to those induced by phosphate and indicated a cotransport mechanism with at least 2H+/H2As04.