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Silicon Uptake and Effects in Plants
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Silicon Uptake and Effects in Plants

A special issue of Plants (ISSN 2223-7747).

Deadline for manuscript submissions: closed (30 April 2020) | Viewed by 12567

Special Issue Editors

Dr. Harmanjit Kaur

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Guest Editor
Department of Ecology Environment and Plant Sciences, Stockholm University, 114 19 Stockholm, Sweden
Interests: silicon and silicon nanoparticle uptake and transport studies; silicon influence on heavy metal uptake in plants; Si transport activity mediated by transporter genes
Dr. Maria Greger

E-Mail Website
Guest Editor
Stockholm University (SU), Department of Ecology, Environment, and Plants Sciences, 106 91 Stockholm, Sweden
Interests: phytoremediation; soil; water; silicon, contaminant, abiotic, biotic, stress, heavy metals
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Silicon holds a unique position in plant biology due to its vital contribution towards plant growth and development. However, its essentiality towards plants is always a debated issue, as most plants can complete their normal life cycle without supplementation of Si into the soil. Although it is the second most abundant element, the unavailability of the free silicon form and entrapment in recalcitrant silicate minerals restricts its availability to plants. More recently, it has been observed that the application of chemical fertilizers has depleted the normal Si availability in the soil. All these findings bring a resurgence of interest in studying the nutrient role of silicon as a beneficial element and to study the underlying mechanism involved in the uptake, transport, and status of its availability to plants. Silicon is mainly taken up in the undissociated silicic acid form, and is translocated in the same form through the xylem. During the process of translocation, it gets chemically mineralized to form silica aggregates (i.e., phytoliths) which resemble Si nanoparticles. In recent years, several studies have led to the conclusion that various influx and efflux transporters are involved in the process of silicon uptake and translocation. Therefore, in this Special Issue we will highlight the role of various mechanisms involved in silicon uptake and transport using transporters. We will also highlight the essentiality of Si in plants and focus on the heterogeneity of Si effects on uptake, distribution, and effects on the uptake of various forms of Si.

This Special Issue will cover any review, mini-review, and research article on topics related to the following sub-topics:

  • Silicon uptake and transport in higher plants;
  • Role of silicon in abiotic stresses;
  • Role of transporters in silicon uptake;
  • Effect of silicon on the uptake of other elements;
  • Effect of silicon on the uptake of heavy metals;
  • Uptake of various silica forms.

Dr. Harmanjit Kaur
Dr. Maria Greger
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Plants is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • silicon
  • silicon effects
  • silicon transporters
  • silicon uptake
  • phytoliths

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Published Papers (2 papers)

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Research

15 pages, 2112 KiB  
Article
Silicon Foliar Application Mitigates Salt Stress in Sweet Pepper Plants by Enhancing Water Status, Photosynthesis, Antioxidant Enzyme Activity and Fruit Yield
by Khaled A. A. Abdelaal, Yasser S.A. Mazrou and Yaser M. Hafez
Plants 2020, 9(6), 733; https://doi.org/10.3390/plants9060733 - 10 Jun 2020
Cited by 171 | Viewed by 9051
Abstract
Silicon is one of the most significant elements in plants under abiotic stress, so we investigated the role of silicon in alleviation of the detrimental effects of salinity at two concentrations (1500 and 3000 ppm sodium chloride) in sweet pepper plants in two [...] Read more.
Silicon is one of the most significant elements in plants under abiotic stress, so we investigated the role of silicon in alleviation of the detrimental effects of salinity at two concentrations (1500 and 3000 ppm sodium chloride) in sweet pepper plants in two seasons (2018 and 2019). Our results indicated that relative water content, concentrations of chlorophyll a and b, nitrogen, phosphorus and potassium contents, number of fruits plant−1, fruit fresh weight plant−1 (g) and fruit yield (ton hectare−1) significantly decreased in salt-stressed sweet pepper plants as compared to control plants. In addition, electrolyte leakage, proline, lipid peroxidation, superoxide (O2−) and hydrogen peroxide (H2O2) levels, soluble sugars, sucrose, and starch content as well as sodium content significantly increased under salinity conditions. Conversely, foliar application of silicon led to improvements in concentrations of chlorophyll a and b and mineral nutrients, water status, and fruit yield of sweet pepper plants. Furthermore, lipid peroxidation, electrolyte leakage, levels of superoxide, and hydrogen peroxide were decreased with silicon treatments. Full article
(This article belongs to the Special Issue Silicon Uptake and Effects in Plants)
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11 pages, 2859 KiB  
Article
Putative Silicon Transporters and Effect of Temperature Stresses and Silicon Supplementation on Their Expressions and Tissue Silicon Content in Poinsettia
by Jiangtao Hu, Yali Li and Byoung Ryong Jeong
Plants 2020, 9(5), 569; https://doi.org/10.3390/plants9050569 - 29 Apr 2020
Cited by 10 | Viewed by 2608
Abstract
Silicon (Si) is a beneficial element for plants. To understand Si uptake and accumulation in poinsettia, the Si transporters and their expression patterns were investigated. Nodulin 26-like intrinsic membrane proteins (NIPs) act as transporters of water and small solutes, including silicic acid. In [...] Read more.
Silicon (Si) is a beneficial element for plants. To understand Si uptake and accumulation in poinsettia, the Si transporters and their expression patterns were investigated. Nodulin 26-like intrinsic membrane proteins (NIPs) act as transporters of water and small solutes, including silicic acid. In this study, one NIP member, designated EpLsi1, was identified. Additionally, a protein from the citrate transporter family, designated EpLsi2, was identified. Sequence analyses indicated that EpLsi1 belonged to the NIP-I subgroup, which has a low Si uptake capacity. Consistently, the measured tissue Si content in the poinsettia was less than 1.73 ± 0.17 mg·g−1 dry weight, which was very low when compared to that in high Si accumulators. The expressions of EpLsi1 and EpLsi2 in poinsettia cuttings treated with 0 mg·L−1 Si decreased under temperature stresses. A short-term Si supplementation decreased the expressions of both EpLsi1 and EpLsi2 in the roots and leaves, while a long-term Si supplementation increased the expression of EpLsi1 in the leaves, bracts, and cyathia, and increased the expression of EpLsi2 in the roots and leaves. Tissue Si content increased in the roots of cuttings treated with 75 mg·L−1 Si at both 4 and 40 °C, indicating that the transport activities of the EpLsi1 were enhanced under temperature stresses. A long-term Si supplementation increased the tissue Si content in the roots of poinsettia treated with 75 mg·L−1 Si. Overall, poinsettia was a low Si accumulator, the expressions of Si transporters were down-regulated, and the tissue Si content increased with temperature stresses and Si supplementation. These results may help the breeding and commercial production of poinsettia. Full article
(This article belongs to the Special Issue Silicon Uptake and Effects in Plants)
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