Special Issue "Novel Insights into the Genetics of Root Development (2019)"

A special issue of Genes (ISSN 2073-4425). This special issue belongs to the section "Plant Genetics and Genomics".

Deadline for manuscript submissions: 20 September 2019.

Special Issue Editor

Guest Editor
Dr. Marc Libault

Department of Agronomy and Horticulture Center for Plant Science Innovation Center for Root & Rhizobiome Innovation, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
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Special Issue Information

Dear Colleagues,

Due to its basal function (i.e., uptake of water and nutrient from the soil), the root system is playing a critical role in plant growth and yield. Its constant adaptation to various environmental stresses including abiotic and biotic stresses (e.g., interaction between the plant root system and the soil microbiome), its simple cellular organization, and its well-described architecture are clear advantage when applying molecular genetic approaches to better understand its development and its response to environmental stresses.

In this Special Issue, we are inviting reviews, perspectives, and original research articles to advance our knowledge related to plant root development. Topics will include, but not limited to the development of new methods and technologies to analyze root architecture, genome-wide association studies focusing on root phenotypic traits, the characterization of the regulatory mechanisms controlling gene activity during root development notably in response to biotic and abiotic stresses (e.g., role of miRNA, DNA methylation and other epigenomic changes, functional genomic studies revealing the role of genes and proteins during root development).  This Special Issue will also consider manuscripts describing the development of unique plant organs such as legume nodules.

Dr. Marc Libault
Guest Editor

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 papers will be 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. Genes is an international peer-reviewed open access monthly 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 1800 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

  • root
  • development
  • biotic stress
  • abiotic stress
  • genomics.

Published Papers (2 papers)

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Research

Open AccessArticle
Overexpression of Nitrate Transporter OsNRT2.1 Enhances Nitrate-Dependent Root Elongation
Received: 18 February 2019 / Revised: 2 April 2019 / Accepted: 3 April 2019 / Published: 9 April 2019
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Abstract
Root morphology is essential for plant survival. NO3 is not only a nutrient, but also a signal substance affecting root growth in plants. However, the mechanism of NO3-mediated root growth in rice remains unclear. In this study, we [...] Read more.
Root morphology is essential for plant survival. NO3 is not only a nutrient, but also a signal substance affecting root growth in plants. However, the mechanism of NO3-mediated root growth in rice remains unclear. In this study, we investigated the effect of OsNRT2.1 on root elongation and nitrate signaling-mediated auxin transport using OsNRT2.1 overexpression lines. We observed that the overexpression of OsNRT2.1 increased the total root length in rice, including the seminal root length, total adventitious root length, and total lateral root length in seminal roots and adventitious roots under 0.5-mM NO3 conditions, but not under 0.5-mM NH4+ conditions. Compared with wild type (WT), the 15NO3 influx rate of OsNRT2.1 transgenic lines increased by 24.3%, and the expressions of auxin transporter genes (OsPIN1a/b/c and OsPIN2) also increased significantly under 0.5-mM NO3 conditions. There were no significant differences in root length, ß-glucuronidase (GUS) activity, and the expressions of OsPIN1a/b/c and OsPIN2 in the pDR5::GUS transgenic line between 0.5-mM NO3 and 0.5-mM NH4+ treatments together with N-1-naphthylphalamic acid (NPA) treatment. When exogenous NPA was added to 0.5-mM NO3 nutrient solution, there were no significant differences in the total root length and expressions of OsPIN1a/b/c and OsPIN2 between transgenic plants and WT, although the 15NO3 influx rate of OsNRT2.1 transgenic lines increased by 25.2%. These results indicated that OsNRT2.1 is involved in the pathway of nitrate-dependent root elongation by regulating auxin transport to roots; i.e., overexpressing OsNRT2.1 promotes an effect on root growth upon NO3 treatment that requires active polar auxin transport. Full article
(This article belongs to the Special Issue Novel Insights into the Genetics of Root Development (2019))
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Open AccessArticle
RNA-Seq Transcriptome Analysis of Rice Primary Roots Reveals the Role of Flavonoids in Regulating the Rice Primary Root Growth
Received: 24 January 2019 / Revised: 6 March 2019 / Accepted: 7 March 2019 / Published: 13 March 2019
PDF Full-text (4551 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Flavonoids play important roles in root development and in its tropic responses, whereas the flavonoids-mediated changes of the global transcription levels during root growth remain unclear. Here, the global transcription changes in quercetin-treated rice primary roots were analyzed. Quercetin treatment significantly induced the [...] Read more.
Flavonoids play important roles in root development and in its tropic responses, whereas the flavonoids-mediated changes of the global transcription levels during root growth remain unclear. Here, the global transcription changes in quercetin-treated rice primary roots were analyzed. Quercetin treatment significantly induced the inhibition of root growth and the reduction of H2O2 and O2 levels. In addition, the RNA-seq analysis revealed that there are 1243 differentially expressed genes (DEGs) identified in quercetin-treated roots, including 1032 up-regulated and 211 down-regulated genes. A gene ontology (GO) enrichment analysis showed that the enriched GO terms are mainly associated with the cell wall organization, response to oxidative stress, and response to hormone stimulus. The Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment pathway analysis showed that the enriched DEGs are involved in phenylpropanoid biosynthesis, glutathione metabolism, and plant hormone signal transduction. Moreover, the quercetin treatment led to an increase of the antioxidant enzyme activities of catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD) in rice roots. Also, the quercetin treatment altered the DR5:GUS expression pattern in the root tips. All of these data indicated that the flavonoids-mediated transcription changes of genes are related to the genes involved in cell wall remodeling, redox homeostasis, and auxin signaling, leading to a reduced cell division in the meristem zone and cell elongation in the elongation zone of roots. Full article
(This article belongs to the Special Issue Novel Insights into the Genetics of Root Development (2019))
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