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Sugar Transport in Plants
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Sugar Transport in Plants

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Plant Sciences".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 17336

Special Issue Editor

Dr. Li-Qing Chen

E-Mail Website
Guest Editor
Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
Interests: sugar partitioning; sugar transporters; crop yield

Special Issue Information

Dear Colleagues,

Non-photosynthetic tissues rely on sugar supply from distant photosynthetic tissues, a process that is mediated by cell-type-specific sugar transporters in many plants. Subcellular sugar exchanges also rely on subcellular-specific localized sugar transporters. Besides, sugar transporters play a vital role in other biological processes like nectar secretion, seed filling, carbon storage, and host–pathogen interaction. However, the physiological functions of many sugar transporters have remained elusive. We know little of their regulation and the molecular structures responsible for their substrate specificity and functions.

This Special Issue aims to collect manuscripts covering the current progress in the functional characterization of sugar transporters from plants and translational studies for crop improvement. The central focus will be research progress on physiological functions, regulation, and molecular structures including the use of integrative approaches to evaluate the function of uncharacterized transporters, expression patterns, and protein–protein interactions. All manuscripts, including original research articles, reviews, and methodology papers, are highly encouraged.

Dr. Li-Qing Chen
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 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. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. There is an Article Processing Charge (APC) for publication in this open access journal. For details about the APC please see here. 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.

Published Papers (6 papers)

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Editorial

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2 pages, 175 KiB  
Editorial
Improved Understanding of Sugar Transport in Various Plants
by Li-Qing Chen
Int. J. Mol. Sci. 2022, 23(18), 10260; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms231810260 - 06 Sep 2022
Cited by 2 | Viewed by 1125
Abstract
A few recent reviews have addressed progress and perspectives in the field of sugar transport in plants rather comprehensively [...] Full article
(This article belongs to the Special Issue Sugar Transport in Plants)

Research

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17 pages, 5215 KiB  
Article
Expression Patterns of Sugar Transporter Genes in the Allocation of Assimilates and Abiotic Stress in Lily
by Zhen Zeng, Tong Lyu, Xin Jia, Yue Chen and Yingmin Lyu
Int. J. Mol. Sci. 2022, 23(8), 4319; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms23084319 - 13 Apr 2022
Cited by 6 | Viewed by 1970
Abstract
During the growth cycle of lilies, assimilates undergo a process of accumulation, consumption and reaccumulation in bulbs and are transported and allocated between aboveground and underground organs and tissues. The sink–source relationship changes with the allocation of assimilates, affecting the vegetative growth and [...] Read more.
During the growth cycle of lilies, assimilates undergo a process of accumulation, consumption and reaccumulation in bulbs and are transported and allocated between aboveground and underground organs and tissues. The sink–source relationship changes with the allocation of assimilates, affecting the vegetative growth and morphological establishment of lilies. In this study, the carbohydrate contents in different tissues of five critical stages during lily development were measured to observe the assimilates allocation. The results showed bulbs acted as the main source to provide energy before the budding stage (S3); after the flowering stage (S4), bulbs began to accumulate assimilates as a sink organ again. During the period when the plant height was 30cm with leaf-spread (S2), leaves mainly accumulated assimilates from bulbs through the symplastic pathway, while when leaves were fully expanded, it transformed to export carbohydrates. At the S4 stage, flowers became a new active sink with assimilates influx. To further understand the allocation of assimilates, 16 genes related to sugar transport and metabolism (ST genes) were identified and categorized into different subfamilies based on the phylogenetic analysis, and their protein physicochemical properties were also predicted. Tissue-specific analysis showed that most of the genes were highly expressed in stems and petals, and it was mainly the MST (monosaccharide transporter) genes that were obviously expressed in petals during the S4 stage, suggesting that they may be associated with the accumulation of carbohydrates in flowers and thus affect flower development process. LoSWEET14 (the Sugar will eventually be exported transporters) was significantly correlated with starch in scales and with soluble sugar in leaves. Sugar transporters LoHXT6 and LoSUT1 were significantly correlated with soluble sugar and sucrose in leaves, suggesting that these genes may play key roles in the accumulation and transportation of assimilates in lilies. In addition, we analyzed the expression patterns of ST genes under different abiotic stresses, and the results showed that all genes were significantly upregulated. This study lays a solid foundation for further research on molecular mechanism of sink–source change and response to abiotic stresses in lilies. Full article
(This article belongs to the Special Issue Sugar Transport in Plants)
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19 pages, 6754 KiB  
Article
Comparative Analysis of Sugar Metabolites and Their Transporters in Sugarcane Following Sugarcane mosaic virus (SCMV) Infection
by Sehrish Akbar, Wei Yao, Lifang Qin, Yuan Yuan, Charles A. Powell, Baoshan Chen and Muqing Zhang
Int. J. Mol. Sci. 2021, 22(24), 13574; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms222413574 - 17 Dec 2021
Cited by 13 | Viewed by 2931
Abstract
Sugarcane mosaic virus (SCMV) is one of the major pathogens of sugarcane. SCMV infection causes dynamic changes in plant cells, including decreased photosynthetic rate, respiration, and sugar metabolism. To understand the basics of pathogenicity mechanism, we performed transcriptome and proteomics analysis in two [...] Read more.
Sugarcane mosaic virus (SCMV) is one of the major pathogens of sugarcane. SCMV infection causes dynamic changes in plant cells, including decreased photosynthetic rate, respiration, and sugar metabolism. To understand the basics of pathogenicity mechanism, we performed transcriptome and proteomics analysis in two sugarcane genotypes (Badila: susceptible to SCMV and B-48: SCMV resistant). Using Saccharum spontaneum L. genome as a reference, we identified the differentially expressed genes (DEGs) and differentially expressed proteins (DEPs) that participate in sugar metabolism, transport of their metabolites, and Carbohydrate Activating enZYmes (CAZymes). Sequencing data revealed 287 DEGs directly or indirectly involved in sugar metabolism, transport, and storage, while 323 DEGs are associated with CAZymes. Significant upregulation of glucose, sucrose, fructose, starch, and SWEET-related transcripts was observed in the Badila after infection of SCMV. B-48 showed resistance against SCMV with a limited number of sugar transcripts up-regulation at the post-infection stage. For CAZymes, only glycosyltransferase (GT)1 and glycosyl hydrolase (GH)17 were upregulated in B-48. Regulation of DEGs was analyzed at the proteomics level as well. Starch, fructose, glucose, GT1, and GH17 transcripts were expressed at the post-translational level. We verified our transcriptomic results with proteomics and qPCR data. Comprehensively, this study proved that Badila upregulated sugar metabolizing and transporting transcripts and proteins, which enhance virus multiplication and infectionl. Full article
(This article belongs to the Special Issue Sugar Transport in Plants)
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15 pages, 4457 KiB  
Article
Hetero/Homo-Complexes of Sucrose Transporters May Be a Subtle Mode to Regulate Sucrose Transportation in Grape Berries
by Yumeng Cai, Ling Yin, Jie Wang, Wenjie Dong, Han Gao, Jinxu Xu, Zhefang Deng, Wenrui Tu, Jing Yan, Qingyong Meng and Yali Zhang
Int. J. Mol. Sci. 2021, 22(21), 12062; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms222112062 - 08 Nov 2021
Cited by 4 | Viewed by 1601
Abstract
The sugar distribution mechanism in fruits has been the focus of research worldwide; however, it remains unclear. In order to elucidate the relevant mechanisms in grape berries, the expression, localization, function, and regulation of three sucrose transporters were studied in three representative Vitis [...] Read more.
The sugar distribution mechanism in fruits has been the focus of research worldwide; however, it remains unclear. In order to elucidate the relevant mechanisms in grape berries, the expression, localization, function, and regulation of three sucrose transporters were studied in three representative Vitis varieties. Both SUC11 and SUC12 expression levels were positively correlated with sugar accumulation in grape berries, whereas SUC27 showed a negative relationship. The alignment analysis and sucrose transport ability of isolated SUCs were determined to reflect coding region variations among V. vinifera, V. amurensis Ruper, and V. riparia, indicating that functional variation existed in one SUT from different varieties. Furthermore, potentially oligomerized abilities of VvSUCs colocalized in the sieve elements of the phloem as plasma membrane proteins were verified. The effects of oligomerization on transport properties were characterized in yeast. VvSUC11 and VvSUC12 are high-affinity/low-capacity types of SUTs that stimulate each other by upregulating Vmax and Km, inhibiting sucrose transport, and downregulating the Km of VvSUC27. Thus, changes in the distribution of different SUTs in the same cell govern functional regulation. The activation and inhibition of sucrose transport could be achieved in different stages and tissues of grape development to achieve an effective distribution of sugar. Full article
(This article belongs to the Special Issue Sugar Transport in Plants)
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Review

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11 pages, 964 KiB  
Review
Sugar Transport, Metabolism and Signaling in Fruit Development of Litchi chinensis Sonn: A Review
by Shuying Fan, Dan Wang, Hanhan Xie, Huicong Wang, Yonghua Qin, Guibing Hu and Jietang Zhao
Int. J. Mol. Sci. 2021, 22(20), 11231; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms222011231 - 18 Oct 2021
Cited by 7 | Viewed by 4490
Abstract
Litchi chinensis Sonn. is an important evergreen fruit crop cultivated in the tropical and subtropical regions. The edible portion of litchi fruit is the aril, which contains a high concentration of sucrose, glucose, and fructose. In this study, we review various aspects of [...] Read more.
Litchi chinensis Sonn. is an important evergreen fruit crop cultivated in the tropical and subtropical regions. The edible portion of litchi fruit is the aril, which contains a high concentration of sucrose, glucose, and fructose. In this study, we review various aspects of sugar transport, metabolism, and signaling during fruit development in litchi. We begin by detailing the sugar transport and accumulation during aril development, and the biosynthesis of quebrachitol as a transportable photosynthate is discussed. We then document sugar metabolism in litchi fruit. We focus on the links between sugar signaling and seed development as well as fruit abscission. Finally, we outline future directions for research on sugar metabolism and signaling to improve fruit yield and quality. Full article
(This article belongs to the Special Issue Sugar Transport in Plants)
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12 pages, 314 KiB  
Review
Rice SUT and SWEET Transporters
by Zhi Hu, Zhenjia Tang, Yanming Zhang, Liping Niu, Fang Yang, Dechun Zhang and Yibing Hu
Int. J. Mol. Sci. 2021, 22(20), 11198; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms222011198 - 18 Oct 2021
Cited by 26 | Viewed by 4013
Abstract
Sugar transporters play important or even indispensable roles in sugar translocation among adjacent cells in the plant. They are mainly composed of sucrose–proton symporter SUT family members and SWEET family members. In rice, 5 and 21 members are identified in these transporter families, [...] Read more.
Sugar transporters play important or even indispensable roles in sugar translocation among adjacent cells in the plant. They are mainly composed of sucrose–proton symporter SUT family members and SWEET family members. In rice, 5 and 21 members are identified in these transporter families, and some of their physiological functions have been characterized on the basis of gene knockout or knockdown strategies. Existing evidence shows that most SUT members play indispensable roles, while many SWEET members are seemingly not so critical in plant growth and development regarding whether their mutants display an aberrant phenotype or not. Generally, the expressions of SUT and SWEET genes focus on the leaf, stem, and grain that represent the source, transport, and sink organs where carbohydrate production, allocation, and storage take place. Rice SUT and SWEET also play roles in both biotic and abiotic stress responses in addition to plant growth and development. At present, these sugar transporter gene regulation mechanisms are largely unclear. In this review, we compare the expressional profiles of these sugar transporter genes on the basis of chip data and elaborate their research advances. Some suggestions concerning future investigation are also proposed. Full article
(This article belongs to the Special Issue Sugar Transport in Plants)
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