Source-to-sink transport of sugar and regulation by environmental factors
Rémi Lemoine,Sylvain La Camera,Rossitza Atanassova,Fabienne Dédaldéchamp,Thierry Allario,Nathalie Pourtau,Jean-Louis Bonnemain,Maryse Laloi,Pierre Coutos-Thévenot,Laurence Maurousset,Mireille Faucher,Christine Girousse,Pauline Lemonnier,Jonathan Parrilla,Mickaël Durand +14 more
TLDR
Current knowledge about the phloem transport mechanisms is summarized and the effects of several abiotic (water and salt stress, mineral deficiency, CO2, light, temperature, air, and soil pollutants) and biotic andmutualistic and pathogenic microbes, viruses, aphids, and parasitic plants are reviewed.Abstract:
Source-to-sink transport of sugar is one of the major determinants of plant growth and relies on the efficient and controlled distribution of sucrose (and some other sugars such as raffinose and polyols) across plant organs through the phloem. However, sugar transport through the phloem can be affected by many environmental factors that alter source/sink relationships. In this paper, we summarize current knowledge about the phloem transport mechanisms and review the effects of several abiotic (water and salt stress, mineral deficiency, CO2, light, temperature, air, and soil pollutants) and biotic (mutualistic and pathogenic microbes, viruses, aphids, and parasitic plants) factors. Concerning abiotic constraints, alteration of the distribution of sugar among sinks is often reported, with some sinks as roots favored in case of mineral deficiency. Many of these constraints impair the transport function of the phloem but the exact mechanisms are far from being completely known. Phloem integrity can be disrupted (e.g., by callose deposition) and under certain conditions, phloem transport is affected, earlier than photosynthesis. Photosynthesis inhibition could result from the increase in sugar concentration due to phloem transport decrease. Biotic interactions (aphids, fungi, viruses…) also affect crop plant productivity. Recent breakthroughs have identified some of the sugar transporters involved in these interactions on the host and pathogen sides. The different data are discussed in relation to the phloem transport pathways. When possible, the link with current knowledge on the pathways at the molecular level will be highlighted.read more
Citations
More filters
Journal ArticleDOI
Dynamic root exudate chemistry and microbial substrate preferences drive patterns in rhizosphere microbial community assembly.
Kateryna Zhalnina,Katherine B. Louie,Zhao Hao,Nasim Mansoori,Ulisses Nunes da Rocha,Ulisses Nunes da Rocha,Shengjing Shi,Heejung Cho,Heejung Cho,Ulas Karaoz,Dominique Loqué,Benjamin P. Bowen,Mary K. Firestone,Mary K. Firestone,Trent R. Northen,Eoin L. Brodie,Eoin L. Brodie +16 more
TL;DR: It is shown that pre-programmed developmental processes in plants result in consistent patterns in the chemical composition of root exudates, which provides a mechanistic underpinning for the process of rhizosphere microbial community assembly and provides an attractive direction for the manipulation of the Rhizosphere microbiome for beneficial outcomes.
Journal ArticleDOI
Multiple functional roles of anthocyanins in plant-environment interactions.
TL;DR: In addition to the most frequently discussed putative roles of anthocyanins as antioxidants and sunscreens, other less-explored possibilities might equally serve to ameliorate plant function under, for example, under conditions of mineral imbalance.
Journal ArticleDOI
Potassium: A Vital Regulator of Plant Responses and Tolerance to Abiotic Stresses
Mirza Hasanuzzaman,Mhm Borhannuddin Bhuyan,Kamrun Nahar,M A Hossain,Jubayer Al Mahmud,Md. Sakib Hossen,Abdul Awal Chowdhury Masud,Moumita,Masayuki Fujita +8 more
TL;DR: In this review, the recent literature on the biological functions of K, its uptake, its translocation, and its role in plant abiotic stress tolerance are summarized.
Journal ArticleDOI
Role of sugars under abiotic stress.
TL;DR: This review focuses the correlation between sugars and their protective functions in several physiological processes against various abiotic stresses and enlightens the interaction of sugars with several phytohormones and its effect on their biosynthesis under abiotic stress conditions.
Journal ArticleDOI
Understanding and manipulating sucrose phloem loading, unloading, metabolism, and signalling to enhance crop yield and food security
TL;DR: The current understanding of the control of carbon partitioning from the cellular to whole-plant levels is discussed, focusing on the pathways employed for phloem loading in source leaves, particularly in grasses, and the routes used in sink organs forphloem unloading.
References
More filters
Journal ArticleDOI
Sugar Sensing and Signaling in Plants: Conserved and Novel Mechanisms
TL;DR: In this article, the experimental amenability of yeast as a unicellular model system has enabled the discovery of multiple sugar sensors and signaling pathways, and a central role for hexokinase (HXK) as conserved glucose sensor.
Journal ArticleDOI
More Efficient Plants : a consequence of rising atmospheric CO2
TL;DR: The primary effect of plants response of plants to rising atmospheric CO2 (Ca) is to increase resource use efficiency, and at the same time it stimulates higher rates of photosynthesis and increases light-use efficiency as discussed by the authors.
Journal ArticleDOI
When Defense Pathways Collide. The Response of Arabidopsis to a Combination of Drought and Heat Stress
Ludmila Rizhsky,Hongjian Liang,Joel L. Shuman,Vladimir Shulaev,Sholpan Davletova,Ron Mittler +5 more
TL;DR: In this paper, the response of Arabidopsis plants to a combination of drought and heat stress was found to be distinct from that of plants subjected to either drought or heat stress, and the authors highlighted the plasticity of the plant genome and demonstrate its ability to respond to complex environmental conditions that occur in the field.
Journal ArticleDOI
Sucrose metabolism: regulatory mechanisms and pivotal roles in sugar sensing and plant development
TL;DR: The extent, path, and site of sucrose metabolism are thus highly responsive to both internal and external environmental signals and can, in turn, dramatically alter development and stress acclimation.
Journal ArticleDOI
Sugar transporters for intercellular exchange and nutrition of pathogens
Li Qing Chen,Bi Huei Hou,Sylvie Lalonde,Hitomi Takanaga,Mara L. Hartung,Xiao Qing Qu,Woei Jiun Guo,Jung Gun Kim,William Underwood,Bhavna Chaudhuri,Diane Chermak,Ginny Antony,Frank F. White,Shauna Somerville,Mary Beth Mudgett,Wolf B. Frommer +15 more
TL;DR: Using optical glucose sensors, a new class of sugar transporters are identified, named SWEETs, and it is shown that at least six out of seventeen Arabidopsis, two out of over twenty rice and two of seven homologues in Caenorhabditis elegans, and the single copy human protein, mediate glucose transport.