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Open AccessArticle

Involvement of SUT1 and SUT2 Sugar Transporters in the Impairment of Sugar Transport and Changes in Phloem Exudate Contents in Phytoplasma-Infected Plants

1
Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France
2
UMR 1332 Biologie du Fruit et Pathologie, INRAE et Université de Bordeaux, CS20032, 33140 Villenave d’Ornon CEDEX, France
3
Plant Science Division, Research School of Biology, The Australian National University, Canberra, ACT 0200, Australia
4
UMR IGEPP, INRAE, Agrocampus Ouest, Université de Rennes 1, 35653 Le Rheu CEDEX, France
5
Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Univ Evry, 91405 Orsay, France
6
Institute of Plant Sciences Paris-Saclay (IPS2), Université de Paris, CNRS, INRAE, 91405 Orsay, France
7
UMR MIA-Paris, AgroParisTech, INRAE, Université Paris-Saclay, 75005 Paris, France
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2021, 22(2), 745; https://doi.org/10.3390/ijms22020745
Received: 11 December 2020 / Revised: 30 December 2020 / Accepted: 8 January 2021 / Published: 13 January 2021
(This article belongs to the Section Molecular Biology)
Phytoplasmas inhabit phloem sieve elements and cause abnormal growth and altered sugar partitioning. However, how they interact with phloem functions is not clearly known. The phloem responses were investigated in tomatoes infected by “Candidatus Phytoplasma solani” at the beginning of the symptomatic stage, the first symptoms appearing in the newly emerged leaf at the stem apex. Antisense lines impaired in the phloem sucrose transporters SUT1 and SUT2 were included. In symptomatic sink leaves, leaf curling was associated with higher starch accumulation and the expression of defense genes. The analysis of leaf midribs of symptomatic leaves indicated that transcript levels for genes acting in the glycolysis and peroxisome metabolism differed from these in noninfected plants. The phytoplasma also multiplied in the three lower source leaves, even if it was not associated with the symptoms. In these leaves, the rate of phloem sucrose exudation was lower for infected plants. Metabolite profiling of phloem sap-enriched exudates revealed that glycolate and aspartate levels were affected by the infection. Their levels were also affected in the noninfected SUT1- and SUT2-antisense lines. The findings suggest the role of sugar transporters in the responses to infection and describe the consequences of impaired sugar transport on the primary metabolism. View Full-Text
Keywords: phloem; peroxisome; sugar metabolism; glyoxylate; glycolate; source-sink relationships; carbon allocation; photorespiration; metabolome; plant-pathogen interaction; phytoplasma; defense phloem; peroxisome; sugar metabolism; glyoxylate; glycolate; source-sink relationships; carbon allocation; photorespiration; metabolome; plant-pathogen interaction; phytoplasma; defense
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MDPI and ACS Style

Marco, F.D.; Batailler, B.; Thorpe, M.R.; Razan, F.; Le Hir, R.; Vilaine, F.; Bouchereau, A.; Martin-Magniette, M.-L.; Eveillard, S.; Dinant, S. Involvement of SUT1 and SUT2 Sugar Transporters in the Impairment of Sugar Transport and Changes in Phloem Exudate Contents in Phytoplasma-Infected Plants. Int. J. Mol. Sci. 2021, 22, 745. https://doi.org/10.3390/ijms22020745

AMA Style

Marco FD, Batailler B, Thorpe MR, Razan F, Le Hir R, Vilaine F, Bouchereau A, Martin-Magniette M-L, Eveillard S, Dinant S. Involvement of SUT1 and SUT2 Sugar Transporters in the Impairment of Sugar Transport and Changes in Phloem Exudate Contents in Phytoplasma-Infected Plants. International Journal of Molecular Sciences. 2021; 22(2):745. https://doi.org/10.3390/ijms22020745

Chicago/Turabian Style

Marco, Federica D.; Batailler, Brigitte; Thorpe, Michael R.; Razan, Frédérique; Le Hir, Rozenn; Vilaine, Françoise; Bouchereau, Alain; Martin-Magniette, Marie-Laure; Eveillard, Sandrine; Dinant, Sylvie. 2021. "Involvement of SUT1 and SUT2 Sugar Transporters in the Impairment of Sugar Transport and Changes in Phloem Exudate Contents in Phytoplasma-Infected Plants" Int. J. Mol. Sci. 22, no. 2: 745. https://doi.org/10.3390/ijms22020745

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