Xanthan induces plant susceptibility by suppressing callose deposition

Plant Physiology
Maximina H YunAdrian Alberto Vojnov

Abstract

Xanthan is the major exopolysaccharide secreted by Xanthomonas spp. Despite its diverse roles in bacterial pathogenesis of plants, little is known about the real implication of this molecule in Xanthomonas pathogenesis. In this study we show that in contrast to Xanthomonas campestris pv campestris strain 8004 (wild type), the xanthan minus mutant (strain 8397) and the mutant strain 8396, which is producing truncated xanthan, fail to cause disease in both Nicotiana benthamiana and Arabidopsis (Arabidopsis thaliana) plants. In contrast to wild type, 8397 and 8396 strains induce callose deposition in N. benthamiana and Arabidopsis plants. Interestingly, treatment with xanthan but not truncated xanthan, suppresses the accumulation of callose and enhances the susceptibility of both N. benthamiana and Arabidopsis plants to 8397 and 8396 mutant strains. Finally, in concordance, we also show that treatment with an inhibitor of callose deposition previous to infection induces susceptibility to 8397 and 8396 strains. Thus, xanthan suppression effect on callose deposition seems to be important for Xanthomonas infectivity.

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Citations

Dec 19, 2009·Glycobiology·Alba SilipoAntonio Molinaro
Sep 7, 2012·Molecular Plant-microbe Interactions : MPMI·Taha Abd El RahmanKamal Bouarab
Sep 1, 2012·Molecular Plant-microbe Interactions : MPMI·Alicia MamaníJuan Carlos Díaz Ricci
Oct 9, 2007·Molecular Plant-microbe Interactions : MPMI·Luciano A RiganoMaría Rosa Marano
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Sep 1, 2015·Molecular Plant Pathology·Minh-Phuong NguyenSang-Won Lee
Jul 29, 2016·Molecular Plant-microbe Interactions : MPMI·María Isabel BiancoAdrián A Vojnov
Oct 30, 2016·Genome Announcements·Jochen SchmidMareike Wenning

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