S-glycoprotein-like protein regulates defense responses in Nicotiana plants against Ralstonia solanacearum.

Plant Physiology
Milimo MaimboAkinori Kiba

Abstract

RsRGA4 (for Ralstonia solanacearum-responsive gene A4) encodes a polypeptide similar to S-locus glycoprotein (SGP) from Brassica rapa and SGP-like proteins from Ipomoea trifida and Medicago truncatula. Therefore, we designated RsRGA4 as NtSGLP (for Nicotiana tabacum SGP-like protein) and NbSGLP (its Nicotiana benthamiana ortholog). NbSGLP is expressed in root, leaf, petal, gynoecium, and stamen. Expression of NbSGLP was strongly induced by inoculation with an avirulent strain of R. solanacearum (Rs8107) and slightly enhanced by inoculation with virulent R. solanacearum (RsOE1-1). Expression of NbSGLP was induced by inoculation with an hrpY-deficient mutant of RsOE1-1 and Rs8107. Expression was also induced by aminocyclopropane carboxylic acid and salicylic acid. Virus-induced gene silencing of NbSGLP enhanced the growth of Rs8107. Growth of RsOE1-1 and appearance of wilt symptoms were also accelerated in silenced plants. Expression of PR-1a and EREBP was reduced, and markers for basal defense, such as callose deposition and reduced vascular flow, were compromised in NbSGLP-silenced plants. Moreover, growth of Pseudomonas cichorii, Pseudomonas syringae pv tabaci, and P. syringae pv mellea was also enhanced in the silenced plants...Continue Reading

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Citations

Jun 4, 2013·Annual Review of Phytopathology·Muthappa Senthil-Kumar, Kirankumar S Mysore
May 9, 2014·Nature Communications·Nicolas SierroNikolai V Ivanov
Mar 15, 2012·Science China. Life Sciences·Changjun HuangXueping Zhou
Mar 8, 2016·The Plant Journal : for Cell and Molecular Biology·Carlos A VillarroelMerijn R Kant
Sep 7, 2013·Molecular Plant-microbe Interactions : MPMI·Patricia A RodriguezJorunn I B Bos
May 16, 2020·Journal of Experimental Botany·Akinori KibaYasufumi Hikichi

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