Rootstock-induced Scion Resistance Against Tobacco Mosaic Virus is Associated with the Induction of Defence-related Transcripts and Graft-transmissible MRNAs

Overview

Journal Mol Plant Pathol

Specialty Molecular Biology

Date 2023 May 16

PMID 37191642

Authors

Madhu Kappagantu

Matthew Brandon

Yvette B Tamukong

James N Culver

Affiliations

Soon will be listed here.

Abstract

Grafting is a common horticultural practice used to confer desirable traits between rootstock and scion, including disease resistance. To investigate graft-conferred resistance against viral diseases a novel heterografting system was developed using Nicotiana benthamiana scions grafted onto different tomato rootstocks. N. benthamiana is normally highly susceptible to tobacco mosaic virus (TMV) infection. However, specific tomato rootstock varieties were found to confer a range of resistance levels to N. benthamiana scions inoculated with TMV. Conferred resistance was associated with delays in virus accumulation and the reduction in virus spread. RNA sequencing analysis showed the enrichment of transcripts associated with disease resistance and plant stress in N. benthamiana scions grafted onto resistance-inducing tomato rootstocks. Genome sequencing of resistance- and nonresistance-conferring rootstocks was used to identify mobile tomato transcripts within N. benthamiana scions. Within resistance-induced N. benthamiana scions, enriched mobile tomato transcripts were predominantly associated with defence, stress, and abscisic acid signalling when compared to similar scions grafted onto nonresistance-inducing rootstock. Combining these findings suggests that graft-induced resistance is modulated by rootstock scion transcriptional responses and rootstock-specific mobile transcripts.

Citing Articles

Rootstock-induced scion resistance against tobacco mosaic virus is associated with the induction of defence-related transcripts and graft-transmissible mRNAs.

Kappagantu M, Brandon M, Tamukong Y, Culver J Mol Plant Pathol. 2023; 24(9):1184-1191.

PMID: 37191642 PMC: 10423323. DOI: 10.1111/mpp.13353.

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