Characterization of polygenic resistance to powdery mildew in tomato at cytological, biochemical and gene expression level

Li, Chengwei and Faino, Luigi and Dong, Lin and Fan, Junmei and Kiss, Levente and de Giovanni, Claudio and Lebeda, Ales and Scott, John and Matsuda, Yoshinori and Toyoda, Hideyoshi and Lindhout, Pim and Visser, Richard G. F. and Bonnema, Guusje and Bai, Yuling (2012) Characterization of polygenic resistance to powdery mildew in tomato at cytological, biochemical and gene expression level. Molecular Plant Pathology, 13 (2). pp. 148-159. ISSN 1464-6722

Abstract

Extensive research in the area of plant innate immunity has increased considerably our understanding of the molecular mechanisms associated with resistance controlled by a dominant resistance gene. In contrast, little is known about the molecular basis underlying the resistance conferred by quantitative trait loci (QTLs). In this study, using the interaction of tomato (Solanum lycopersicum) with Oidium neolycopersici, we compared the cytological, biochemical and molecular mechanisms involved in both monogenic and polygenic resistances conferred by a dominant gene (Ol-1) and three QTLs (Ol-qtls), respectively. Our results showed that the three Ol-qtls jointly confer a very high level of broad-spectrum resistance and that the resistance is associated with both the hypersensitive response and papillae formation, with the hypersensitive response being prevalent. Both H2O2 and callose accumulation, which are coupled with Ol-1-mediated resistance, are also associated with the resistance conferred by Ol-qtls. Further, we analysed the pathogen-induced transcript profiles of near-isogenic lines carrying the three Ol-qtls and the Ol-1 gene. Transcript profiles obtained by cDNA-amplified fragment length polymorphism analysis showed that, on fungal challenge, about 70% of the transcript-derived fragments are up-regulated in both susceptible and resistant genotypes. Most of the sequenced transcript-derived fragments showed homology to genes with functions in defence responses, suggesting that defence-responsive genes responsible for basal defence are involved in both monogenic and polygenic resistances conferred by Ol-1 and Ol-qtls, respectively. Although about 18% of the identified transcript-derived fragments are specific for either monogenic or polygenic resistance, their expression patterns need to be further verified by quantitative reverse transcriptase-polymerase chain reaction.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: No
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version due to publisher copyright policy. However, article can be freely accessed through the publisher's website at: http://onlinelibrary.wiley.com/doi/10.1111/j.1364-3703.2011.00737.x/abstract
Faculty / Department / School: No Faculty
Date Deposited: 07 Jun 2017 23:54
Last Modified: 03 Jul 2017 05:26
Uncontrolled Keywords: Ascomycota; disease resistance; gene expression profiling; gene expression regulation; plant genes, Glucans; Hydrogen Peroxide; inbreeding; Lycopersicon esculentum; multifactorial inheritance; plant diseases; plant leaves; reproducibility of results; Reverse Transcriptase Polymerase Chain Reaction; Messenger RNA; species specificity; tomato; Solanum lycopersicum; Oidium neolycopersici; ( Ol-1; Ol-qtls;
Fields of Research : 06 Biological Sciences > 0607 Plant Biology > 060704 Plant Pathology
06 Biological Sciences > 0605 Microbiology > 060505 Mycology
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
Identification Number or DOI: 10.1111/j.1364-3703.2011.00737.x
URI: http://eprints.usq.edu.au/id/eprint/31888

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