Eggplant and related species are promising genetic resources to dissect the plant immune response to Pseudomonas syringae and Xanthomonas euvesicatoria and to identify new resistance determinants. (7th May 2014)

• Record Type: Journal Article
• Authors: Clarke, Christopher R.; Hayes, Byron W.; Runde, Brendan J.; Wicker, Emmanuel; Vinatzer, Boris A.
• Is Part Of: Molecular plant pathology. Volume 15:Number 8(2014:Oct.)
• Page Start: 814
• Page End: 822
• Publication Date: 2014-05-07
• Subjects: Plant diseases -- Molecular aspects -- Periodicals; Plant-pathogen relationships -- Molecular aspects -- Periodicals; 571.936
• DOI: 10.1111/mpp.12140
• Languages: English
• ISSNs: 1464-6722

Abstract

<abstract abstract-type="main"> <title>Summary</title> <p>The apparent lack of durability of many resistance (<italic>R</italic>) genes highlights the need for the constant identification of new genetic sources of resistance for the breeding of new disease‐resistant crop cultivars. To this end, we screened a collection of accessions of eggplant and close relatives for resistance against <italic>Pseudomonas syringae</italic> pv. <italic>tomato</italic> (<italic>Pto</italic>) and <italic>Xanthomonas euvesicatoria</italic> (<italic>Xeu</italic>), foliar plant pathogens of many solanaceous crops. Both pathogens caused substantial disease on most genotypes of eggplant and its relatives. Promisingly, however, some of the genotypes were fully or partially resistant to either of the pathogens, suggesting the presence of effective resistance determinants in these genotypes. Segregation of resistance to the growth of <italic>Xeu</italic> following infiltration in F2 progeny from a cross of a resistant and susceptible genotype suggests that resistance to <italic>Xeu</italic> is inherited as a multigenic trait. With regard to <italic>Pto</italic>, a mutant strain lacking all 28 functional type III secreted effectors, and a <italic>Pseudomonas fluorescens</italic> strain expressing a <italic>P. syringae</italic> type III secretion system (T3SS), both elicit a strong cell death response on most eggplant lines. Several genotypes thus appear to harbour a mechanism for the direct recognition of a component of the T3SS. Therefore, eggplant and its close relatives are promising resources to unravel novel aspects of plant immunity and to identify new candidate <italic>R</italic> genes that could be employed in other Solanaceae in which <italic>Xeu</italic> and <italic>Pto</italic> cause agriculturally relevant diseases.</p> </abstract>