Bacterial Spot Race T4 Resistance and Yield Enhancement in Tomatoes Conferred by the Pepper Bs2 Gene in Florida Field Trials

Scott, JB; Vallad, Gary E.; Stall, Robert E.; Jeffrey, Brooke; Dahlbeck, Douglas; Staskawicz, Brian J.

doi:10.17660/actahortic.2011.914.84

Cited by 3 publications

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“…However, new races of the pathogen complex are frequently reported before novel singlegene resistance is fully deployed. The Bs2 gene from pepper was found to confer complete resistance to BS in transgenic tomato (Scott et al, 2011). However, it is not accepted by the general public for consumption in the USA.…”

Section: Discussionmentioning

confidence: 99%

Resistance to Xanthomonas perforans race T4 causing bacterial spot in tomato breeding lines

et al. 2017

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Tomato (Solanum lycopersicum) is the second most important vegetable crop in the world. Bacterial spot (BS) of tomato, caused by four species of Xanthomonas: X. euvesicatoria, X. vesicatoria, X. perforans and X. gardneri, results in severe loss in yield and quality due to defoliation and formation of lesions on fruits, respectively. Currently management practices do not offer effective control under conditions of high disease pressure. Thus, developing BS resistance is a critical priority for tomato growers in order to minimize crop losses. Sixty‐three advanced tomato breeding lines, heirlooms and wild tomato lines with diverse genetic backgrounds were screened under greenhouse and field conditions for BS resistance using X. perforans race T4, which was found to be a prevalent race in North Carolina. Race T4 isolate 9 was used to inoculate the plants by spraying, and disease severity was measured using the Horsfall–Barratt scale. Tomato lines 74L‐1W(2008), NC2CELBR, 081‐12‐1X‐gsms, NC22L‐1 (2008) and 52LB‐1 showed resistance to BS in the field and/or greenhouse trials. These lines were derived from S. pimpinellifolium L3707. Screening L3707 followed by development of a mapping population and mapping resistance genes might be useful for breeding resistance against BS in future breeding programmes.

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Section: Discussionmentioning

confidence: 99%

Resistance to Xanthomonas perforans race T4 causing bacterial spot in tomato breeding lines

et al. 2017

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“…It remains to be seen whether or not these alleles can be edited to ameliorate the deleterious effects on plant growth while retaining their ability to curb pathogen growth. There is widespread evidence to suggest that NHR has been successfully engineered to control host-adapted pathogens, mainly in horticultural crop species such as strawberry (Silva et al, 2015), peach (Jiwan et al, 2013) and tomato (Scott et al, 2010). The cloning of NHR genes from cereal crops will enable biotechnologists to determine the effectiveness of transferring such resistance as cassettes of multiple genes into closely related crop species.…”

Section: Reviewmentioning

confidence: 99%

Exploring and exploiting the boundaries of host specificity using the cereal rust and mildew models

et al. 2018

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Individual plants encounter a vast number of microbes including bacteria, viruses, fungi and oomycetes through their growth cycle, yet few of these pathogens are able to infect them. Plant species have diverged over millions of years, co-evolving with few specific pathogens. The host boundaries of most pathogen species can be clearly defined. In general, the greater the genetic divergence from the preferred host, the less likely that pathogen would be able to infect that plant species. Co-evolution and divergence also occur within pathogen species, leading to highly specialized subspecies with narrow host ranges. For example, cereal rust and mildew pathogens (Puccinia and Blumeria spp.) display high host specificity as a result of ongoing co-evolution with a narrow range of grass species. In rare cases, however, some plant species are in a transition from host to nonhost or are intermediate hosts (near nonhost). Barley was reported as a useful model for genetic and molecular studies of nonhost resistance due to rare susceptibility to numerous heterologous rust and mildew fungi. This review evaluates host specificity in numerous Puccinia/Blumeria-cereal pathosystems and discusses various approaches for transferring nonhost resistance (NHR) genes between crop species to reduce the impact of important diseases in food production.

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“…But whereas pepper breeders have enjoyed some success against the pathogen through the development of resistant cultivars ( Horvath et al, 2015 ), no resistant cultivars have been deployed in tomato against bacterial spot disease, despite decades of conventional breeding efforts ( Sim et al, 2015 ). The transfer of the Bs2 R -gene from pepper to tomato results in a very strong resistance to most species and races of bacterial spot in tomato ( Scott et al, 2011 ; Horvath et al, 2012 ). But pathogen strains have already emerged which have mutations in their avrBs2 , prompting tomato researchers to pursue more durable lines of defense.…”

Section: Applications Of Non-host Resistance For Crop Diseae Resistanmentioning

confidence: 99%

Mini Review: Potential Applications of Non-host Resistance for Crop Improvement

2016

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Plant breeding for disease resistance is crucial to sustain global crop production. For decades, plant breeders and researchers have extensively used host plant resistance genes (R-genes) to develop disease resistant cultivars. However, the general instability of R-genes in crop cultivars when challenged with diverse pathogen populations emphasizes the need for more stable means of resistance. Alternatively, non-host resistance is recognized as the most durable, broad-spectrum form of resistance against the majority of potential pathogens in plants and has gained great attention as an alternative target for managing resistance. While transgenic approaches have been utilized to transfer non-host resistance to host species, conventional breeding applications have been more elusive. Nevertheless, avenues for discovery and deployment of genetic loci for non-host resistance via hybridization are increasingly abundant, particularly when transferring genes among closely related species. In this mini review, we discuss current and developing applications of non-host resistance for crop improvement with a focus on the overlap between host and non-host mechanisms and the potential impacts of new technology.

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Bacterial Spot Race T4 Resistance and Yield Enhancement in Tomatoes Conferred by the Pepper Bs2 Gene in Florida Field Trials

Cited by 3 publications

References 0 publications

Resistance to Xanthomonas perforans race T4 causing bacterial spot in tomato breeding lines

Resistance to Xanthomonas perforans race T4 causing bacterial spot in tomato breeding lines

Exploring and exploiting the boundaries of host specificity using the cereal rust and mildew models

Mini Review: Potential Applications of Non-host Resistance for Crop Improvement

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