Identification of Tomato Bacterial Spot Race T1, T2, T3, T4, and Xanthomonas Gardneri Resistance QTLS Derived From Pi 114490 Populations Selected for Race T4

Scott, JB; Hutton, Samuel F.; Shekasteband, Reza; Sim, Sung-Chur; Francis, Darryl

doi:10.17660/actahortic.2015.1069.6

Cited by 14 publications

(19 citation statements)

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“…However, the role of Rx1 in conferring resistance to bacterial spot in the field condition was not identified in the population studied and no polymorphic markers were identified to be linked with Rx2. The correlation between the HR and field resistance was relatively low between 0.31 and 0.37 in different populations [28,31]. A novel QTL in chromosome 1 was identified where Rx-2 was previously identified [31].…”

Section: Race T1mentioning

confidence: 90%

“…The correlation between the HR and field resistance was relatively low between 0.31 and 0.37 in different populations [28,31]. A novel QTL in chromosome 1 was identified where Rx-2 was previously identified [31]. However, the source for this QTL was not HI 7998 but Florida (FL) 7600 or OH9242.…”

Section: Race T1mentioning

confidence: 95%

“…Polymorphic markers identified in the BC1 population inherited from LA716 were linked to susceptibility. In a separate study, a locus linked to bacterial spot susceptibility was identified on chromosome 4 of HI7998 [31]. Additional polymorphic markers, mainly in Rx3 region, were identified from a F 2 population derived from a cross between HI7998 and an elite breeding line Ohio (OH) 88119.…”

Section: Race T1mentioning

confidence: 99%

“…In a segregating F 2 population developed from PI114490 and FL7600, the resistance was observed to be likely controlled by two-genes with additive nature, requiring all four alleles to confer maximum resistance [50]. From the inbred backcross population of (PI114490 X FL7600) cross with OH9242, identified seven markers linked to T2 resistance corresponding to five chromosomal regions in PI114490 of which two were linked with susceptibility to T2 and one with T2 resistance [31]. However, limited phenotypic variation (<15%) was explained due to each QTLs owing to the incomplete coverage of the genome (60%) by the markers or presence of other loci conferring the resistance by independent smaller effects or interaction between them [31].…”

Section: Racementioning

confidence: 99%

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Progress in Developing Bacterial Spot Resistance in Tomato

Sharma

Bhattarai

2019

Agronomy

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Bacterial spot (BS), caused by four species of Xanthomonas: X. euvesicatoria, X. vesicatoria, X. perforans and X. gardneri in tomato (Solanum lycopersicum L.) results in severe loss in yield and quality by defoliation and the appearance of lesions on fruits, respectively. The combined industry standard for BS control (foliar applications Actigard ® rotated with copper plus mancozeb) does not offer sufficient protection, especially when weather conditions favor disease spread. Development of tomato cultivars with BS resistance is thus an important measure to minimize losses. Hypersensitive and non-hypersensitive resistance has been identified in different wild accessions and cultivated tomato relatives and has been transferred to cultivated tomato. However, complete resistance is yet to be obtained. With the advent of next generation sequencing and precise genome editing tools, the genetic regions that confer resistance to bacterial spot can be targeted and enriched through gene pyramiding in a new commercial cultivar which may confer higher degree of horizontal resistance to multiple strains of Xanthomonas causing bacterial spot in tomato.

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Section: Race T1mentioning

confidence: 90%

Section: Race T1mentioning

confidence: 95%

Section: Race T1mentioning

confidence: 99%

Section: Racementioning

confidence: 99%

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Progress in Developing Bacterial Spot Resistance in Tomato

Sharma

Bhattarai

2019

Agronomy

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“…Both molecular and biotechnological approaches have been used in identifying resistance (Horvath et al, 2015;Bhattarai et al, 2016). Quantitative trait loci (QTLs) derived from PI114490 have been identified for T1, T2, T3, T4 races and X. gardneri (Scott et al, 2015) and a BS resistance locus, RXopJ4, from Solanum pennellii LA716 has been fine-mapped (Sharlach et al, 2013). A combination of traditional genetic information through pedigrees and clustering with the molecular information is being integrated in search of bacterial disease resistance (Sharlach et al, 2013;Bhattarai et al, 2016).…”

Section: Introductionmentioning

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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