Sources of Resistance, Inheritance, and Location of Genetic Loci Conferring Resistance to Members of the Tomato-Infecting Begomoviruses

Ji, Yuanfu; Scott, John W.; Hanson, Peter; Graham, Elaine; Maxwell, D. P.

doi:10.1007/978-1-4020-4769-5_20

Cited by 91 publications

(74 citation statements)

References 49 publications

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“…They are not immune to infection but may give an acceptable yield even when infected [75,76]. The resistance has been crossed into tomato from wild relatives [77]. Common resistance genes in tomato are the allelic genes Ty-1 and Ty-3, which originate from accessions of Solanum chilense.…”

Section: Resistancementioning

confidence: 99%

Begomovirus disease complex: emerging threat to vegetable production systems of West and Central Africa

et al. 2015

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Vegetables play a major role in the livelihoods of the rural poor in Africa. Among major constraints to vegetable production worldwide are diseases caused by a group of viruses belonging to the genus Begomovirus, family Geminiviridae. Begomoviruses are plant-infecting viruses, which are transmitted by the whitefly vector Bemisia tabaci and have been known to cause extreme yield reduction in a number of economically important vegetables around the world. Several begomoviruses have been detected infecting vegetable crops in West and Central Africa (WCA). Small single stranded circular molecules, alphasatellites and betasatellites, which are about half the size of their helper begomovirus genome, have also been detected in plants infected by begomoviruses. In WCA, B. tabaci has been associated with suspected begomovirus infections in many vegetable crops and weed species. Sequencing of viral genomes from crops such as okra resulted in the identification of two previously known begomovirus species (Cotton leaf curl Gezira virus and Okra yellow crinkle virus) as well as a new recombinant begomovirus species (Okra leaf curl Cameroon virus), a betasatellite (Cotton leaf curl Gezira betasatellite) and new alphasatellites. Tomato and pepper plants with leaf curling were shown to contain isolates of new begomoviruses, collectively referred to as West African tomato-infecting begomoviruses (WATIBs), new alphasatellites and betasatellites. To study the potential of weeds serving as begomovirus reservoirs, begomoviruses and satellites in the weed Ageratum conyzoides were characterized. Sequence analyses showed that they were infected by isolates of a new begomovirus (Ageratum leaf curl Cameroon virus) that belong to the WATIBs group, a new betasatellite (Ageratum leaf curl Cameroon betasatellite), an alphasatellite and two types of defective recombinants between a begomovirus and an alphasatellite. Putative recombinations were detected in begomovirus genomes for all four plant species studied, indicating that recombination is an important mechanism for their evolution. A close relationship between the begomoviruses infecting pepper and tomato and A. conyzoides and the detection of the same alphasatellite in them support the idea that weeds are important reservoirs for begomoviruses and their satellites. With this high diversity, recombination potential and transmission by B. tabaci, begomoviruses and ssDNA satellites pose a serious threat to crop production in West and Central Africa.

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Section: Resistancementioning

confidence: 99%

Begomovirus disease complex: emerging threat to vegetable production systems of West and Central Africa

et al. 2015

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“…Crop management using physical barriers or UV-absorbing plastic films and screens in protected crops can also help control TYLCD (Antignus et al 2001). Although the use of virusresistant cultivars is currently the best alternative for controlling TYLCD, limited sources of resistance useful at the commercial level are available, which greatly limits the possibility of crop breeding (Ji et al 2007b;Lapidot and Friedmann 2002). Frequently, TYLCD resistance is under complex genetic control that is difficult to manage in breeding programs (Lapidot and Friedman 2002).…”

mentioning

confidence: 98%

Resistance toTomato yellow leaf curl virusAccumulation in the Tomato Wild RelativeSolanum habrochaitesAssociated with the C4 Viral Protein

Tomás

Cañizares²,

Abad³

et al. 2011

MPMI

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Tomato yellow leaf curl disease (TYLCD) is a severe threat to tomato crops worldwide and is caused by Tomato yellow leaf curl virus (TYLCV) and several other begomoviruses (genus Begomovirus, family Geminiviridae). Host plant resistance is the best TYLCD control method but limited sources of resistance are available. In this study, two Solanum habrochaites TYLCD-resistance sources, EELM-388 and EELM-889, were found after a wide germplasm screening and were further characterized. A consistent resistance to the widely distributed strain TYLCV-IL was observed when plants were inoculated by Bemisia tabaci or by agroinoculation using an infectious clone, with no symptoms or virus accumulation observed in inoculated plants. Moreover, the resistance was effective under field conditions with high TYLCD pressure. Two independent loci, one dominant and one recessive, were associated with EELM-889 resistance. The study shows these loci to be distinct from that of the resistance gene (Ty-1 gene) commonly deployed in commercial tomato cultivars. Therefore, both kinds of resistance could be combined to provide improved resistance to TYLCD. Four additional TYLCD-associated viruses were challenged, showing that the resistance always prevented symptom expression, although systemic infection could occur in some cases. By using chimeric and mutant expression constructs, the C4 protein was shown to be associated with the ability to result in effective systemic infection.

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“…Independently of them being allelic or not to Ty-1 and Ty-3, their close location in a region in which recombination is inhibited would greatly reduce the possibility to combine them in cis (Verlaan et al 2011). Differences have been reported regarding the dominance or the range of resistance to begomovirus for Ty-1 and Ty-3 (Ji et al 2007a). Further work will be necessary to investigate the range of resistance conferred by the loci identified in this work.…”

Section: Discussionmentioning

confidence: 76%

“…Variable levels of resistance have been identified in different accession belonging to S. galapagense S. Darwin & Peralta, S. pimpinellifolium L., S. peruvianum L., S. habrochaites S. Knapp & D.M. Spooner and S. chilense (Dunal) Reiche (reviewed in Ji et al 2007a). Inheritance of TYLCD resistance depends on the accession considered, ranging from dominant monogenic to quantitative recessive.…”

Section: Introductionmentioning

confidence: 98%

Genetic control and mapping of Solanum chilense LA1932, LA1960 and LA1971-derived resistance to Tomato yellow leaf curl disease

2012

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Tomato yellow leaf curl disease (TYLCD) is caused by a complex of begomovirus. Breeding for resistance to this disease has mainly been based on Ty-1 gene, derived from Solanum chilense LA1969. Commercial varieties available to date still develop symptoms and suffer yield losses with high inoculum pressure and early infections. It is of interest to incorporate in breeding programs resistance from the different available sources. Lines with resistance to TYLCD derived from S. chilense accessions LA1932, LA1960 and LA1971 were previously developed. The objectives of this work were to study the genetic control of the resistance derived from these accessions and to map the resistance loci. Response to viral infection was assayed in segregating generations derived from these sources. Results obtained were compatible with a monogenic control of resistance. A total of 94 markers were used to locate the S. chilense introgressions in each of the lines. Only the presence of a large introgression in chromosome 6 was common to all lines. Analysis of recombinants allowed localizing the resistance loci in an interval of approximately 25 cM, also common to all five families. This interval includes the region to which two previously S. chilense-derived TYLCD resistance loci have been mapped, the Ty-1/Ty-3 region. This is the first report of LA1960 and LA1971-derived TYLCV resistance loci to be located on chromosome 6. Further work will be done to fine map the loci found in the present work, in order to determine if they are indeed located in the Ty-1/Ty-3 region.

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Sources of Resistance, Inheritance, and Location of Genetic Loci Conferring Resistance to Members of the Tomato-Infecting Begomoviruses

Cited by 91 publications

References 49 publications

Begomovirus disease complex: emerging threat to vegetable production systems of West and Central Africa

Begomovirus disease complex: emerging threat to vegetable production systems of West and Central Africa

Resistance toTomato yellow leaf curl virusAccumulation in the Tomato Wild RelativeSolanum habrochaitesAssociated with the C4 Viral Protein

Genetic control and mapping of Solanum chilense LA1932, LA1960 and LA1971-derived resistance to Tomato yellow leaf curl disease

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