Allozyme Variation in the Cultivated Tomato and Closely Related Species

Rick, Charles M.; Fobes, Jon F.

doi:10.2307/2484764

Cited by 127 publications

(75 citation statements)

References 7 publications

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“…Unlike these green-fruited species, the closely related redfruited, sympatric S. pimpinellifolium yielded highly fertile hybrids and showed extensive evidence of crosshybridization. The one additional near-relative and only other color-fruited tomato species, Lycopersicon cheesma-niae (now classified into species Solanum cheesmaniae (L Riley) Fosberg and Solanum galapagense S. Darwin and Peralta), evolved in geographical isolation so could not form interspecific hybrids in nature (Rick and Fobes, 1975). Studies of geographical distributions of various marker alleles further supported the hypothesis of frequent hybridization between S. lycopersicum and S. pimpinellifolium (Rick, 1971;Rick and Fobes, 1975).…”

Section: Diversity Patternsmentioning

confidence: 94%

“…All three accessions showed at least a low frequency of slightly or moderately exserted stigmas when grown in the field (JA Labate et al, manuscript in preparation). Diverse populations of S. lycopersicum from Ecuador and Peru were hypothesized to have hybridized with sympatric S. pimpinellifolium based on allozyme evidence and lack of reproductive barriers (Rick and Fobes, 1975).…”

Section: Diversity Estimatesmentioning

confidence: 99%

“…Although a Mexican versus South American origin of domestication for tomato remains unclear (Peralta and Spooner, 2007), it is assumed that the crop went through multiple bottlenecks during domestication and subsequent intercontinental dispersal via explorers of the New World. Two postdomestication founder events, first from South America to Europe, then from Europe to the United States, occurred relatively recently; prior bottlenecks have been hypothesized (Rick and Fobes, 1975). Recovering alleles that were lost as a consequence of small effective population size is highly feasible using genebank collections.…”

Section: Introductionmentioning

confidence: 99%

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Multilocus sequence data reveal extensive departures from equilibrium in domesticated tomato (Solanum lycopersicum L.)

Labate¹,

Robertson²,

Baldo³

2009

Heredity

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Limited genetic variation has been observed within tomato (Solanum lycopersicum L.), although no studies have extensively surveyed single nucleotide polymorphism (SNP) diversity among tomato landraces. We estimated intraspecific DNA sequence variation by analyzing 50 gene fragments (23.2 kb) per plant in a 31 plant diversity panel. The majority of loci (80%) were polymorphic with the minor allele at a frequency of 10% or less for most (141 of 155) SNPs. Mean diversity as estimated by y and p was approximately 1.5 SNPs per kb. Significant linkage disequilibrium was observed between 19% of locus pairs, and withinlocus population recombination estimates were negligible. We also sequenced 43 gene fragments from wild tomato Solanum arcanum Peralta as an outgroup. Various statistical tests rejected a neutral equilibrium model of molecular evolution at 10 of 50 loci. Rare, highly diverged alleles were observed, involving at least seven tomato lines and five loci. Some of these may represent introgressions that originated both from natural hybridization with Solanum pimpinellifolium L. and from crosses with S. pimpinellifolium and additional wild relatives for crop improvement. The former was reported from classical field studies carried out by CM Rick; the latter has been extensively documented in the crop, particularly for transfer of disease resistance alleles. Extensive introgression and frequent bottlenecks within S. lycopersicum will pose a challenge to reconstructing the genetic bases of domestication and selection using methods that rely on patterns of molecular polymorphism.

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Section: Diversity Patternsmentioning

confidence: 94%

Section: Diversity Estimatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multilocus sequence data reveal extensive departures from equilibrium in domesticated tomato (Solanum lycopersicum L.)

Labate¹,

Robertson²,

Baldo³

2009

Heredity

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Section: Discussionmentioning

confidence: 99%

“…Of them, the botanical variety cerasifrome is considered as ancestry of the tomato and introgression phenomena between L. pimpinellifolium and the tomato have been reported. The theories regarding the domestication of the tomato are not unique, being the theories of Jenkins (1948) and Rick (1958) opposed to most recent ones of Rick and Fobes (1975) and Rick and Holle (1990).In order to contribute to the clarification of these aspects, in the present Doctoral Thesis the following objectives are proposed:1.-Study of the morphologic and molecular variability of these species 2.-Elucidation of the phylogenetic relations between the species of the Eulycopersicon subgenus.3.-Establishment of strategies of conservation of these species and in special of Lycopersicon pimpinellifolium, for which important differences in the degree of alogamy have been described.4.-Beginning of the establishment of a core collection in the collection of accessions of L. pimpinellifolium of the COMAV.A total of 165 accessions of the Lycopersicon genus have been studied, belonging 48 of them to Lycopersicon esculentun var. cerasiforme, 86 to L. pimpinellifolium and 31 to L. esculentum.…”

mentioning

confidence: 99%

Análisis de la variabilidad en las especies del subgénero Eulycopersicon más relacionadas con el tomate cultivado.

Domingos¹

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Queda prohibida la reproducción, distribución, comercialización, transformación, y en general, cualquier otra forma de explotación, por cualquier procedimiento, de todo o parte de los contenidos de esta obra sin autorización expresa y por escrito de sus autores. Impreso en España RESUMENEl Centro de Conservación y Mejora de la Agrodiversidad (COMAV) de la Universidad Politécnica de Valencia alberga una de las colecciones más importantes de entradas del género Lycopersicon, incluyendo el tomate cultivado (Lycopersicon esculentum, L. esculentum var. cerasiforme) y sus especies silvestres relacionadas (L. cheesmanii, L. pimpinellifolium, L. hirsutum, L. pennellii, L. chmilewskii, L. parviflorum L. peruvianum y L. chilense).A pesar de ser el tomate una de las hortalizas de mayor importancia económica a nivel mundial, siguen existiendo ambigüedades en su taxonomía así como dudas sobre su domesticación. De hecho, se observan en muchas ocasiones formas intermedias entre el tomate cultivado y la variedad botánica cerasiforme, así como entre la forma cerasiforme y la especie L. pimpinellifolium. Igualmente se han detectado formas intermedias entre L. pimpinellifolium y la especie L. cheesmanii, endémica de las islas Galápagos. Estas especies constituyen el subgénero Eulycopersicon, interfértiles con el tomate cultivado. De ellas, la variedad botánica cerasifrome está considerada como el ancestro del tomate y se ha comprobado la existencia de fenómenos de introgresión entre L. pimpinellifolium y el tomate. Las teorías sobre la domesticación del tomate no son únicas, oponiéndose las teorías de Jenkins (1948) Para contribuir a la clarificación de estos aspectos, en la presente Tesis Doctoral se persiguen los siguientes objetivos:1.-Estudio de la variabilidad morfológica y molecular de estas especies 2.-Esclarecimiento de las relaciones filogenéticos entre las especies del subgénero Eulycopersicon.3.-Establecimiento de estrategias de conservación de estas especies y en especial de Lycopersicon pimpinellifolium, para la que se han descrito diferencias importantes en el grado de alogamia.4.-Inicio de la formación de una colección nuclear en la colección de entradas de L. pimpinellifolium del COMAV.Se han ensayado un total de 165 entradas del género Lycopersicon, perteneciendo 48 de ellas a Lycopersicon esculentun var. cerasiforme, 86 a L. pimpinellifolium y 31 a L. esculentum, en las campañas de otoño-invierno durante los años 2000-01 y 2001-02. Para la caracterización morfológica de las plantas se han seguido los descriptores de tomate publicados por el IPGRI. La caracterización molecular se realizó mediante marcadores AFLP. Los datos se han analizado mediante análisis multivariante, realizando Análisis de Componentes Principales y Análisis Cluster. En el análisis de datos cuantitativos se han calculado las distancias euclídeas y se ha empleado el método de agrupamiento UPGMA. La robustez y nivel de fiabilidad se ha medido mediante la técnica de remuestreo bootstrap. Se realizó un análisis de la Varianza (ANOVA) y posterio...

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Genomics‐Assisted Breeding for Tomato Fruit Quality in the Next‐Generation Omics Age

Kinkade¹,

Foolad²

2013

Translational Genomics for Crop Breeding

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Allozyme Variation in the Cultivated Tomato and Closely Related Species

Cited by 127 publications

References 7 publications

Multilocus sequence data reveal extensive departures from equilibrium in domesticated tomato (Solanum lycopersicum L.)

Multilocus sequence data reveal extensive departures from equilibrium in domesticated tomato (Solanum lycopersicum L.)

Análisis de la variabilidad en las especies del subgénero Eulycopersicon más relacionadas con el tomate cultivado.

Genomics‐Assisted Breeding for Tomato Fruit Quality in the Next‐Generation Omics Age

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