Identification and Evaluation of Diplogyny in Clementine (Citrus Clementina) for Use in Breeding

Luro, François; Maddy, F.; Jacquemond, Camille; Froelicher, Yann; Morillón, Raphaël; Rist, Delphine; Ollitrault, Patrick

doi:10.17660/actahortic.2004.663.152

Cited by 46 publications

(74 citation statements)

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“…Frequency of female 2n gametes ranges from rates below 1 % to over 20 % Soost 1971, 1973;Geraci et al 1975;Soost 1987;Iwamasa et al 1988;Aleza et al 2010), probably due to the abortion of the first meiotic division (Chen et al 2008c) or second meiotic division (Luro et al 2004) in the megaspore. Tetraploidization seems also to occur frequently in apomictic citrus genotypes.…”

Section: New Insight On Polyploid Citrus Genome Expressionmentioning

confidence: 99%

“…SSR markers have been included in citrus genetic maps (Chen et al 2008a;Lyon et al 2007;Luro et al 2007;Ollitrault et al 2008b;. In addition to genetic mapping, SSRs were used for: the analysis of genetic diversity Corazza-Nunes et al 2002;Barkley et al 2006), discriminating zygotic and nucellar seedlings (Ruiz et al 2000;Oliveira et al 2002;Rao et al 2007), control of the origin of plants obtained by induced gynogenesis (Froelicher et al 2007;Aleza et al 2009), molecular characterization of triploid cultivars (Aleza et al 2010) or somatic hybrids Bassene et al 2009a) and the analysis of the origin of 2n gametes (Luro et al 2004;Chen et al 2008c;Cuenca et al 2009;Ferrante et al 2010).…”

Section: Nuclear Marker Developmentmentioning

confidence: 99%

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Citrus genomics

Gmitter

Chen

Machado³

et al. 2012

Tree Genetics & Genomes

103

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Citrus fruits (sweet orange, mandarin, pummelo, grapefruit, lemon, lime and assorted hybrids) are among the most widely grown and economically important fruit tree crops in the world. As fresh fruit, they are an important and nutrient dense food source for human diets; as processed juice products, primarily sweet orange juice, they represent a globally traded commodity. To support genetic improvement efforts for this important crop, the international citrus genetics community has collaborated with international sequencing centers in the development of freely available genomic resources, some of which are described herein. Most notable, two full-length annotated genome assemblies have been produced and made available to the global research community. The first genome, based exclusively on Sanger sequencing, is from a haploid plant derived from 'Clementine' mandarin, to serve as the reference genome for citrus. A second genome assembly was produced from the sweet orange clone 'Ridge Pineapple', this was done primarily with 454 technology. Extensive EST datasets and a number of microarray platforms for exploring the transcriptomic responses of citrus species and hybrids to a wide range of conditions have been shared, to support exploitation and utilization of genome sequence information. As many researchers in the citrus genomics community are also actively engaged in genetic improvement programs, there has been a natural integration of improvement efforts with the rapidly evolving genomic tools. Examples described below include work designed to better understand the control of gene expression in citrus polyploids, which are being used in development of seedless triploid selections or as rootstocks; unraveling the molecular mechanisms of host-pathogen interactions to devise novel genetic strategies to overcome a multitude of devastating diseases that currently threaten citrus production globally; and the mining of SSR and SNP markers for linkage studies to enable marker-assisted parental selection and breeding strategies, illustrated bywork on two citrus traits, nucellar embryony and juvenility, which significantly impact breeding approaches. Citrus genome resources are available through publicly available web portals, through the USDOEJGI (phytozome.net) and Tree Fruit Genome Database Resources (tfGDR, citrusgenomedb.org). Work is continuing to expand and improve the citrus genome sequence resources and tools, to enable application of sequence-derived knowledge in improving citrus plants and to managing better their interactions with biotic and abiotic factors. (Résumé d'auteur

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Section: New Insight On Polyploid Citrus Genome Expressionmentioning

confidence: 99%

Section: Nuclear Marker Developmentmentioning

confidence: 99%

Citrus genomics

Gmitter

Chen

Machado³

et al. 2012

Tree Genetics & Genomes

103

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“…They are often helpful for phylogenetic studies (Luro et al, 2001;Garcia-Lor et al, 2012;Garcia-Lor et al, 2013b), somatic hybrids characterization (Aleza et al, 2016b), discrimination between zygotic and nucellar seedlings (Ruiz et al, 2000;Ruiz and Asins, 2003), control of the origin of plants obtained by induced gynogenesis (Froelicher et al, 2007), molecular characterization of triploid cultivars (Cuenca et al, 2010), the analysis of the origin of unreduced gametes (Luro et al, 2004;Chen et al, 2008;Cuenca et al, 2011;Aleza et al, 2016a), mapping , and marker assisted selection in breeding . The homoplasic phenomena (identical allelic size arising from independent genetic events) observed by Barkley et al (2009) can limit the use of those markers for phylogenetic studies.…”

Section: Vi44 Genetic and Genomic Resourcesmentioning

confidence: 99%

“…However, the small and indistinguishable citrus chromosomes and the small frequency of unreduced gametes represented a major constrain for these techniques in citrus (Barba Gonzalez et al, 2005;. In contrast, molecular marker analysis have been proved as a very helpful tool to estimate the heterozygosity restitution in the unreduced gametes in polyploid progenies and paves the way for the identification of mechanism underlying 2n gametes formation (Barone et al, 1995;Vorsa and Rowland, 1997;Bastiaanssen et al, 1998;Barcaccia et al, 2003;Luro et al, 2004;Chen et al, 2008;Hayashi et al, 2009). …”

Section: Vii1 Unreduced Gametesmentioning

confidence: 99%

“…Molecular marker analysis is used for the estimation of parental PHR through unreduced gametes in polyploid progenies (Barone et al, 1995;Vorsa and Rowland, 1997;Luro et al, 2004;Bastiaanssen et al, 1998;Cuenca et al, 2011;2015). Most of the previously developed methodologies are based on the genetic analysis of a high number of random molecular markers.…”

Section: Vii1 Unreduced Gametesmentioning

confidence: 99%

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Genetic Structure of Diploid Gametes for the Production of Triploid Citrus Hybrids

Rouiss¹

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Citrus

Ollitrault¹,

Navarro²

2011

Fruit Breeding

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Citrus is the most extensively produced tree fruit crop in the world. There are two clearly differentiated markets: the fresh fruit and the processed juice market. Citrus species are essentially diploids (2n = 2x = 18) and were domesticated in Southeast Asia several thousand years ago and then spread throughout the world. Most of the cultivated citrus species are part of the Citrus genus containing, depending on the taxonomist, between 16 and 156 species. The relative complexity of these classifications results from the conjunction of a broad morphological diversity, total sexual interspecific compatibility within the genus and apomixis. There are four basic taxa on the basis of morphological descriptors and molecular data (C. maxima (Burm.) Merr., the pummelos; C. medica L., the citrons, C. reticulata Blanco, the andarins, and C. micrantha Wester). The other cultivated species (C. aurantium L., the sour orange; C. sinensis (L.) Osbeck, the sweet orange; C. paradisi Macf, the grapefruit; C. limon (L.) Burm. f., the lemon, and C. aurantifolia (Christm.) Swingle, the lime) appeared by recombination among the basic taxa. Most of the citrus scion cultivars result from the selection of spontaneous bud mutations identified in production orchards. Today several projects of ploidy manipulation are developed in different countries to select seedless triploid mandarins. Fruit quality (size, color, easy-peeling), seedlessness, and the extension of the harvest season are the main selection objectives for fresh market cultivars. The majority of the rootstocks used for propagation are original species or ancient natural hybrids. However, intergeneric hybrids (Citrus × Poncirus) such as citranges, citrumelos, and citrandarins have an increasing importance. The first rootstock breeding objective is adaptation to soil conditions and soil pathogens. The most widespread needs would be tolerance to CTV. Biotechnology is strongly integrated into breeding and propagation schemes. Shoot tip grafting is widely used for sanitation of the mother plants in certification propagation schemes. Somatic hybridization is an effective tool used for scion and rootstock breeding. Functional genomics studies ESTs, microarray platforms, and a full genome sequence are available. Efficient and reliable transformation systems for several economically important citrus species exist. (Résumé d'auteur

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Identification and Evaluation of Diplogyny in Clementine (Citrus Clementina) for Use in Breeding

Cited by 46 publications

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Citrus genomics

Citrus genomics

Genetic Structure of Diploid Gametes for the Production of Triploid Citrus Hybrids

Citrus

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