Relaciones genómicas entre cuatro especies diploides de Turnera con flores amarillas (serie Canaligerae)

Fernández, Amparo Ygual; Arbo, María Mercedes

doi:10.30972/bon.62-31507

Cited by 20 publications

(36 citation statements)

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“…Heavy lines indicate the evolution of homostyly. their genomes have been given different designations based upon karyotypic differences (Fernández and Arbo, 1989Arbo, , 1990Arbo, , 1993aArbo, , b, 1996. The white/blue-flowered species have the ''C'' genome, while the yellow-flowered species possess variants of the ''A'' genome.…”

Section: Discussionmentioning

confidence: 99%

“…The only cross reported for this species was between distylous T. grandiflora and T. candida. A resulting hybrid was long-styled, but no information on compatibility relationships was obtained (Fernández and Arbo, 1996). It is not clear whether T. candida has had an origin comparable with the putative recombinant origins of homostyly observed among the yellow-flowered polyploid species (Barrett and Shore, 1987;Tamari et al, 2001).…”

Section: Evolution Of Base Chromosome Number-three Different Base Chrmentioning

confidence: 93%

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Phylogenetic relationships, chromosome and breeding system evolution inTurnera(Turneraceae): inferences from its sequence data

Truyens

Arbo

Shore

2005

American J of Botany

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Turnera provides a useful system for exploring two significant evolutionary phenomena-shifts in breeding system (distyly vs. homostyly) and the evolution of polyploids. To explore these, the first molecular phylogeny of Turnera was constructed using sequences of the internal transcribed spacer region (ITS) of nuclear ribosomal DNA for 37 taxa. We attempted to resolve the origins of allopolyploid species using single-strand conformation polymorphism and sequencing of homeologous copies of ITS. Two allohexaploid species possessed putative ITS homeologues (T. velutina and T. orientalis). A phylogenetic analysis to identify progenitors contributing to the origins of these polyploids was unsuccessful, possibly as a result of concerted evolution of ITS. Breeding system evolution was mapped onto the phylogeny assuming distyly to be ancestral in Turnera. Self-compatible homostyly appears to have arisen independently at least three times in Turnera; however, we were not able to determine whether there have been independent origins of homostyly among hexaploid species in series Turnera. Our phylogenetic analyses suggest that series Turnera is monophyletic. Neither series Microphyllae nor Anomalae, however, appear to be monophyletic. Future taxonomic revisions may require new circumscriptions of these latter series.

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Section: Discussionmentioning

confidence: 99%

Section: Evolution Of Base Chromosome Number-three Different Base Chrmentioning

confidence: 93%

Phylogenetic relationships, chromosome and breeding system evolution inTurnera(Turneraceae): inferences from its sequence data

Truyens

Arbo

Shore

2005

American J of Botany

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“…The polyploids all appear to be allopolyploids based upon examination of meiosis in these species, although Fernández & Arbo (2000b) have suggested that octaploids Turnera aurelii and Turnera cuneiformis , and hexaploids Turnera orientalis , T. ulmifolia var. ulmifolia and T. velutina may be segmental allopolyploids based upon studies of meiosis in hybrids (Fernández & Arbo, 1993a, 2000a,b; Fernández, 1997). Turnera candida Arbo is the only known self‐compatible diploid homostylous species in this series (Fernández & Arbo, 1996).…”

Section: Polyploidy and Breeding Systemsmentioning

confidence: 99%

“…ulmifolia and T. velutina may be segmental allopolyploids based upon studies of meiosis in hybrids (Fernández & Arbo, 1993a, 2000a,b; Fernández, 1997). Turnera candida Arbo is the only known self‐compatible diploid homostylous species in this series (Fernández & Arbo, 1996). The nature of homostyly is unknown in this species since compatibility relationships (Fig.…”

Section: Polyploidy and Breeding Systemsmentioning

confidence: 99%

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Breeding system variation, genetics and evolution in the Turneraceae

2006

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We review the genetics and evolution of breeding systems in the Turneraceae. Distyly occurs in seven of 10 genera and 81% of species. The remaining species are homostylous. Polyploid evolution has been significant in Turnera . Approximately 60% of species are polyploid ranging from diploid through decaploid. No relationship between breeding system and polyploidy is evident. The genetics of distyly involves a one-locus two-allele system ( S and s). Evidence from crosses with homostylous species and mutants is consistent with the possibility that a ' Primula -type' supergene underlies distyly but does not prove this to be the case. A polygalacturonase, and an α -dioxygenase specific to the transmitting tissue of short-styled plants both exhibit morph-limited expression in concert with predictions from an evolutionary model. The function of the proteins in distyly, if any, is unknown. We have begun constructing a fine-scale genetic map of Turnera . Two genetic markers lie within 0.2 c M of the distyly locus. This should provide a starting point for positional cloning of the distyly locus and reveal the genetic architecture and molecular basis of distyly.New Phytologist (2006) 171: 539-551

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Nuclear DNA content in the polyploid complex Turnera ulmifolia (Turnera L., Passifloraceae)

López

Panseri

Poggio³

et al. 2011

Plant Syst Evol

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Turnera ulmifolia constitutes a well-studied polyploid complex with allo-and autopolyploid species ranging from 2 to 8x. Flow cytometry was used to determine nuclear DNA content, and to estimate 2C-and 1Cxvalues with the aim of analysing the genome size in Turnera in terms of polyploid speciation. The 2C-value and 1Cx-value were evaluated in 12 species of the T. ulmifolia complex. Nuclear DNA content was estimated by flow cytometry of nuclei stained with propidium iodide. The 2C DNA content ranged from 1.38 to 1.83 pg in diploids, from 2.67 to 3.96 pg in tetraploids, from 2.73 to 4.31 pg in hexaploids, and from 3.53 to 5.90 pg in octoploids. The 1Cx-value ranged from 0.44 to 0.99 pg. The Turnera ulmifolia complex showed an increase in total DNA content in the ploidy level, but not in the expected proportion. The general tendency indicated a decrease in the 1Cx-value with increasing chromosome number, with T. grandidentata 4x being an outstanding exception. The 1Cx-values in the allooctoploids T. aurelii and T. cuneiformis differed by 1.6-fold from each other, probably as a result of different evolutionary histories following divergence from the last common ancestor.

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Relaciones genómicas entre cuatro especies diploides de Turnera con flores amarillas (serie Canaligerae)

Cited by 20 publications

References 2 publications

Phylogenetic relationships, chromosome and breeding system evolution inTurnera(Turneraceae): inferences from its sequence data

Phylogenetic relationships, chromosome and breeding system evolution inTurnera(Turneraceae): inferences from its sequence data

Breeding system variation, genetics and evolution in the Turneraceae

Nuclear DNA content in the polyploid complex Turnera ulmifolia (Turnera L., Passifloraceae)

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