Estudios cromosómicos en Turnera y Piriqueta (Turneraceae)

Fernández, Amparo Ygual

doi:10.30972/bon.611501

Cited by 53 publications

(56 citation statements)

References 3 publications

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“…var. coerulea , all of which occur at both diploid and autotetraploid levels (Fernández, 1987; Shore, 1991a,b; Truyens et al ., 2005) while distylous Turnera fernandezii is an auto‐octaploid (Fernández, 1987; Arbo, 2005; Table 1). Five subspecies occur within the T. sidoides L. complex (series Leiocarpae , x = 7).…”

Section: Polyploidy and Breeding Systemsmentioning

confidence: 99%

“…Two of the subspecies possess only distylous populations, while the other three subspecies possess both distylous and homostylous populations (Table 1). Ploidy levels range from diploid through octaploid, and all the polyploids appear to be autopolyploids (Arbo, 1985; Fernández, 1987; Solís Neffa & Fernández, 2000, 2002).…”

Section: Polyploidy and Breeding Systemsmentioning

confidence: 99%

“…Exceptions to this pattern of autopolyploid distylous species occur for tetraploid Turnera grandidentata (Urb.) Arbo, which is a segmental allotetraploid (Fernández, 1987; Fernández & Arbo, 1990, 1993b), and Turnera chamaedrifolia Cambess. which is a ‘diploid’ having a base chromosome number of x = 13, as opposed to x = 5 or x = 7 for all other Turnera species (Fernández, 1987).…”

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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Section: Polyploidy and Breeding Systemsmentioning

confidence: 99%

Section: Polyploidy and Breeding Systemsmentioning

confidence: 99%

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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“…In addition to the morphological and geographical variation, T. sidoides shows different ploidy levels based on x = 7 (Fernández, 1987; Solís Neffa & Fernández, 2001). Diploid (2 n = 2 x = 14), tetraploid (2 n = 4 x = 28) and hexaploid (2 n = 6 x = 42) cytotypes occur in each of subspecies carnea , holosericea , pinnatifida and integrifolia .…”

Section: Introductionmentioning

confidence: 99%

Chloroplast DNA variation in the Turnera sidoides L. complex (Turneraceae): biogeographical implications

Speranza

Seijo

Grela

et al. 2006

Journal of Biogeography

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Geological processes coupled with Quaternary climatic episodes are considered by many to have played a major role in shaping current plant distributions and evolution. A great amount is known about the biogeographical effects and stimulus for speciation and intraspecific differentiation of Quaternary climatic changes in the temperate regions of the ABSTRACT Aim To analyse the current geographical structure of chloroplast DNA variation in the Turnera sidoides L. complex in order to establish historical biogeographical hypotheses for the mid-latitude South American lowlands. During the Quaternary, the climate shifted from tropical humid to cold dry, and the vegetation cover has not been stable. The consequences of these processes on the current distribution of the vegetation of this area have received very little attention.Location The mid-latitude South American lowlands extend between c. 20 and 40°S and include Uruguay, northern, central and eastern Argentina, southern Brazil, and parts of southern Paraguay and Bolivia. They are surrounded by higher-elevation systems.Methods Turnera sidoides is a well-studied polyploid complex of perennial rhizomatous herbs occurring throughout the area of interest. We analysed 321 individuals from 79 populations of the five recognized subspecies. We also included progenies from artificial crosses in order to analyse chloroplast inheritance. After screening sequences for four non-coding chloroplast DNA regions, the trnL-trnF spacer was selected to characterize the collection.Results Three haplotypes can be easily identified, with each differing from the others in two independent characters. A clear geographic structure is revealed when haplotypes are plotted for the complex as a whole regardless of subspecies and cytotype. Three distinct regions can be identified. Main conclusionsWe propose three putative refugial areas for the Turnera sidoides complex, which are associated with the orographical systems of the region. Ravines and slopes in the Haedo Cuchilla system in northern Uruguay, the elevations of the western side of the area in Argentina, and the eastern Serranías system in south-eastern Uruguay may each have served as refugia in which the A, B and C haplotypes became fixed during the drier climatic phases. Biogeographical patterns in the area covered by T. sidoides, particularly east of the Uruguay River, have not previously been analysed from a historical perspective.

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“…We have previously explored the genetic basis of breeding-system variation, the origin of self-compatibility from distyly, and the potential for fertility assurance and its floral correlates (Shore andBarrett 1985, 1990; Barrett and Shore 1987). Here we focus on Jamaican populations of T. ulmifolia L., a selfcompatible, hexaploid species (Barrett and Shore 1987;Fernandez 1987) probably derived from an obligate outcrossing (distylous) ancestor (Shore and Barrett 1985;Barrett and Shore 1987).…”

mentioning

confidence: 99%

Floral Correlates and Fitness Consequences of Mating-System Variation in Turnera ulmifolia

Belaoussoff¹,

Shore²

1995

Evolution

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Outcrossing rates varied from 0% to 69% among Jamaican populations of Turnera ulmifolia. A correlation between increasing herkogamy and outcrossing rate occurred among populations. Predictions from sex‐allocation theory were tested by estimating allocation to reproductive functions. Significant differences in allocation patterns occurred among populations, but they were not correlated with outcrossing rates. The fitness consequences of inbreeding were assessed in high‐ and low‐density greenhouse experiments for nine populations with variable outcrossing rates. No evidence for inbreeding depression occurred in early portions of the life history, but multiplicative fitness functions provide evidence for inbreeding depression. We tested the prediction that selfing populations have lower levels of inbreeding depression than outcrossing populations but found no significant correlation.

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Estudios cromosómicos en Turnera y Piriqueta (Turneraceae)

Cited by 53 publications

References 3 publications

Breeding system variation, genetics and evolution in the Turneraceae

Breeding system variation, genetics and evolution in the Turneraceae

Chloroplast DNA variation in the Turnera sidoides L. complex (Turneraceae): biogeographical implications

Floral Correlates and Fitness Consequences of Mating-System Variation in Turnera ulmifolia

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