Análisis Citogeográfico En Turnera Krapovickasii (Passifloraceae).

Lazaroff, Yanina; Moreno, Ercilia María Sara; Fernández, Amparo Ygual; Neffa, Viviana G. Solís

doi:10.31055/1851.2372.v51.n1.14485

Cited by 5 publications

(4 citation statements)

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“…Although several studies show niche divergence between allopolyploids and at least one of their progenitors (Glennon et al., , ; Theodoridis et al., ; Harbert et al., ; Han et al., ; López‐Alvarez et al., ; Marchant et al., ), other studies show allopolyploid lineages have intermediate or non‐divergent ecological niches (Oberprieler et al., ; Glennon et al., ; Harbert et al., ; Boucher et al., ; Marchant et al., ; Casazza et al., ). For autopolyploids, some studies have found significant ecological segregation between polyploids and their ancestors (Schönswetter et al., ; Stahlberg, ; Thompson et al., ; Hülber et al., ; Zozomová‐Lihová et al., ; Lazaroff et al., ; Mandák et al., ; Mered'a et al., ; Sonnleitner et al., ; Visger et al., ), and yet other studies find no ecological divergence between cytotypes (Godsoe et al., ; Hanzl et al., ). Most of the reported studies are limited to evaluating if niches are conserved but do not investigate how the niches of the two cytotypes differ in aspects such as optima and breadths (but see Kirchheimer et al., ).…”

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Autopolyploid lineage shows climatic niche expansion but not divergence inArabidopsis arenosa

Molina-Henao

Hopkins

2019

American J of Botany

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Premise of the Study Successful establishment of neopolyploids, and therefore polyploid speciation, is thought to be contingent on environmental niche shifts from their progenitors. We explore this niche shift hypothesis in the obligate outcrosser Arabidopsis arenosa complex, which includes diploid and recently formed autotetraploid populations. Methods To characterize the climatic niches for both cytotypes in Arabidopsis arenosa, we first gathered climatic data from localities with known ploidy types. We then estimated the climatic niches for diploids and autotetraploids and calculated niche overlap. Using this niche overlap statistic, we tested for niche equivalency and similarity. We explored differences in niches by estimating and comparing niche optimum and breadth and then calculated indices of niche expansion and unfilling. Key Results Climatic niche overlap between diploids and autotetraploids is substantial. Although the two niche models are not significantly divergent, they are not identical as they differ in both optimum and breadth along two environmental gradients. Autotetraploids fill nearly the entire niche space of diploids and have expanded into novel environments. Conclusions We find climatic niche expansion but not divergence, together with a moderate change in the niche optimum, in the autotetraploid lineage of Arabidopsis arenosa. These results indicate that the climatic niche shift hypothesis alone cannot explain the coexistence of tetraploid and diploid cytotypes.

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Autopolyploid lineage shows climatic niche expansion but not divergence inArabidopsis arenosa

Molina-Henao

Hopkins

2019

American J of Botany

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“…En T. krapovickasii y T. scabra, los diploides y tetraploides están segregados espacialmente (Shore & Barrett, 1986;Barrett & Shore, 1987;Lazaroff et al, 2016), aunque también se detectaron algunos individuos triploides en las poblaciones naturales diploides de T. krapovickasii (Lazaroff et al, 2016). Dicho hallazgo, sumado a la presencia de triploides en la progenie de los cruzamientos experimentales entre diploides y tetraploides de T. krapovickasii y T. subulata detectados en este trabajo, evidencian que el bloqueo triploide también puede ser superado en estas especies.…”

Section: Discussionunclassified

“…poseen citotipo diploide 2n= 2x =10 y autotetraploide 2n= 4x =20 (Fernández, 1987;Arbo, 2005;Shore et al, 2006). Los citotipos de estas especies están segregados espacialmente, aunque se han detectado algunas poblaciones mixtas (Shore & Barrett, 1986;Barrett & Shore, 1987;Lazaroff et al, 2016). En dichas poblaciones, el grado de aislamiento reproductivo entre diploides y tetraploides podría tener un importante papel en la coexistencia entre los citotipos (Harlan & deWet, 1975;de Wet, 1980;Felber & Bever, 1997;Ramsey & Schemske, 1998;Burton & Husband, 2000).…”

Section: Introductionunclassified

Estudios citogenéticos en híbridos triploides y tetraploides de Turnera krapovickasii, T. scabra y T. subulata (Passifloraceae, Turneroideae).

Fernández¹,

Fernández²,

Kovalsky³

et al. 2017

Bol. Soc. Argent. Bot.

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Summary: Cytogenetic studies in triploid and tetraploid hybrids of Turnera krapovickasii, T. scabra and T. subulata (Passifloraceae, Turneroideae). In order to investigate the genomic relationships among species of series Turnera (x= 5), a controlled crossing program was performed and yielded numerous hybrids. Among the yellow flowered species of series Turnera, T. krapovickasii, T. scabra and T. subulata have diploid and autotetraploid cytotypes. So far, the degree of reproductive isolation between diploids and autotetraploids, and the degree of genomic affinity at tetraploid level are unknown. In this study, we present the results of the cytogenetic analysis of triploid (2n=3x=15) intraspecific hybrids of T. krapovickasii and T. scabra and tetraploid (2n=4x=20) (2n=4x=20) T. krapovickasii × T. scabra and T. subulata × T. scabra hybrids. In the triploid hybrids we found cells with 1 to 5 trivalents and the pollen viability was 11.4% -15.2%. In the tetraploid hybrids we found cells with 1 to 5 quadrivalents and the pollen viability was 76% -87.97%. The results of this work revealed that the reproductive isolation between diploids and tetraploids is incomplete, and that the triploid hybrids are not completely steriles. Likewise, the cytogenetic analysis of the interspecific hybrids evidenced that the genomes of T. krapovickasii, T. scabra and T. subulata display more affinity at tetraploid level than at diploid level. Key words: Turnera, meiosis, genomic relationships, triploid, tetraploid.Resumen: A fin de investigar las relaciones genómicas entre especies de la serie Turnera (x= 5), se lleva a cabo un programa de cruzamientos controlados y se obtuvieron numerosos híbridos. Entre las especies con flores amarillas de la serie Turnera, T. krapovickasii, T. scabra y T. subulata poseen citotipos diploide y autotetraploide. Hasta el momento se desconocen el grado de aislamiento reproductivo entre diploides y tetraploides y el grado de afinidad genómica de estas especies a nivel tetraploide. En este trabajo se presentan los resultados del análisis citogenético de los híbridos intraespecíficos triploides (2n=3x=15) de T. krapovickasii y T. scabra y los híbridos tetraploides (2n=4x=20) T. krapovickasii × T. scabra y T. subulata × T. scabra. En los híbridos triploides se hallaron 1-5 trivalentes y la viabilidad del polen fue 11,3% -15,2%. En los híbridos tetraploides se encontraron células con hasta 5 cuadrivalentes y la viabilidad del polen fue 76% -87,97%. Los resultados obtenidos demostraron que el aislamiento reproductivo entre diploides y tetraploides es incompleto y que los híbridos triploides no son completamente estériles. Asimismo, se evidenció que los genomios de T. krapovickasii, T. scabra y T. subulata serían más afines a nivel tetraploide que a nivel diploide.

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“…The other group included T. concinna, T. krapovickasii and T. orientalis. Turnera concinna is diploid, T. krapovickasii has diploid and autopolyploid cytotypes; whereas T. orientalis is allohexaploid (Fernández 1987;Lazaroff et al 2016). Fernández and Arbo (1989) suggested that T. concinna would have derived from T. krapovickasii.…”

Section: Discussionmentioning

confidence: 99%

Electrophoresis characterization ofTurnera sidoidesL. (Passifloraceae: Turneroideae) seed storage proteins and its systematic implications

Moreno

Luque

Neffa

2017

Webbia

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Twenty-four populations of Turnera sidoides were analysed, using seed storage protein fingerprinting techniques, including 19 populations of Turnera spp. and three of Piriqueta spp. for comparative purposes. The aim was to characterize the T. sidoides complex and to evaluate its profiles as a character to clarify its taxonomic position, as well as its evolutionary relationships within the genus Turnera. The present work is the first comparative study of the seed protein fingerprint in Turneroideae. The results proved that seed proteins are useful characters to discriminate between genus and species, as well as to characterize them. The finding of exclusive bands in Turnera and Piriqueta are evidence for the existence of genetic differences between genera, and support their taxonomic identity. Our results are in agreement with evolutionary tendencies of karyotype proposed for Turnera, and support the close relationships between species belonging to the same series, except T. sidoides, which should be singled out of Leiocarpae, supporting the proposal of its inclusion in an independent series.

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Análisis Citogeográfico En Turnera Krapovickasii (Passifloraceae).

Cited by 5 publications

References 47 publications

Autopolyploid lineage shows climatic niche expansion but not divergence inArabidopsis arenosa

Autopolyploid lineage shows climatic niche expansion but not divergence inArabidopsis arenosa

Estudios citogenéticos en híbridos triploides y tetraploides de Turnera krapovickasii, T. scabra y T. subulata (Passifloraceae, Turneroideae).

Electrophoresis characterization ofTurnera sidoidesL. (Passifloraceae: Turneroideae) seed storage proteins and its systematic implications

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