Patterns of genetic diversity in natural populations of Paspalum agamic complexes

Sartor, Maria Esperanza; Rebozzio, Romina Natalia; Quarín, Camilo Luis; Espinoza, Francisco

doi:10.1007/s00606-013-0797-7

Cited by 10 publications

(15 citation statements)

References 62 publications

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“…A random sample of 89 F 1 individuals together with both parental genotypes, 4PT and GR19, were analyzed. The AFLP experiments were performed using the AFLP Analysis System I (Life Technologies, Invitrogen) following the manufacturer´s instructions with the minor modifications indicated by Sartor et al (2013). Sample quality controls were performed by measuring absorbance at 260 and 280 nm and by electrophoresis in 1% agarose gels to confirm DNA integrity and absence of RNA contamination.…”

Section: Amplified Fragment-length Polymorphism Analysismentioning

confidence: 99%

Inheritance of Aposporous Apomixis in Inter‐specific Hybrids Derived from Sexual Paspalum plicatulum and Apomictic Paspalum guenoarum

et al. 2015

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Apomictic Paspalum plicatulum Michx. and P. guenoarum Arechav. are promising candidates for forage grass development in tropical regions. From a plant breeding perspective, apomixis provides a unique mechanism for developing superior cultivars and preserving them indefinitely. Therefore, analysis of its inheritance is of great interest in these apomictic species. The objective of this work was to analyze the inheritance and expressivity of apomixis in interspecific families derived from crosses between a sexual colchicine‐induced plant of P. plicatulum and an apomictic P. guenoarum plant. One F1, one F2, and three backcross (BC) populations were created. Amplified fragment‐length polymorphism (AFLP) markers confirmed the hybrid origin of the F1 descendants. Analysis of the reproductive mode of the F1 by flow cytometry seed screen (FCSS) showed a segregation ratio of 1.6:1 sexual vs. apomictic plants. The same analysis in F2 and BC populations showed that in selfing or crosses involving sexual genotypes all progeny reproduced by sexuality, while BC populations involving apomictic hybrids as pollen donors produced offspring that segregated for the reproductive mode. Apomixis can be transmitted by pollen from P. guenoarum to other species of the Plicatula group as a simplex (Aaaa) Mendelian dominant factor, and full sexual reproduction requires the homozygous recessive (nulliplex) condition (aaaa) for the apomixis determinant. Results provided here are of interest for breeding apomictic species of Plicatula and for basic research on the genetic determinants of apomixis. Also, the possibility of creating new apomictic cultivars by traditional breeding methods is presented.

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Section: Amplified Fragment-length Polymorphism Analysismentioning

confidence: 99%

Inheritance of Aposporous Apomixis in Inter‐specific Hybrids Derived from Sexual Paspalum plicatulum and Apomictic Paspalum guenoarum

et al. 2015

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“…Paspalum notatum and P. simplex have been the best characterized species of the genus since they share genetic characteristics that represent a high proportion of the Paspalum species. In contrast, similar levels of within-and amongpopulation diversity were observed for P. notatum (Reyno et al, 2012) and P. nicorae (Sartor et al, 2013). These two species have different ploidy levels, including diploid and polyploid plants (Urbani et al, 2002;Gates et al, 2004).…”

Section: Introductionmentioning

confidence: 87%

“…Moreover, the level of within-population diversity in 4x populations being allopatric to 2x populations has been estimated to be low for P. notatum (Daurelio et al, 2004) and P. denticulatum (Sartor et al, 2013). In contrast, similar levels of within-and amongpopulation diversity were observed for P. notatum (Reyno et al, 2012) and P. nicorae (Sartor et al, 2013). Moreover, variation for the within-population diversity has been observed among three allopatric populations of P. simplex (Brugnoli et al, 2013).…”

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confidence: 93%

“…The genus has approximately 330 species (Zuloaga and Morrone, 2005), and many of the characterized species are apomictic (Ortiz et al, 2013). Moreover, the level of within-population diversity in 4x populations being allopatric to 2x populations has been estimated to be low for P. notatum (Daurelio et al, 2004) and P. denticulatum (Sartor et al, 2013). They both are also considered good forages by the local ranchers, and P. notatum is also cultivated in several countries.…”

Section: Introductionmentioning

confidence: 99%

“…Most importantly, tetraploid populations living in proximity to diploid populations are highly variable and share most of the contained variability with the neighboring 2x population (Daurelio et al, 2004;Brugnoli et al, 2013). Moreover, the level of within-population diversity in 4x populations being allopatric to 2x populations has been estimated to be low for P. notatum (Daurelio et al, 2004) and P. denticulatum (Sartor et al, 2013). In contrast, similar levels of within-and amongpopulation diversity were observed for P. notatum (Reyno et al, 2012) and P. nicorae (Sartor et al, 2013).…”

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confidence: 98%

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Diversity in Apomictic Populations of Paspalum simplex Morong

et al. 2014

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Paspalum is considered a genetic model for studying the sources of genotypic variability and breeding techniques in apomictic plants. Paspalum simplex is a warm‐season forage grass that well represents the genus since it contains different ploidy levels and apomixis is linked to polyploidy. The objective was to evaluate the diversity present within and among apomictic polyploid populations of P. simplex. Germplasm was collected from 17 sites covering the species’ region of natural distribution. The diversity present at the molecular level within and among populations was evaluated using ISSR markers. Variability for agronomic traits was also evaluated by cultivating all populations into the field. The 17 analyzed populations were all polyploid, including 13 pure tetraploid, and 4 mixed tetraploid‐hexaploid with predominance of the tetraploid cytotype. Most of the diversity was present among polyploid populations (85% of the total variation), and there was not a correlation between genetic and geographical distances. The within‐population diversity was low for most populations with the exception of one of them. Each genotype was restricted to a single location. Variability for initial growth, spring and fall growth, and the extent of the vegetative phase was observed within and among polyploid populations. The within‐population variation for these phenotypic traits was mainly due to the presence of one or a few off‐type plants. A highly genotype‐specific colonization of new sites appears to occur in P. simplex, and then apomixis mediates the formation of uniform populations.

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Low genetic diversity and contrasting patterns of differentiation in the two monotypic genera Halacsya and Paramoltkia (Boraginaceae) endemic to the Balkan serpentines

Coppi

Mengoni

Pustahija

et al. 2014

Flora - Morphology, Distribution, Functional Ecology of Plants

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Patterns of genetic diversity in natural populations of Paspalum agamic complexes

Cited by 10 publications

References 62 publications

Inheritance of Aposporous Apomixis in Inter‐specific Hybrids Derived from Sexual Paspalum plicatulum and Apomictic Paspalum guenoarum

Inheritance of Aposporous Apomixis in Inter‐specific Hybrids Derived from Sexual Paspalum plicatulum and Apomictic Paspalum guenoarum

Diversity in Apomictic Populations of Paspalum simplex Morong

Low genetic diversity and contrasting patterns of differentiation in the two monotypic genera Halacsya and Paramoltkia (Boraginaceae) endemic to the Balkan serpentines

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