Assessment of genetic diversity and population structure of Tunisian populations of Brachypodium hybridum by SSR markers

Neji, Mohamed; Geuna, F.; Taamalli, Wael; Ibrahim, Yosra; Chiozzotto, Remo; Abdelly, Chédly

doi:10.1016/j.flora.2015.08.001

Cited by 11 publications

(10 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The absence of a significant relationship between geographical and genetic distance indicates a marked local differentiation, rather than a gradual change in allele frequencies across the range of H. marinum in Tunisia. In agreement with the current results, several studies found no dependence of the genetic structure of populations on geographic origin of crops (Turpeinen et al, 2003;Neji et al, 2015), while other studies (Volis et al, 2001) have indicated significant correlations between genetic variation and geographical parameters. However, it was found that some environmental factors play an important role in genetic diversity and enhancing population divergence in H. marinum ssp.…”

Section: Ecogeographical Variablessupporting

confidence: 92%

“…Similar results showing the predominance of within-population variation were obtained for cultivated (Chen et al ., 2006; Jaradat and Shahid, 2006) and wild barley ( H. spontaneum ) (Dawson et al ., 1993; Baum et al ., 1997; Volis et al ., 2002). Moreover, this finding agrees with those observed for other natural Tunisian self-fertilizing species, where the within-population component was predominant, such as Medicago truncatula species (Arraouadi et al ., 2009) and Brachypodium hybridum (Neji et al ., 2015).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, Neji et al . (2015) showed that the population of Ain Draham (a region close to Tabraka) clusters separately from eight other populations of Brachypodium hybridum .…”

Section: Discussionmentioning

confidence: 99%

“…Studying genetic diversity in Tunisian Cakile maritima, Gandour et al (2008) found high differentiation of Tabarka population from the other populations, and supported these results by the absence of a tidal current between Tabarka and the remaining populations. In addition, Neji et al (2015) showed that the population of Ain Draham (a region close to Tabraka) clusters separately from eight other populations of Brachypodium hybridum.…”

Section: Ecogeographical Variablesmentioning

confidence: 99%

See 3 more Smart Citations

Analysis of genetic diversity and spatial structure in Tunisian populations ofHordeum marinumssp.marinumbased on molecular markers

et al. 2019

View full text Add to dashboard Cite

Hordeum marinum commonly known as sea barley is a salinity-tolerant species of grass. In the current study, 150 lines from ten populations of H. marinum ssp. marinum collected from five Tunisian bioclimatic sites were screened for polymorphism with 13 selected random amplified polymorphic DNA primers. Results exhibited a high level of polymorphism (160 polymorphic bands with an average of 12.46 per primer) and a high level of genetic diversity in all the studied populations (on average UHe = 0.247 and I = 0.358). High discrimination capacity was found for the 13 primers and a combination of three allowed assignation of a unique profile for each of the 150 lines. The partition of genetic diversity with Analysis of Molecular Variance suggested that the majority of genetic variation (67%) was within populations. The components between-populations within ecoregions and between-ecoregions explained 21 and 12%, respectively, of the total genetic variance. There was no significant association of population differentiation (ФPT) with geographical distance or altitudinal difference. Results also showed that the 150 lines grouped into three clusters with no respect to geographic origin. A sub-set of 13 lines was identified, which captured the maximum genetic diversity of the entire collection. The genetic variation found in this collection of H. marinum is deemed to be useful in formulating conservation strategies for this species.

show abstract

Section: Ecogeographical Variablessupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

“…In addition, Neji et al . (2015) showed that the population of Ain Draham (a region close to Tabraka) clusters separately from eight other populations of Brachypodium hybridum .…”

Section: Discussionmentioning

confidence: 99%

Section: Ecogeographical Variablesmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of genetic diversity and spatial structure in Tunisian populations ofHordeum marinumssp.marinumbased on molecular markers

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Both species are essentially selfing (Vogel et al ., ), although reported heterozygosity is higher in B. hybridum than in B. distachyon (Neji et al ., ). Tetraploids produce bigger seeds than diploids (6.19 ± 0.18 mg and 4.8 ± 0.19 mg, mean ± SE, respectively).…”

Section: Methodsmentioning

confidence: 97%

The interplay between aridity and competition determines colonization ability, exclusion and ecological segregation in the heteroploid Brachypodium distachyon species complex

2017

View full text Add to dashboard Cite

A higher competitive advantage of polyploid plants compared with their parental diploids is frequently invoked to explain their establishment success, colonization of novel environments and cytotypic ecological segregation, yet there is scarce experimental evidence supporting such hypotheses. Here, we investigated whether differential competitive ability of species of the Brachypodium distachyon (Poaceae) species complex, a model system for genomic, ecological and evolutionary studies of temperate grasses, contributes to explaining their ecological segregation as well as their coexistence in diploid/allotetraploid contact zones. We conducted two field experiments in dry and humid localities to evaluate the tolerance to competition of diploids and allotetraploids in densely occupied environments, and to parameterize models of intra- and intercytotype competition as a mechanism for species exclusion/coexistence. We provide experimental evidence supporting the hypothesis that, under natural field conditions, allotetraploids have superior ecological success compared with one of their parental diploids in terms of both colonizing competitive habitats and intercytotypic competition, with the balance of intra/intercytotype competition favoring polyploid population establishment. These findings, together with previous data on ecogeographic segregation and adaptive response to water stress, suggest that the interplay between aridity and competitive outcome determines the ability to colonize competitive environments, the exclusion of diploids, especially in arid localities, and species geographic segregation.

show abstract

Variation of forage quality traits in Tunisian populations of Brachypodium hybridum in response to phosphorus deficiency

et al. 2021

Self Cite

View full text Add to dashboard Cite

Natural populations of plants may express plastic response, evolve local adaptation, or combine both mechanisms to enhance their genetic variation. Here, 79 lines from Tunisian Brachypodium hybridum populations were cultivated in two contrasting phosphorus (P) availability levels, and their genetic variation was investigated using forage quality traits to identify the mechanisms governing their genetic variation. Results revealed large variation among populations for most traits and separation between coastal and inland populations in both P levels. All traits revealed high heritability, and the response of most traits to P deficiency was influenced by the population effect which accounted 52.38% of the variation, indicating strong population differentiation. Although significant for most traits, only 18.13% of variation was attributed to P treatment, suggesting little plastic response to P deficiency.However, the lack of population × treatment effect for most traits suggested a common plastic response in populations. Moreover, 56.99% of variation was attributed to environmental factors with distance to coastline, precipitation seasonality, and annual precipitation being the major factors, suggesting that the strong population differentiation reflects local adaptation to specific environments. Contrary to coastal populations characterized by high levels of fiber-related traits, the inland ones displayed high values of most energy-related traits, suggesting that these latter were characterized by higher forage quality. Overall, our results suggested that the effect of local adaptation overrides the effect of phenotypic plasticity regarding the

show abstract

Assessment of genetic diversity and population structure of Tunisian populations of Brachypodium hybridum by SSR markers

Cited by 11 publications

References 48 publications

Analysis of genetic diversity and spatial structure in Tunisian populations ofHordeum marinumssp.marinumbased on molecular markers

Analysis of genetic diversity and spatial structure in Tunisian populations ofHordeum marinumssp.marinumbased on molecular markers

The interplay between aridity and competition determines colonization ability, exclusion and ecological segregation in the heteroploid Brachypodium distachyon species complex

Variation of forage quality traits in Tunisian populations of Brachypodium hybridum in response to phosphorus deficiency

Contact Info

Product

Resources

About