Natural selection and genetic adaptation to hypersalinity in Juncus roemerianus Scheele

Eleuterius, Lionel N.

doi:10.1016/0304-3770(89)90090-9

Cited by 25 publications

(20 citation statements)

References 7 publications

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“…However, plants from the Ferblanc population (which grows under h g h salinity) produced significantly greater leaf area (p 5 0.05) under low and moderate salinities than did the Clovelly population (which occurs in a less saline environment). Similar responses have been reported for Juncus roemenanus by Eleuterius (1989).…”

Section: Discussionsupporting

confidence: 75%

“…Through the evolutionary process under the selection pressure of a distinct habitat, a homogeneous species can gradually evolve Into diverse specialized populat i o n~. As a result, these populations become distinct genetically (Eleuterius 1989). In the present study, there was no evidence of restricted gene flow between the 2 S. patens populations studied.…”

Section: Discussionmentioning

confidence: 43%

“…Population differentiation may provide one means of coping with environmental heterogeneity (Heslop-Harrison 1964, Ehrlich & Raven 1969. Such differentiation has been reported for many marsh grasses (Boorman 1967, Gray & Scott 1980, Jefferies et al 1981, Huiskes et al 1985, Eleuterius 1989). Silander (1985) reported that genotypes of S. patens from adjacent saltmarsh, swale and dune areas showed evidence of genetic differentiation.…”

Section: Discussionmentioning

confidence: 99%

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Population differentiation in Spartina patens: gas-exchange response to salinity

Pezeshki¹

1991

Mar. Ecol. Prog. Ser.

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Greenhouse and laboratory studies were conducted to evaluate the effects of gradual vs sudden increase in salinity from 5 to 25 ppt on leaf conductance and net carbon assimilation of 2 Spartina patens populations (Ferblanc and Clovelly) from USA Gulf Coast marshes. Results indicated that the 2 populations had quite similar gas-exchange responses to salinity treatments. However, with progression of each experiment, some differences in responses became apparent. The Ferblanc population (which grows under high salinities in a brackish-saltmarsh zone) maintained greater net carbon assimilation than did the Clovelly population (which grows under low salinities of a freshbrackish zone) in 5 and 15 ppt salinity treatment. At 25 ppt salinity, net carbon assimilation was reduced by 10% for Ferblanc, which was not statistically significant (p = 0.05), and by 22% for Clovelly population, which was statistically significant (p 5 0.05). In addition, Ferblanc plants produced significantly (p 5 0.05) greater leaf area than did the Clovelly population. The observed responses are in accord with the habitat characteristics where these populations grow naturally. Results indicate a potential differentiation between the 2 populations under the salinity-flooding combinations tested. However, there is no evidence of restricted gene flow between these populations. Thus differences found may be due to differential survival of offsprings from a common gene pool rather than evolutionary divergence of isolated populations

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 43%

Section: Discussionmentioning

confidence: 99%

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Population differentiation in Spartina patens: gas-exchange response to salinity

Pezeshki¹

1991

Mar. Ecol. Prog. Ser.

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“…Since seeds used in the study were thoroughly mixed together to allow homogeneity, the cluster analysis suggests that apart from geographic distance, other factors like salinity gradient could also lead to genetic differentiation. This is in agreement with the study of Eleuterius (1989) on Juncus roemerianus (needlegrass rush), which indicated that soil water salinity is the selective force causing genetic differentiation in J. roemerianus.…”

Section: Discussionsupporting

confidence: 92%

Effect of salt stress on genetic diversity of Robinia pseudoacacia seedlings

Gu¹,

Weina²,

Akinnagbe³

et al. 2012

Afr. J. Biotechnol.

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Salt stress is an abiotic stress known to affect plant growth and distribution. In this investigation, this expectation was tested on germination, seedlings' survival and genetic diversity of Robinia pseudoacacia (black locust). To do this, seeds of R. pseudoacacia collected from a natural population were sown on soil media of different salt concentrations (0.6, 1, 2, 3, 4, 5, 6, 7 and 8 g/kg), after which germination and seedlings survival rates were observed. Subsequently, genomic DNA was isolated from leaf samples for genetic analysis using 10 nuclear SSR primers. The results show that seed germination and seedling survival significantly reduced with increase in salt concentration. Specifically, R. pseudoacacia seedlings did not grow on soils with salt concentrations higher than 6 g/kg. As regards the effect of salt stress on genetic diversity of R. pseudoacacia seedlings, the overall result from 10 nuclear microsatellite primers revealed an increase in heterozygosity as salt concentration increased, which suggested selection against homozygosity under salt stress. This result further supports the fact that heterozygosity is one of the factors that ensures that tree populations are adaptable to salt stress. Therefore, management of forest tree populations should be geared towards managing genetic diversity in order to engender survival under salt stress.

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“…P values indicate differences among regions (t tests). Letters indicate significantly different means within regions (ANOVA, followed by Kruskal-Wallis one-way nonparametric comparison for amplitude and Tukey comparison for richness) that J. roemerianus, which is stunted at salinities > 45 PSU (Eleuterius 1989), is unable to tolerate . Occasional periods of hypersaline conditions could also explain the greater amplitude of the mid-marsh zone in Texas because this zone is dominated by succulents that are tolerant of a wide range of abiotic conditions (Richards et al 2005).…”

Section: Discussionmentioning

confidence: 99%

Patterns of Plant Diversity in Georgia and Texas Salt Marshes

Kunza

Pennings

2008

Estuaries and Coasts

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A fundamental question in ecology is how biological interactions and biogeographic processes interact to determine the biodiversity of local sites. We quantified patterns of plant species diversity on transects across elevation at 59 salt marsh sites in Georgia and 49 sites in Texas. Although these regions have similar climates and floras, we anticipated that diversity might differ because of differences in tidal regime. Diversity was measured at global, regional, site, and plot scales to consider processes occurring at all levels. Species pools were similar between regions. Texas had greater diversity at the site and plot scales, suggesting that processes occurring at the site scale differed. The greater diversity of Texas sites and plots was associated with wider distributions of individual species across the marsh landscape and proportionally more middle marsh (a high diversity zone) and less low marsh (a low diversity zone) than in Georgia marshes. Preliminary data suggested that these differences were not due to differences in salinity regime or standing biomass between regions, leaving differences in tidal regime as the most plausible hypothesis accounting for differences in plant diversity. We speculate that the less-predictable tidal regime in Texas leads to temporal variation in abiotic conditions that limit the ability of any one species to competitively exclude others from particular marsh zones.

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Natural selection and genetic adaptation to hypersalinity in Juncus roemerianus Scheele

Cited by 25 publications

References 7 publications

Population differentiation in Spartina patens: gas-exchange response to salinity

Population differentiation in Spartina patens: gas-exchange response to salinity

Effect of salt stress on genetic diversity of Robinia pseudoacacia seedlings

Patterns of Plant Diversity in Georgia and Texas Salt Marshes

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