Species limits in Vachellia (Acacia) karroo (Mimosoideae: Leguminoseae): Evidence from automated ISSR DNA “fingerprinting”

Taylor, Cindy L.; Barker, Nigel P.

doi:10.1016/j.sajb.2012.07.014

Cited by 20 publications

(15 citation statements)

References 40 publications

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“…Furthermore, our study suggests that this dispersion should have occurred relatively recently, as described by the historical records (Rei, 1925;Marchante, 2011), similarly to what has been reported with Vachellia (Acacia) karroo, a native woody species from South Africa that invades grasslands, which showed no genetic clustering and limited genetic differentiation (Taylor and Barker, 2012). The genetic diversity observed in A. longifolia (h = 0.166-0.213, Table 1) seemed to be within the range of values for other Acacia species living in their natural habitat, for example populations of A. senegal in Kenya (h = 0.283, using ISSRs and RAPDs) (Josiah et al, 2008), A. caven (h = 0.278, using AFLPs) and A. visco (h = 0.200, using AFLPs) from Argentina (Pometti et al, 2012(Pometti et al, , 2016.…”

Section: Genetic Diversity and Population Differentiationsupporting

confidence: 87%

Genetic diversity and differentiation of invasive <i>Acacia longifolia</i> in Portugal

2018

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Abstract. Acacia longifolia is an aggressive invader worldwide. This species was brought to Portugal by the forestry services and is now found throughout the country with very strong ecological and social impacts. Although several ecological and physiological studies have been carried out, molecular studies in this species are sparse. Particularly, genetic variability evaluation in invasive ranges clearly deserves more attention. The aim of this study was to evaluate the genetic diversity and the genetic differentiation among populations of the alien invasive A. longifolia under different Mediterranean conditions. For that we studied three sandy dune populations along the Portuguese coast: Osso da Baleia (mesomediterranean), Pinheiro da Cruz and Vila Nova de Milfontes (termomediterranean). All sampled acacia plants were located underneath a pine forest, with the exception of the latter case study, where we also sampled in a diversified habitat conditions associated with the margins of agriculture fields. According to the historical records, it was also possible to compare acacia samples from original plantations and recently invaded areas. We have used two molecular markers -inter-simple sequence repeats (ISSR) and microsatellites (SSR). ISSR analysis showed that A. longifolia populations at all sampled locations have similar levels of diversity and a relatively low differentiation ( PT = 0.135). However, samples tended to cluster according to the regional (macro-scale) collection site. Microsatellites confirmed this low differentiation pattern. Our results indicate that differences in phenology and reproductive success observed during a previous study cannot be accounted for by genetic diversity and differentiation alone. Furthermore, our results taken together with historical information of A. longifolia suggest a single original introduction and a subsequent acclimation process.

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Section: Genetic Diversity and Population Differentiationsupporting

confidence: 87%

Genetic diversity and differentiation of invasive <i>Acacia longifolia</i> in Portugal

2018

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“…Acacia karroo is known as sweet thorn, and it is widely distributed across different habitats of the South African region, including dry thornveld, river valley scrub, bushveld, woodland, grassland, river banks and coastal dunes of South Africa, Namibia, Angola, Botswana, Zambia and Zimbabwe [52]. Acacia karroo may grow as a shrub or small to medium-sized tree to a height of 12 m. It is a pioneer species and has the ability to encroach rapidly into grassland grazing areas, and it considered to be the most important woody invader of grasslands in South Africa [52].…”

Section: Identification Of Mesquite and Other Co-existent Tree Speciesmentioning

confidence: 99%

“…Acacia karroo may grow as a shrub or small to medium-sized tree to a height of 12 m. It is a pioneer species and has the ability to encroach rapidly into grassland grazing areas, and it considered to be the most important woody invader of grasslands in South Africa [52].…”

Section: Identification Of Mesquite and Other Co-existent Tree Speciesmentioning

confidence: 99%

Examining the Spectral Separability of Prosopis glandulosa from Co-Existent Species Using Field Spectral Measurement and Guided Regularized Random Forest

et al. 2016

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Abstract:The invasive taxa of Prosopis is rated the world's top 100 unwanted species, and a lack of spatial data about the invasion dynamics has made the current control and monitoring methods unsuccessful. This study thus tests the use of in situ spectroscopy data with a newly-developed algorithm, guided regularized random forest (GRRF), to spectrally discriminate Prosopis from coexistent acacia species (Acacia karroo, Acacia mellifera and Ziziphus mucronata) in the arid environment of South Africa. Results show that GRRF was able to reduce the high dimensionality of the spectroscopy data and select key wavelengths (n = 11) for discriminating amongst the species. These wavelengths are located at 356.3 nm, 468.5 nm, 531.1 nm, 665.2 nm, 1262.3 nm, 1354.1 nm, 1361.7 nm, 1376.9 nm, 1407.1 nm, 1410.9 nm and 1414.6 nm. The use of these selected wavelengths increases the overall classification accuracy from 79.19% and a Kappa value of 0.7201 when using all wavelengths to 88.59% and a Kappa of 0.8524 when the selected wavelengths were used. Based on our relatively high accuracies and ease of use, it is worth considering the GRRF method for reducing the high dimensionality of spectroscopy data. However, this assertion should receive considerable additional testing and comparison before it is accepted as a substitute for reliable high dimensionality reduction.

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“…It increases nitrogen when used in alley cropping, and is used in re-vegetation programs in Africa because of its beneficial symbiosis with rhizobia (Zahran, 2001). In South Africa alone V. karroo has various morpho-types growing in regions of diverse climatic and soil conditions (Taylor and Barker, 2012). There is limited information on V. karroo's symbiotic relationship with rhizobia and the nature of rhizobia nodulating it, especially in South African soils.…”

Section: Introductionmentioning

confidence: 99%

Phenotypic characterisation of rhizobia nodulating differentmorphotypes of Vachellia karroo

Ngwenya

Zharare

Basson

et al. 2016

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Vachellia karroo is an important pasture legume which fixes nitrogen through its symbiotic relationship with rhizobia. Thirty two indigenous rhizobia were isolated from four different morphotypes of V. karroo obtained from four agroecologically diverse areas of South Africa. Phenotypic characterization of isolates revealed that they have the same colony morphology. Numeric analysis of the isolates' phenotypic characteristics produced six clusters at 83% level of relative similarity. High variation of the isolates growth in different temperatures, salt concentration, pH, antibiotic resistance and heavy metal resistance was also noted. Carbon source utilization was generally the same for all isolates. Isolates that tolerated a wide range of test conditions are recommended as potentially highly competitive V. karroo inoculants for use in various climatic and soil conditions.

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Species limits in Vachellia (Acacia) karroo (Mimosoideae: Leguminoseae): Evidence from automated ISSR DNA “fingerprinting”

Cited by 20 publications

References 40 publications

Genetic diversity and differentiation of invasive <i>Acacia longifolia</i> in Portugal

Genetic diversity and differentiation of invasive <i>Acacia longifolia</i> in Portugal

Examining the Spectral Separability of Prosopis glandulosa from Co-Existent Species Using Field Spectral Measurement and Guided Regularized Random Forest

Phenotypic characterisation of rhizobia nodulating differentmorphotypes of Vachellia karroo

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Species limits in Vachellia (Acacia) karroo (Mimosoideae: Leguminoseae): Evidence from automated ISSR DNA “fingerprinting”

Cited by 20 publications

References 40 publications

Genetic diversity and differentiation of invasive &lt;i&gt;Acacia longifolia&lt;/i&gt; in Portugal

Genetic diversity and differentiation of invasive &lt;i&gt;Acacia longifolia&lt;/i&gt; in Portugal

Examining the Spectral Separability of Prosopis glandulosa from Co-Existent Species Using Field Spectral Measurement and Guided Regularized Random Forest

Phenotypic characterisation of rhizobia nodulating differentmorphotypes of Vachellia karroo

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Genetic diversity and differentiation of invasive <i>Acacia longifolia</i> in Portugal

Genetic diversity and differentiation of invasive <i>Acacia longifolia</i> in Portugal