A comparative study of the morphology and isoenzyme patterns of Hydrilla verticillata (L.f.) Royle

Verkleij, J. A. C.; Pieterse, A.H.; Horneman, Gerda J.T.; Torenbeek, Marian

doi:10.1016/0304-3770(83)90017-7

Cited by 48 publications

(35 citation statements)

References 16 publications

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“…The prevalence of sexual reproduction in E. densa was modest at best, similar to levels of sexual reproduction observed in E. najas (Mori et al, 1999), suggesting that the major source of new diversity in Jupiá Lake is the introduction of vegetative shoots. This pattern of colonization by one or a few well-adapted genotypes is consistent with observations of other aquatic perennials such as H. verticilata (Verkleij et al, 1983), Elodea nuttalli (Kodono et al, 1997), and E. najas (Mori et al, 1999;Martins et al, 2003).…”

Section: Discussionsupporting

confidence: 89%

“…E. najas populations were slightly more polymorphic and appear to form four groups (Table 2). Similarly, Verkleij et al (1983) reported that all US populations of the exotic plant, H. verticilata, sampled in their study had identical isoenzyme phenotypes. The authors concluded that the vast Hydrilla populations in US lakes appear to share a single clonal origin most likely arising from a single colonization event.…”

Section: Discussionmentioning

confidence: 71%

“…The technique used in this study involved minor variations from frequently cited methods. One hundred milligram of fresh leaves from each plant were used to prepare a crude homogenate using the extraction technique of Verkleij (1983). Three gel/electrode buffer systems ( Figure 2) were used based on Cheliak and Pitel (1984), Alfenas et al (1991) and Ballve et al (1991), with electrophoresis performed at temperatures near 5 °C.…”

Section: Isoenzyme Proceduresmentioning

confidence: 99%

“…In addition, Verkleij et al (1983) studied 28 populations of H. verticilata from Pakistan, India, Malaysia, Indonesia, New Zealand, USA, Panama and Poland, using 18 isoenzymatic systems. Les et al (1997) and Ryan et al (1995) characterized H. verticilata using molecular markers.…”

Section: Introductionmentioning

confidence: 99%

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Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil

et al. 2012

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Guries. 2012. Genetic diversity in Egeria densa and E. najas in JupiáReservoir, Brazil. Cien. Inv. Agr. 39(2):321-330. The aquatic plant species Egeria densa (Planch.) Casp and E. najas Planchon occur naturally in the Paraná River Basin of southeastern Brazil. Hydroelectric dam construction in the river basin has created several lakes, changing the ecology of the river and altering the population ecology of Egeria. Large, dense populations of Egeria now grow in Jupiá Lake and its tributaries, occasionally blocking hydroelectric turbines. This study is part of a larger project examining environmental changes associated with large dam projects; the research objective of this study was to assess patterns of genetic diversity in Egeria populations growing in Jupiá and Três Irmãos Lakes and their Paraná River tributaries using genetic markers. Forty-two plants of E. najas and 46 of E. densa (for a total of 88 samples) were collected from 13 sites. Genotypes were identified by isoenzymes and Random Amplification of Polymorphic DNA RAPD markers. Using a genetic distance dendrogram we grouped all E. densa plants into one set and all E. najas plants into another set. The plant sample 8a, which presented intermediary morphological characteristics of both species, also presented intermediary genetic characteristics, indicating the possibility that gene introgression between these Egeria species may occur. The creation of Três Irmãos Lake appears to have increased some measures of genetic diversity in Egeria populations by facilitating outcrossing among previously semiisolated genotypes. Increased migration of large numbers of seeds and vegetative branches of E. densa and E. najas into Jupiá Lake and its tributaries can account for most of the changes in patterning of genetic diversity observed in these populations of Egeria.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 71%

Section: Isoenzyme Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil

et al. 2012

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“…A variabilidade normalmente é pequena ou nula entre indivíduos, como foi citado por Verkleij et al (1983), com a espécie Hydrilla verticilata em lagos artificiais nos Estados Unidos. No entanto, o reservatório de Jupiá está acumulando plantas de E. najas que é nativa da bacia do rio Paraná.…”

Section: Análise Biométricaunclassified

Caracterização genética de populações de Egeria najas presentes no reservatório de Jupiá e rios afluentes

et al. 1999

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A Egeria najas é uma espécie aquática submersa nativa da bacia hidrográfica do rio Paraná. Com o represamento das águas do rio para geração de energia elétrica a espécie tem mudado seu comportamento de colonização dos leitos dos rios e ocorrido em grandes maciços dentro da represa de Jupiá e rios afluentes. Essa planta tem causado problemas por obstruir a passagem de água para as turbinas de geração de energia elétrica. ABSTRACT Genetic characterization of Egeria najas presented in the Jupia Lake and its tributariesThe submerged aquatic species Egeria najas occurs naturally in the Parana River BasinBrazil. Several lakes have been constructed by CESP -Centrais Elétricas do Estado de São Paulo S.A. in the river basin, changing the ecology of the region. The species have altered their establishment strategy, and now grows in large, dense populations on the floor of Jupia Lake and its tributaries. This has had a negative impact on electricity generation as the branches of these species routinely block the hydroelectric turbines. We used genetic markers to study the pattern of genetic diversity in the species using plant material collected along Jupia Lake and the Paraná River Tributaries. Isoenzymes have shown four different biotypes, however, the RAPD technique has demonstrated greater genetic variability among individuals. The creation of Jupia Lake has resulted in an increase in genetic variability probably by migration of large amount of seeds and vegetative branches. These materials are increasing the genetic diversity in populations in the lake by favoring outcrossing among different genotypes. Results also present a possible understanding of Egeria najas genotype migrations in populations in the Jupia Lake and its tributaries.

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Hydrilla Invades Washington, D.C. And the Potomac

Steward

Van

Carter

et al. 1984

American J of Botany

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The aquatic weed hydrilla (Hydrilla verticillata Royle) was discovered growing in the Potomac River, south of Alexandria, VA, in Kenilworth Aquatic Gardens, Washington, D.C., and in the Chesapeake and Ohio (C&O) Canal near Seneca, MD. Cultures in Florida of the Kenilworth clone produced male flowers. This is the first report of the occurrence of the male in the U.S. Two distinct isoenzyme patterns have been identified for plants from various locations in the U.S., corresponding to a monoecious strain and a dioecious female. The occurrence of the wild colonies of the monoecious Hydrilla greatly increase the potential for physiological diversity through sexual reproduction, which may have serious consequences for the management of this weed.

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A comparative study of the morphology and isoenzyme patterns of Hydrilla verticillata (L.f.) Royle

Cited by 48 publications

References 16 publications

Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil

Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil

Caracterização genética de populações de Egeria najas presentes no reservatório de Jupiá e rios afluentes

Hydrilla Invades Washington, D.C. And the Potomac

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