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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
07/08/1997 |
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Data da última atualização: |
05/04/2017 |
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Autoria: |
CARMAN, J. G.; BRISKE, D. D. |
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Título: |
Morphologic and allozymic variation between long-term grazed and non-grazed populations of the bunchgrass Schizachyrium scoparium var. frequens. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
Oecologia, v.66, p.332-337, 1985. |
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Idioma: |
Inglês |
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Conteúdo: |
Plant populations of Schizachyrium scoparium var. frequens with a history of long-term grazing by domestic herbivores were characterized by shorter and narrower leaf blades and tillers of lower weight than plants from populations with a history of no grazing. Following four biweekly defoliation events plants from the grazed populations additionally displayed lower specific leaf weights, lower amounts of biomass removed per tiller upon defoliation and a greater number of new and regrowing tillers. Production values per plant remained similar between the two populations because of a greater number of tillers per plant in the grazed population. A large amount of allozymic polymorphism was observed in both the grazed and non-grazed populations. results of the electrophoretic analyses indicated that a minimum of 66% of the plants sampled represented separate genotypes. No distinction could be made between grazed and non-grazed populations in terms of allozymic partitioning. The morphological variation observed between these two populations may represent a shift in the relative dominance of a series of genotypes variously adapted to herbivory. |
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Palavras-Chave: |
Morfologia; Morphology; Plant. |
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Thesagro: |
Planta; População. |
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Thesaurus Nal: |
population; Schizachyrium scoparium. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01780naa a2200217 a 4500
001 1791457
005 2017-04-05
008 1985 bl --- 0-- u #d
100 1 $aCARMAN, J. G.
245 $aMorphologic and allozymic variation between long-term grazed and non-grazed populations of the bunchgrass Schizachyrium scoparium var. frequens.
260 $c1985
520 $aPlant populations of Schizachyrium scoparium var. frequens with a history of long-term grazing by domestic herbivores were characterized by shorter and narrower leaf blades and tillers of lower weight than plants from populations with a history of no grazing. Following four biweekly defoliation events plants from the grazed populations additionally displayed lower specific leaf weights, lower amounts of biomass removed per tiller upon defoliation and a greater number of new and regrowing tillers. Production values per plant remained similar between the two populations because of a greater number of tillers per plant in the grazed population. A large amount of allozymic polymorphism was observed in both the grazed and non-grazed populations. results of the electrophoretic analyses indicated that a minimum of 66% of the plants sampled represented separate genotypes. No distinction could be made between grazed and non-grazed populations in terms of allozymic partitioning. The morphological variation observed between these two populations may represent a shift in the relative dominance of a series of genotypes variously adapted to herbivory.
650 $apopulation
650 $aSchizachyrium scoparium
650 $aPlanta
650 $aPopulação
653 $aMorfologia
653 $aMorphology
653 $aPlant
700 1 $aBRISKE, D. D.
773 $tOecologia$gv.66, p.332-337, 1985.
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Registro original: |
Embrapa Pantanal (CPAP) |
