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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
16/03/1999 |
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Data da última atualização: |
16/03/1999 |
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Autoria: |
CHABOT, B. F.; CHABOT, J. F. |
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Afiliação: |
Section of Ecology and Systematics, Cornell University, Ithaca, New York, USA. |
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Título: |
Effects of light and temperature on leaf anatomy and photosynthesis in Fragaria vesca. |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
Oecologia, v.26, p.363-377, 1977. |
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Idioma: |
Inglês |
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Conteúdo: |
Fragaria vesca, the woodland strawberry, was grown under a series of controlled environment including variation in light intensity, average temperatures, and temperature amplitude around a constant mean. Observations on CO2 exchange capacities, leaf anatomy, and cell ultrastrucutre were made for each treatment to determine relationships between these variables. With increasing light intensity, leaf thickness, leaf density, and mesophyll cell surface are and volume per leaf surface area increased. Ne photosynthesis (NPS) per leaf weight decreased with increasing light pretreatment while NPS per area increased from low to medium intensity, then decreased at the highest intensity. Depression of photosynthesis at the highest light pretreatment may have been due to massive starch accumulation in the chloroplast associated with the sodium vapor lamps used. Correlation of alal anatomical variables was higly significant with dark respiration and NPS per dry weight but insignificant for NPS per leaf area. In the variable temperature treatments, photosynthetic acclimation occurred with a shift in optimum temperature for NPS in the direction of prevailing growth temperature. Absolute rates were highest at moderate pretreatment temperatures and were reduced by extreeme growth temperatures. Thick leaves with low density mesophyll became thinner and more dense with increasing growth temperature corresponding to an increase in maximum net photosynthetic rates. Leaves became thicker and more dense at the highest temperatures, but with an increase in cell damage and indications of changes in metabolic pathways. Highest correlations for gas exchange rates were with specific leaf weight (weight per area). Correlation with order anatomical variables were scattered or insignifiant. It was concluded that adaptation to a range of environmental conditions cannot be consistently attributed to changes in mesophyll cell volume or surface area. MenosFragaria vesca, the woodland strawberry, was grown under a series of controlled environment including variation in light intensity, average temperatures, and temperature amplitude around a constant mean. Observations on CO2 exchange capacities, leaf anatomy, and cell ultrastrucutre were made for each treatment to determine relationships between these variables. With increasing light intensity, leaf thickness, leaf density, and mesophyll cell surface are and volume per leaf surface area increased. Ne photosynthesis (NPS) per leaf weight decreased with increasing light pretreatment while NPS per area increased from low to medium intensity, then decreased at the highest intensity. Depression of photosynthesis at the highest light pretreatment may have been due to massive starch accumulation in the chloroplast associated with the sodium vapor lamps used. Correlation of alal anatomical variables was higly significant with dark respiration and NPS per dry weight but insignificant for NPS per leaf area. In the variable temperature treatments, photosynthetic acclimation occurred with a shift in optimum temperature for NPS in the direction of prevailing growth temperature. Absolute rates were highest at moderate pretreatment temperatures and were reduced by extreeme growth temperatures. Thick leaves with low density mesophyll became thinner and more dense with increasing growth temperature corresponding to an increase in maximum net photosynthetic rates. Leaves became thicker and mor... Mostrar Tudo |
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Palavras-Chave: |
Anatomia da folha; Efeito da luz; Effects of light; Leaf anatomy; Plant. |
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Thesagro: |
Fotossíntese; Fragaria Vesca; Planta; Temperatura. |
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Thesaurus Nal: |
photosynthesis; temperature. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02642naa a2200265 a 4500
001 1794324
005 1999-03-16
008 1977 bl --- 0-- u #d
100 1 $aCHABOT, B. F.
245 $aEffects of light and temperature on leaf anatomy and photosynthesis in Fragaria vesca.
260 $c1977
520 $aFragaria vesca, the woodland strawberry, was grown under a series of controlled environment including variation in light intensity, average temperatures, and temperature amplitude around a constant mean. Observations on CO2 exchange capacities, leaf anatomy, and cell ultrastrucutre were made for each treatment to determine relationships between these variables. With increasing light intensity, leaf thickness, leaf density, and mesophyll cell surface are and volume per leaf surface area increased. Ne photosynthesis (NPS) per leaf weight decreased with increasing light pretreatment while NPS per area increased from low to medium intensity, then decreased at the highest intensity. Depression of photosynthesis at the highest light pretreatment may have been due to massive starch accumulation in the chloroplast associated with the sodium vapor lamps used. Correlation of alal anatomical variables was higly significant with dark respiration and NPS per dry weight but insignificant for NPS per leaf area. In the variable temperature treatments, photosynthetic acclimation occurred with a shift in optimum temperature for NPS in the direction of prevailing growth temperature. Absolute rates were highest at moderate pretreatment temperatures and were reduced by extreeme growth temperatures. Thick leaves with low density mesophyll became thinner and more dense with increasing growth temperature corresponding to an increase in maximum net photosynthetic rates. Leaves became thicker and more dense at the highest temperatures, but with an increase in cell damage and indications of changes in metabolic pathways. Highest correlations for gas exchange rates were with specific leaf weight (weight per area). Correlation with order anatomical variables were scattered or insignifiant. It was concluded that adaptation to a range of environmental conditions cannot be consistently attributed to changes in mesophyll cell volume or surface area.
650 $aphotosynthesis
650 $atemperature
650 $aFotossíntese
650 $aFragaria Vesca
650 $aPlanta
650 $aTemperatura
653 $aAnatomia da folha
653 $aEfeito da luz
653 $aEffects of light
653 $aLeaf anatomy
653 $aPlant
700 1 $aCHABOT, J. F.
773 $tOecologia$gv.26, p.363-377, 1977.
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Registro original: |
Embrapa Pantanal (CPAP) |
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