adaptações de plantas submersas à absorção do carbono inorgânico adaptations of submerged plants to inorganic carbon uptake
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ID: 227520
2004
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Abstract
No presente trabalho são discutidos alguns aspectos teóricos dos mecanismos e adaptações empregados pela vegetação submersa para maximizar o aproveitamento do carbono inorgânico na água. O tipo de estratégia utilizada pelas macrófitas aquáticas submersas deve-se a diferenças genéticas entre as espécies e também às condições ambientais predominantes. Vários mecanismos fisiológicos e morfológicos, como a utilização do metabolismo C4, do ácido das crassuláceas (CAM), a utilização do bicarbonato (HCO3-), a utilização do CO2 da água intersticial do sedimento e o desenvolvimento de folhas aéreas foram considerados as principais adaptações para evitar a limitação do carbono no ambiente aquático. De relevância ecológica, a utilização destas diferentes estratégias pode compensar baixas ofertas de CO2 às taxas fotossintéticas de várias espécies submersas e suprimir a fotorrespiração por garantir altas concentrações intracelulares de CO2. Assim, estes mecanismos são responsáveis, em parte, pelo sucesso das macrófitas aquáticas submersas em ambientes oligotróficos, com baixas concentrações de CO2.
In this paper, the main theoretical aspects of the mechanisms and adaptations used by submerged vegetation to maximize the utilization of inorganic carbon are discussed. The type of strategy used by submerged plants is related to both genetic differences among species and environmental conditions. The use of C4 metabolism and crassulacean acid metabolism (CAM), uptake of bicarbonate (HCO3-), uptake of CO2 from interstitial (sediment) water and the development of aerial leaves are considered the main physiological and morphological adaptations to avoid CO2 limitation. These mechanisms are ecologically important given that their utilization overcome the low CO2 availability to several submerged species. In addition, they suppress the photorespiration by increasing the intracellular CO2 concentrations. Thus, these mechanisms are considered among the main reasons to explain the success of submerged plants even in CO2-poor, oligotrophic aquatic ecosystems.
In this paper, the main theoretical aspects of the mechanisms and adaptations used by submerged vegetation to maximize the utilization of inorganic carbon are discussed. The type of strategy used by submerged plants is related to both genetic differences among species and environmental conditions. The use of C4 metabolism and crassulacean acid metabolism (CAM), uptake of bicarbonate (HCO3-), uptake of CO2 from interstitial (sediment) water and the development of aerial leaves are considered the main physiological and morphological adaptations to avoid CO2 limitation. These mechanisms are ecologically important given that their utilization overcome the low CO2 availability to several submerged species. In addition, they suppress the photorespiration by increasing the intracellular CO2 concentrations. Thus, these mechanisms are considered among the main reasons to explain the success of submerged plants even in CO2-poor, oligotrophic aquatic ecosystems.
| Reference Key |
pierini2004actaadaptaes
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|---|---|
| Authors | ;Sandra Andréa Pierini;Sidinei Magela Thomaz |
| Journal | monatshefte für chemie chemical monthly |
| Year | 2004 |
| DOI |
10.1590/S0102-33062004000300020
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