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Provedor de dados:  Rev. Bras. Bot.
País:  Brazil
Título:  Leaf optical properties of two liana species Canavalia parviflora Benth. and Gouania virgata Reissk in different light conditions
Autores:  Sanches,Maria Cristina
Válio,Ivany Ferraz Marques
Data:  2006-06-01
Ano:  2006
Palavras-chave:  Leaf absorptance
Lianas
Light conditions
Reflectance
Specific leaf area
Resumo:  Lianas are plants that depend on support to reach some appreciable height, and they represent an important structural component of tropical forests. Although they predominate in clearings and gaps, some species survive in the understory. Changes in irradiance between these environments can affect leaf morphology and absorption of photosynthetic active radiation (PAR). We had examined the effects of different light regimes on leaf optical properties, chlorophyll content, specific leaf area, and leaf surface morphology in young seedlings of Canavalia parviflora Benth. (Fabaceae) and Gouania virgata Reissk (Rhamnaceae). The seedlings were distributed on workbenches covered by different layers of neutral shade netting, thus creating three levels of light intensity corresponding to about 40%, 10% and 1.5% of solar irradiance. Plants growing in full sun were used as a control. Both species exhibited an increase in reflectance in full sun and alterations in leaf morphology. Reduction in irradiance induced an increase in absorptance (decrease in reflectance and transmittance) in C. parviflora leaves in the green due to higher chlorophyll content. In G. virgata the spectral leaf changes were less observable. However, the efficiency of absorption was more pronounced in G. virgata than in C. parviflora leaves under 40%, 10% and 1.5% photon flux density (PFD). The greater efficiency of absorption in G. virgata was due to a larger specific leaf area (SLA) under these conditions. The adjustments in leaf optical properties can aid these species in overall carbon gain under limited light conditions.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000200013
Editor:  Sociedade Botânica de São Paulo
Relação:  10.1590/S0100-84042006000200013
Formato:  text/html
Fonte:  Brazilian Journal of Botany v.29 n.2 2006
Direitos:  info:eu-repo/semantics/openAccess
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