Data/hora: 01/06/2024 10:21:36

Provedor de dados: | 39
País: | Brazil
Título: | Leaf phenotypic variation and developmental instability in relation to different light regimes
Autores: | Venâncio,Henrique; Alves-Silva,Estevao; Santos,Jean Carlos.
Data: | 2016-06-01
Ano: | 2016
Palavras-chave: | Antisymmetry; Bauhinia brevipes; Fluctuating asymmetry; Leaf morphometry; Sunlight exposure.
Resumo: | ABSTRACT For pioneer plants, shaded habitats represent a stressful condition, where sunlight exposure is below the optimum level and so leaves expand in order to intercept a greater amount of light. We investigated changes in both phenotypic variation and stress of Bauhinia brevipes in sunny and shaded microhabitats. Leaf area was used as a measure of phenotypic variation, whereas leaf asymmetry (difference between right and left sides of leaves), was used as a measure of stress. We hypothesized an increase in leaf area and stress in shaded locations, which might indicate that B. brevipes was compensating for low light absorption, and elevated levels of stress, respectively. Plants in the sun fitted a fluctuating asymmetry pattern (normal distribution of right minus left sides), while shaded plants were clearly antisymmetric (bimodal distribution of leaf side differences). Leaf asymmetry and area were 5% and 26.8% higher in plants in the shade compared to plants in the sun, respectively. These results were expected since B. brevipes is found predominantly in open areas; so sunlight exposure is important for its development. The presence of antisymmetry is rare in studies of developmental instability, and here it might indicate higher stress compared to plants with fluctuating asymmetry.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000200296
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/0102-33062016abb0081
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.30 n.2 2016
Fonte: | info:eu-repo/semantics/openAccess