Arquitetura foliar comparativa de Hedychium coronarium J. Koenig (Zingiberaceae) e de Typha domingensis Pers (Typhaceae)

Maria Regina Torres Boeger, Maria Wilhelmina Barbosa de Oliveira Pil, Nilson Belém Filho

Resumo


Diferentes estratégias na intercepção de luz pelas plantas podem determinar variações estruturais na folha. O objetivo deste trabalho foi comparar a morfoanatomia de Hedychium coronarium e Typha domingensis, que co-habitam em locais com alta luminosidade e solo saturado com água. As folhas de T. domingensis são orientadas verticalmente, mas apenas as folhas mais jovens de H. coronarium são verticais. As características morfoanatômicas foliares analisadas foram: área, massa seca, comprimento total, largura e espessura do ápice, terço-médio e base, densidade estomática, ângulo de inserção. A orientação vertical, anfiestomatismo, mesofilo simétrico e sistema lacunar permitem que as folhas de T. domingensis atinjam grandes áreas. As folhas de H. coronarium possuem maior número de estômatos na face abaxial, hipoderme, mesofilo assimétrico e enrolamento das margens, que são aparentes medidas preventivas de fotoinibição. O sucesso da colonização e a rápida proliferação destas espécies se deve, em parte, à arquitetura de suas folhas.


Palavras-chave


morfologia foliar, orientação foliar, taboa, lírio-do-brejo.

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Referências


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