Wood anatomy of Mollinedia glabra (Spreng.) Perkins (Monimiaceae) in two Restinga Vegetation Formations at Rio das Ostras, RJ, Brazil

Anais da Academia Brasileira de Ciências

Fernanda Da S. Novaes²  Cátia H. Callado¹  Maria Verônica L. Pereira-moura²  Helena R.p. Lima² 

[1] ,Universidade Federal Rural do Rio de Janeiro Instituto de Biologia Departamento de BotânicaSeropédica RJ ,Brasil

关键词: Mollinedia glabra;    Monimiaceae;    restinga;    wood anatomy;    Mollinedia glabra;    Monimiaceae;    restinga;    anatomia do lenho;   

DOI  :  10.1590/S0001-37652010000400014

来源: SciELO

【 摘 要 】

This paper aimed to characterize the anatomical structure of the wood of specimens of Mollinedia glabra (Spreng.) Perkins growing in two contiguous formations of restinga vegetation at Praia Virgem, in the municipality of Rio das Ostras, RJ. Both the Open Palmae (OPS) and the Sandy Strip Closed Shrub (SSCS) formations are found in coastal regions that receive between 1,100 and 1,300 mm of rainfall per year. Sapwood samples were collected in both formations. Typical anatomical features for this species include: solitary vessels, radial multiples or clusters elements, that are circular to angular in outline, 5-15 barred scalarifor perforation plates, ood parenchya scanty, septate fiber-tracheids, and wide multiseriate rays with prismatic crystals. Statistical analyses indicated a significant increase in the frequency of vessel elements and an increase in fiber-tracheid diameters in OPS individuals. These characteristics are considered structural adaptations to increased water needs caused by a greater exposure to sunlight. Continuous pruning may be responsible for the tyloses observed in OPS plants. The greater lengths and higher frequencies of the rays in SSCS trees ay be due to the greater diaeters of their branches. ur results suggest that . glabra develops structural adaptations to the restinga micro-environmental variations during its development.

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