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Acta Botanica Brasilica

Print version ISSN 0102-3306


BASTOS, Eleci de Oliveria; PERAZZOLO, Mara  and  BAPTISTA, Jusseli Maria Rocha. Variation in the number of stomata and microhairs of Paspalum vaginatum Sw: en relation to abiotic conditions in a breakwater in the Lagoa dos Patos estuary, RS-Brazil. Acta Bot. Bras. [online]. 1992, vol.6, n.2, pp.105-117. ISSN 0102-3306.

Paspalum vaginatum Sw., a perennial, stoloniferous grass with small leaves presenting stomata on both epidermises is characteristic of salt marshes, growing under stressful conditions near the west breakwater of the Rio Grande outlet, Lagoa dos Patos, Rio Grande do Sul, Brazil. Monthly counts of stomata and microhairs on the adaxial and abaxial surfaces were related to the abiotic characteristics of the enviroment. The number of microhairs of the abaxial leaf surface varied significantly and directly with interstitial water temperature close to the rhyzosphere. However, these counts did not correlate with the interstitial salinity. The results suggest that the species is a facultative halophyte. Stomata counts of the abaxial surface showed an inverse relation to precipitation. Paspalum vaginatum appears to be a species with xeromorphic characteristics.

Keywords : Paspalum vaginatum; adaptations; salt marsh; abiotic characteristics.

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