Resumo

CASIERRA-POSADA, Fánor; PEREZ, Wilson A.  e  PORTILLA, Fernando. Water relations and dry matter partitioning of NaCl stressed furcraea species (Furcraea sp. Vent.). Agron. colomb. [online]. 2006, vol.24, n.2, pp.280-289. ISSN 0120-9965.

The genus Furcraea is a member of Agavaceae family endemic to Tropical America, especially to the Andean region of Colombia and Venezuela, although naturally is distributed from Mexico down to Brazil. A number of Furcraea species are cultivated in warm climates worldwide as ornamentals and for leaf fibers. In order to determine physiological responses to salinity, plants of local furcraea species (Furcreaea castilla, F. macrophylla, and F. cabuya) were exposed to 20, 40, 60, or 80 millimolar NaCl for five months. Control plants were salt-untreated. The experiment was carried out in a greenhouse in Tunja, Colombia. Plants were obtained from bulbils and grown in pots with soil that were irrigated two times a week and the water excess was avoided after induced soil salinization. Results showed that increased salinity in soil reduced total dry matter production, agronomic water use efficiency (WUE), root-shoot ratio, specific leaf density, and leaf area. Additionally, the NaCl salinity modified dry matter partitioning pattern in the evaluated species. Evapotranspiration was slightly influenced by salinity. The studied species showed genotypic differences in salt tolerance for most of the evaluated parameters.

Palavras-chave : F. macrofphylla; F. cabuya; F. castilla; evapotranspiration; leaf area; salinity; WUE.

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