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| Format: | Artículo científico |
| Language: | en |
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Academia Brasileira de Ciências
2003
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| Online Access: | https://www.redalyc.org/articulo.oa?id=32775403 |
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Table of Contents:
- Epicuticular waxes from caatinga and cerrado species and their efficiency against water loss Antonio F. M. Oliveira Sérgio T. Meirelles Antonio Salatino Multidisciplinaria (Ciencias Naturales y Exactas) cerrado alkanes caatinga triterpenoids water diffusion The effects of the contents and chemical composition of the foliar epicuticular waxes of species from thecaatinga (Aspidosperma pyrifolium, Capparis yco, Maytenus rigida and Ziziphus joazeiro) and cerrado (Aristolochiaesperanzae, Didymopanax vinosum, Strychnos pseudoquina and Tocoyena formosa) were evaluatedas to the resistance to water loss by means of an experimental device constructed for this purpose. In general,the waxes of the caatinga species investigated were more efficient against water loss than cerrado species.Increase of the thickness of the waxy deposits from 40 to 90µ g.cm−2 had no significant effect on the resistanceto water loss. The chemistry of the wax constituents was shown to be an important factor to determinethe degree of resistance to evaporation. n-Alkanes and alcoholic triterpenes were the most efficient barriers,while hentriacontan-16-one (a ketone) and ursolic acid (an acid triterpene) revealed lowefficiency. The higherefficiency of the waxes of the leaves from caatinga species (mainly those of C. yco and Z. joazeiro) is probablyaccounted for the predominance of n-alkanes in their composition. The lower efficiency of the waxes of A.pyrifolium (caatinga), T. formosa and A. esperanzae (both species from the cerrado) is probably a consequenceof the predominance of triterpenoids in the waxes of the two former species and hentriacontan-16-one in thelatter. 2003 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32775403 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.4 Vol.75