Resumen

GARCIA, Marina  y  JAUREGUI, Damelis. Efecto de la salinizacion con NaCl o Na2SO4 sobre la anatomia foliar en dos genotipos de caña de azucar (Saccharum spp.) con tolerancia salina diferencial. Ernstia [online]. 2008, vol.18, n.1, pp.089-105. ISSN 0252-8274.

The foliar anatomy in two genotypes of sugarcane with different salt tolerance PR692176 (salt tolerant) and V78-1 (salt sensitive) was studied with the objective to determine structural characters related with the differential response. The plants were grown on an artificial substrate irrigated with nutritive solution and after two months were treated with NaCl or Na2SO4 for sixty days. This investigation was performed with portions of the middle third of blade of the most recently expanded leaf blade, which were fixed and were processed in the usual way for optical microscope study. The response of the genotypes was different in the treatment with NaCl in PR692176 this salt caused increment in succulence, but not in V78-1, while Na2SO4 induced a great reduction in the size of the epidermal cells and the mesophyll in both genotypes. PR692176 showed the highest values of cuticle thickness, stomatal density and microhair density, as wells as a lower mean interveinal distance in relation to V78-1 this may represent a benefit for first genotype in relation to its capacity to deal with the effect of hidric stress caused by salts, contributing to explain its tolerance to salinity.

Palabras clave : Anatomy; leaf; Saccharum; salt.