Resumen

DELLAMICO, C. J. M; MORALES, D  y  POLON, R. Inducción de respuestas adaptativas en el arroz (Oryza sativa L.) para su cultivo en condiciones de salinidad moderada. cultrop [online]. 2008, vol.29, n.4, pp. 61-66. ISSN 0258-5936.

This research work was aimed at improving salt tolerance of rice plants by means of osmo/haloconditioning treatments, inducing its natural capacity to get adapted under adverse conditions and to be considered as an acquired tolerance. Two trials were conducted with J-104 cv. seedlings. The first one proved method viability, besides evaluating crop growth and biomass partitioning in young plants. The second one recorded the effect of the same adaptative treatments on plant response under salinity conditions (soil electrical conductivity EC=4.8 m.s.cm-1 considered as moderately saline). After 105 days of transplanting, stem length, leaf number as well as biomass partitioning of the aerial part and root were measured in 10 plants per treatment. Yield (panicle number per m2, 1000-grain weight and grams per m2) was evaluated in 20 plants per treatment. Results suggest these treatments are capable of inducing certain homeostatic stability in plants to develop and yield adequately under a moderately saline medium; thus, it would be interesting to prove through studying the physiological crop responses, since the adaptation to saline medium, although by purely osmotic pre-treatments, involves a greater salt ion accumulation in young leaf tissues, which supposes a much more efficient osmotic adjustment and a greater salt tolerance.

Palabras clave : Oryza sativa; salinity; osmosis; adaptation; salt tolerance; induced resistance.