Abstract

LAMZ PIEDRA, Alexis  and  GONZALEZ CEPERO, María C. Indicators of initial growth and nutritional status for early selection genotypes of rice (Oryza sativa L.) salt tolerant. cultrop [online]. 2015, vol.36, n.2, pp.41-48. ISSN 0258-5936.

In order to identify possible indicators of initial growth and nutrition for early selection of rice genotypes tolerant to salinity, tests with two cultivars with different degree of salinity tolerance ('Pokkali' and 'Amistad-82') were developed under controlled conditions, saline solutions tailored to electrical conductivities (EC) of 8 and 12 dSm^-1 by the addition of NaCl and a control with distilled water. The percentage of germination at 15 days after sowing (DAS) and the growth parameters: plant height, root length, dry mass of the aerial part (MSPA), dry mass of the root system (MSSR) to 21 DAS were evaluates. Meanwhile, in leaves and roots of both cultivars under controlled conditions and using nutrient solutions for the simulation of salt stress (CE 8 and 12 dSm^-1), was determined at seedling stage, the content of nitrogen (N), phosphorus ( P ) , potassium ( K ), sodium ( Na ) , and sodium / potassium ratio. The results show a differential behavior of the cultivars in their degree of tolerance to salinity, allowing use some of the variables evaluated as indicators for discrimination of rice genotypes tolerant to salinity

Keywords : rice; salinity; growth; indicators.

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