Evaluación de la tolerancia a la salinidad en poblaciones segregantes F5 de arroz (Oryza sativa L.)

Abstract

The tolerance to salinity of advanced rice lines F₅ was evaluated in segregating populations derived from interspecific crosses between Oryza sativa L. ssp. japonica x Oryza rufipogon G. and of japonica type line crosses; through physiological indicators. 30 accessions were tested in two environments (0,2 and 7,0 dS / m). In this analysis, the differences between the dry matter yield under optimal conditions and the yield under stress conditions (salinity) were considered, to select the most tolerant genotypes, 8 tolerance indices were evaluated: relative reduction percentage (RR%), salinity susceptibility index (SSI), salinity intensity index (SII), mean productivity (MP), geometric mean productivity (GMP), stress tolerance (TOL), salinity tolerance index (ITS) and intensity of stress (IS). According to Pearson's correlation, the most adequate indices to identify salinity-tolerant genotypes were: RR%, MP, GMP, and ITS. The Salinity Tolerance Index (ITS), selected the genotype Puyón / JP003P11-103115 (7) as tolerant and the lines Puyón / JP002P8-30552 (6) and Puyón / JP002P8-294930 (11) as moderately tolerant to saline stress.