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Selecting advanced rice lines (Oryza sp.) as an alternative for sustainable management of soils degraded by salinity

Abstract:

Research focuses on advanced lines developed through interspecific crosses between Oryza sativa L. ssp. japonica and Oryza rufipogon G. and the japonica type line were evaluated for salts tolerance under greenhouse and field conditions. In the greenhouse, 24 advanced F5 rice lines, five parental lines, and one commercial cultivar SFL-011 (control) were grown in a liquid medium at a concentration of 7.0 dS/m EC salinized with NaCl, and the control was evaluated at 0.2 dS/m EC irrigation water in the first phase. Under field conditions, F6 rice lines were assessed in saline soils with 7.44 dS/m EC in the second phase. Agronomic variables and yield were measured. In greenhouse conditions, six lines stood out: Puyón/JP003 P11-106716, Puyón/JP002 P8-30552, Puyón/JP003 P11-103115, Puyón/JP002 P8-294930, JP002/JP001 P × P 5P 1322, and JP001/JP003 P1 × 11P 413, with greater tolerance than the rice control, concerning plant vigor, panicles per plant, grains per panicle, the thousand-grain weight, and yield (g/plant). Under field conditions, two lines, Puyón/JP003 P11-106716 and Puyón/JP003 P11-103115 stood out for better agronomic cultivars and yields. The results showed the importance of interspecific crosses between O. Sativa ssp. japonica and O. rufipogon and the japonica type line to improve the tolerance to salinity of rice and ensure high potential yields in salinized soils.