Response of selected sorghum lines to soil salinity-stress under field conditions
2005
Ramesh, S | Reddy, B V S | Reddy, P S | Hebbar, M | Ibrahim, M
Forty-two sorghum lines, selected from 100 breeding lines evaluated for biomass production under salinity stress (electrical conductivity of ECe of 23.4 dS/m) in a pot experiment, were evaluated for yield and yield components under saline (ECe of 8.0 dS/m) conditions in Gangavathi, Karnataka, and under normal (non-saline) conditions in Patancheru, Andhra Pradesh, India, during the rainy season of 2004. The entries consisted of 24 hybrid parents (15 maintainer lines and 9 restorer lines), 16 cultivars, one hybrid and one salinity-sensitive control. Significant genetic variation for number of days to 50% flowering (70-92), plant height (1.0-2.7 m) and grain yield (0.50-3.9 t/ha) under saline conditions was observed. Delayed flowering, reduced plant height and grain yield, and poor agronomic performance and stay-green scores were some of the responses of the cultivars to soil salinity. The highly significant variation in phenotypic and genetic coefficients of variation indicated the significanteffects of the environment on grain yield and other traits under salinity. Under saline and normal conditions, ICSV 112 (3.4 and 6.5 t/ha), S 35 (3.1 and 5.6 t/ha), JJ 1041 (2.9 and 6.9 t/ha) and PSH 1 (3.4 and 5.9 t/ha) produced high grain yields. The maintainer lines and restorer lines were comparable in terms of grain yield; the cultivars were superior to hybrid parents with regard to this trait.
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