Genetic variability in grain quality characteristics and yield in lowland rice genotypes

Grain quality characteristics of 20 promising rice genotypes were evaluated for twelve physico-chemical, quality traits and yield. Analysis of variance for all the characters indicated significant difference among the genotypes. The values of phenotypic and genotypic coefficient of variation were high for water uptake and yield. Heritability was very low in volume expansion ratio. Hulling (%) ranged from 71.6% to 79.7%. Milling (%) ranged from 63.4 to 76.7% in all the genotypes. Head rice recovery percentage (HRR %) varied from 50.4% to 72.8%. Highest length breadth ratio was observed in long slender genotypes like NDR 9830144, NDR 9830118 and NDR 9830124. Elongation ratio varied from 1.5 to 1.9 and highest was observed in Salivahan. Volume expansion ratio in all the genotypes were less than 4.0 and highest was 3.9 (IR 53945-35-B-3-2CR-1). Amylose content was in intermediate rang (18.7 to 25.6%). Alkali spreading value ranged from 4.0 (OR 1898-2) to 7.0 (OR 1550-26). Yield varied from 1.1 t ha-1 (RAU 1314-3-3-3) to 3.3 t ha-1 (NDR 9830144). Among the tested genotypes NDR 9830144 and TTB 292-426 were having desirable quality characteristics and therefore these genotypes may be used in quality improvement programme.