Grain yield stability analysis of Jembar local rice mutant lines generated from mutation breeding

Abstract

In breeding program to successfully develop cultivars that are well-adapted to growing regions. it is fundamental that candidate promising lines are tested in across different environments and that the data are analysed for grain yield stability. The objective of this study was to determine the stability parameters of grain yield of rice mutant lines across sixteen different environments and to select lines having wide and/or specific adaptation to environment. The research was conducted from January 2013 until January 2014 at the lowland rice experimental station under diverse environments at sixteen locations. The experiment used randomized complete block design (RCBD) with three replications. The 21-day-old seedlings were planted with spacing of 25 cm x 25 cm with a plot size of 4 m x 5 m. The ten promising rice mutant lines and two rice varieties (Jembar and Ciherang) as parents control were used in this experiment for multi-location yield trials. Yield stability of genotypes was estimated by using regression lines proposed by Finlay and Wilkinson. The result of yield stability analysis indicated that five mutant lines were OBS 1901/Psj, OBS 1904/Psj, OBS 1906/Psj, OBS 1907/Psj, and OBS 1908/Psj having wide adaptability to the environment. All rice mutant lines had highest yield compare than parent and check varieties with mean yield ranged from 7.54 t ha-1 to 7.89 t ha-1. Finally, regarding both mean yield and most of stability characteristics, genotypes OBS 1901/Psj and OBS 1908/Psj were found to be the most stable genotypes.