AGRONOMIC AND DROUGHT TOLERANCE EVALUATION OF DOUBLED HAPLOID RICE BREEDING LINES DERIVED FROM ANTHER CULTURE

Developing drought tolerant rainfed rice can be an alternative way to increase yield potential to achieve food security. This study aimed at selecting rainfed rice genotypes which were both high yielding and drought tolerant. Two experiments were conducted in Bogor, Indonesia in the wet season of 2016 and 2017. Two check varieties namely Ciherang and Inpari 18 and twenty eight doubled haploid lines were used for evaluating agronomic characters. The doubled haploid lines and two check varieties namely Salumpikit (drought tolerant check) and IR 20 (drought sensitive check) were used for screening at seedling stage. Both experiments were arranged using a randomized complete block design with three replications. The result revealed that there were four lines namely CG-8-18-1-2 (6.2 t/ha), CG-7-721- 1 (4.9 t/ha), CG-8-18-1-1 (5.5 t/ha), and CG-7-72-1-6 (4.7 t/ha) had higher yield than Ciherang (3.6 t/ha) and Inpari 18 (3.3 t/ha) under optimum field conditions and were tolerant to drought. These lines showed good agronomic characters: medium plant height, high number of total tillers, medium day to harvest, and high yield. These genotypes need to be further evaluated under rainfed lowland with drought stress conditions.