Simultaneous Selection of Rice Genotypes Tolerant to Anaerobic Germination

Abstract

Farmers mainly cultivate direct seeding in rainfed and swampy areas, which flood stress occurs. This stress causes the ability of coleoptile seeds to grow are inhibited, and only the genotype that is tolerant to anaerobic stress conditions in the germination phase (anaerobic germination-AG) can grow well. The study aimed to select rice genotypes based on yield, AG tolerance, and resistance to pests and diseases. The material used was 25 rice genotypes of rainfed lowland. The research consisted of yield trials, screening of main pests and diseases, and screening anaerobic germination stress. All trials were conducted in 2017. The results showed ten genotypes with yields above 6.5 t ha-1, not significantly different to the best check Inpari 39. Nine genotypes were resistant to brown planthoppers, 19 genotypes were resistant to bacterial leaf blight, and some genotypes were resistant to some races of blast. Screening of AG stress showed that four genotypes had growth percentage and shoot elongation not significantly different to AG tolerant check. Based on the simultaneous selection, it was selected 11 genotypes to continue to evaluate in the multilocation yield trial, which were BP20106C-SKI-3-1-0, IR83142-B-49-B-IND, IR 83381-B-B-6-1, IR 83376-B-B-130-3, IR 129336:11-19-Ski-0-Kn-3, IR 129336:11-8-Ski-0-Kn-8, IR 129336:11-8-Ski-0-Kn-11, B14316E-KA-15, and B14864E-SKI-7-6-2.