Screening of rice genotypes for submergence stress at seedling stage

Submergence tolerant rice varieties are essential for rainfed low land rice ecosystems which can obstruct the sudden rise of water level. Appropriate screening procedures are significant to select donor parents, having Sub1 genes for the development of submergence tolerance, high yielding rice varieties. The morphological screening was performed with 14 rice lines along with 4 check varieties at glass house of Bangladesh Institute of Nuclear Agriculture (BINA) for submergence tolerance in rice. To Evaluate the performance of rice genotypes under submergence condition, genotypes were completely submerged under 40 cm water for 24 days. Data was recorded at 7 days after sowing (DAS), 14 DAS and 24 DAS. The progenies RC193, BRRI dhan51 and Binadhan-11 performed maximum (99%) survival rate while these three genotypes secured 3 (tolerant) of submergence survival score (SES: 1-9) with the lower elongation rates viz. 13%, 46% and 49% respectively. RC-193 shown same survival rate with BRRI dhan51 and Binadhan-11. Even it performed lower elongation rates compared to these two well-known submergence tolerant rice varieties. So based on this evaluation, the line RC-193 was identified as submergence tolerant line and the line will be used as donor and crossed with recurrent parent to develop submergence tolerant rice variety.

Key words: Screening, genotypes, stress, seedling stage, submergence and rice.