Archive

Grouping of rice genotypes based on vigor index and speed of germinationfor salt toleranceat germination stage

DE Jharna, MA Hossain, BLD Chowdhury and MM Islam

Abstract

Salinity induced changes in vigor index and speed of germination were examined to screen out salt tolerant rice genotypes. A total of 127 rice genotypes including mostly traditional, cultivated in the coastal regions of Bangladesh and some improved genotypes were used in the study. The study was conducted in petridish with 0and 15 dS m-1 salinity. Salinity stress reduced the vigor index and speed of germinationof rice genotypes. But the extent of vigor index and speed of germination, varied with genotypes and levels of salinity. Generally in control condition vigor index and speed of germination was found higher and it gradually decreased with the increase of salt concentration. Based on decrease of vigor index at 15 dS m-1salinity, the genotypes Pengek, BRRI dhan40, BRRI dhan47, SadaMotaBashpai, Bashful Balam, Patnai, RajshahiBalam, KhokShail, JamaiNaru, Talmugur, Nonabokra, BR23, Talmuri, Khesrail, BRRI dhan41 and Pokkali scored 1 (highly tolerant), and the genotypes Lambo, Chenga, BhuteShalot, Gigojscored 9 (highly susceptible) to salinity.Regardingspeed of germination, the genotypes Bola Balam, Swarnadhan, PBRC-30, Swarnalata, Sadamota, DepaKolom, Kesa, Ghunshi-2, KoichaBinni, Nunia and Talmuri scored 1(highly tolerant), and the genotypesTilekKuchi, Orgoja, KhejureChori,MondeshorChenga, Mohime,, Nona Kochi scored9(highly susceptible).