Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2002.36.39BiswasJiban Krishna AndoHo SiddiqeeMuhammad Ali YasmeenRumena HossainShaikh Tanveer MahbubAbdulla Al 1200251Sprouted seeds of anoxia-tolerant rice genotypes (IR41996-50-2-1-3, IR50363-61-1-2-2, BR736-20-3-1, RP1669-1529-4254) were sown in the para-film sealed test tubes containing different acid solutions and were allowed to grow for 7 days at 30oC at pH5 and 7 in the dark. The variation in organic acid concentration for 50% growth inhibition (C50) of seedling attributes was evident. First leaf survival (%), and the growth of the other seedling organs could be improved in pH 7 for some genotypes. RP1669-1529-4254 showed a higher C50 value in acetic acid for pH 5 and in propionic acid and butyric acid for both pH 5 and pH 7. It appears that this genotype has more tolerance and wider adaptability than the others under oxygen depleted conditions. First leaf survival (%) was more tolerant as compared to first leaf length, plant height and root length. Among VFAs, propionic acid was the most toxic, followed by butyric and acetic acid.]]>Biswas, J.K., H. Ando and K. Kakuda,2001Oryza sativa L.) genotypes.]]>4786100Biswas, J.K. and M. Yamauchi,1997Oryza sativa L.) under lowland conditions.]]>382932Cho, D.Y. and F.N. Ponnamperuma,1971112184194Gotoh, S. and Y. Onikura,19711718Krishnasamy, V. and D.V. Seshu,198929904908Rao, D.N. and D.S. Mikkelesen,197769923927Takijima, Y.,196030521524Takijima, Y.,196410204211Yamane, I. and K. Sato,19702179101Yamauchi, M., A.M. Aguilar, D.A. Vaughan and D.V. Sishu,1993Oryza sativa L.) for direct sowing under flooded soil surface.]]>67177184Yamauchi, M. and J.K. Biswas,1997189145156Yamauchi, M., D.V. Aragones, P.R. Casayuran, P.C.S. Cruz, C.A. Asis and R.T. Cruz,200092275282Ponnamperuma, F.N.,1976pp: 18pp: 18Watanabe, I.,1984Yamauchi, M. and J.K. Biswas,19961996pp: 661671