IDENTIFICATION OF SUBMERGENCE TOLERANT RICE GENOTYPES WITH REFERENCE TO LEAF PHYSIOLOGY

Abstract

TIll: experiment was carried out at the research farms and plant physiology laboratory of Sher-e-Bangla Agricultural University, Dhaka. Bangladesh during aman season of 2014 10 study the response of different rice genotypes to submergence conditions and identified submergence tolerance of arnan rice genotypes best on leaf physiological parameters. TIle experiment was conducted with three tolerant (ORRI dhan5:J. IR64Subl. FRI3A) and one susceptible genotype (BRS) with four submergence treatments (0. 7.14. and 21 days of submergence). TIle experiment was laid out in two factors randomized complete block design with four replications. Different leaf physiological processes were hampered due to submergence, The negative cllcct of submergence was increased with increasing submergence duration. But then: was genotypic variation in every submergence level. After desubmergencc the relative water content. stomatal conductance. transpiration rate, intercellular COl concentration, net assimilation rate and specific leaf weight were less affected in IlRRI dhan52 and FR I3A and were more affected in IR64Sub I and in UR5. Considering different physiological processes BRRI dhan52 showed 1I10r.: submergence tolerance compared 10 other genotypes,