SCREENING OF MUNGBEAN GENOTYPES UNDER PEG INDUCED DROUGHT STRESS CONDITION

Abstract

Ensuring food security for over growing population is a major challenge to the agriculturist. More over phenomena like abiotic stresses (especially drought) exert more challenges to fulfill the task. So, screening of drought tolerant crop could be a feasible means to fight the battle. Mungbean is a popular pulse crop in Bangladesh. Screening of drought tolerant mungbean genotypes is time demanding issues as the drought prone areas are increasing exponentially with times. To screen drought tolerance mungbean genotypes, germination, seedling growth, root shoot ratio, coefficient of germination, vigor index and water relation behavior were used as screening criteria. Sixteen mungbean genotypes viz. V 1 = BARI Mung 3, V 2 = BARI Mung 4, V 3 = BARI Mung 5, V 4 = BARI Mung 6, V 5 = BARI Mung 7, V 6 = BARI Mung 8, V 7 = BINA Mung 5, V 8 = BINA Mung 6, V 9 = BINA Mung 8, V 10

=BMXK 1 -09015-6, V 11 =BMX-08011-2, V 12 = BMX-08011-8, V 13 =BMXK 1 -090152,

V 14 =BMXK 1 -09012-1, V 15 =PM-5 and V 16 =IPM-02-03 were tested under 5 different PEG concentrations (0%, 5%, 10%, 15% and 20%) at central laboratory, Sher-e-bangla Agricultural University, Dhaka-1207, during February to March, 2018. The experiment was conducted with a complete randomize design (CRD) with 5 replications. The results of the experiment revealed that, germination, seedling growth and water relation behavior of mungbean genotypes varied significantly under different PEG concentration (Drought inducer). A marked reduction of germination, seedling growth and water relation behavior was observed with the increasing of PEG concentration for most of the mungbean genotypes except BINA Mung-6, BARI Mung-4 and BINA Mung-5. The maximum germination percentage (98.12%), root shoot ratio (0.55), relative water content (94.78), water retention capacity (24.98), coefficient of germination (22.27) and vigor index (233.90) were recorded from BINA Mung 6 at 0% PEG concentration. The minimum germination percentage (28.22%), relative water content (25.55), water retention capacity (3.08), coefficient of germination (6.06) and vigor index (13.45) were recorded from IPM-02-03 advanced lines of mungbean at 20% PEG concentration. The minimum root shoot ratio (0.20) at 20% PEG concentration was recorded from BARI Mung 5. BINA Mung 6, BARI Mung 4 and BINA Mung 5 showed consistently better performance against drought stress and there were slow linear reduction were observed with the increasing of PEG concentration from 0% to 20%. So considering the above results, BINA Mung 6, BARI Mung 4 and BINA Mung 5 could be promising drought stress genotypes against moderate drought stress condition.