PERFORMANCE OF DIFFERENT ABIOTIC STRESSES ON MORPHO-PHYSIOLOGICAL RESPONSES OF JUTE (Chorchorus capsularis) GROWN IN BANGLADESH

Abstract

Abiotic stresses like water logging or flooding, drought, excessive salinity, metal or metalloid toxicity causes serious injuries to environment and thus reduced the entire crop productivity. To investigate the morpho-physiological responses of deshi jute (CVL-1) under different abiotic stresses, two experiments were carried out during the period of April 2019 to June 2019 at the crop science laboratory, Sher-e-Bangla Agricultural University, Bangladesh. Experiment -I consists of total of six treatments considering salt stress (50, 75 and 100 mM NaCl) and Cadmium (Cd) stress (0.50 and 1 mM CdCl 2 ) . A total of nine treatments were used combined including salt stress (200 and 400 mM NaCl), Cd stress (2 and 4 mM CdCl 2 ), drought and waterlogging at seedlings and vegetative stage. All the stress treatments were applied at 15 days after sowing (DAS). Drought was imposed at 15 DAS continued for 10 days till 25 DAS at moderate drought stress condition whereas under severe drought stress drought was carried out for 15 days till 30 DAS. Waterlogging condition was maintained for 5 days at 15 DAS and 30 DAS while in other waterlogged condition 20 days of continuous waterlogged condition till 35 DAS was maintained to create waterlogged stress condition. Different germination parameter like germination percentage, mean germination time, root-shoot ratio, vigor index, survivability percentage, vigor value, co-efficient of velocity of germination, mean germination rate were measured. Results revealed that severe salt stress and cadmium stress showed significant effect on all the germination parameter. Physiological and biochemical parameter like plant height, leaf chlorophyll content, fresh weight (FW) and dry weight (DW) of different plant parts, leaf relative water content (RWC) along with MDA and H 2 content were measured. The examined results indicated that plant height, chlorophyll content, FW, DW and RWC of leaf remarkably decreased under drought and salt stresses both at seedling and vegetative stages compared to other stress conditions. However, under Cd and waterlogged stress plant showed comparatively better tolerance than the other stresses. Likewise, C. capsularis showed more positive response in waterlogged stress than the cadmium stress. The findings of the present study thus conclude that drought and salinity are the potential stresses that could hamper jute (Deshi pat) production seriously and recommended large scale, field level and nation wide further intensive researches.