PJB-2023-422
Responses Of Wheat Genotypes Under Polyethylene Glycol (Peg) Induced Drought During Germination And Early Seedling Growth
Mst Masuma Akhter
Abstract
Water scarcity is a critical environmental constriction that negatively affected wheat growth, development and yield in Bangladesh. Identification of drought tolerant genotypes/lines is crucial at the initial stage of plant growth i.e. germination seedling growth stages. To cater this issue, 30 wheat genotypes/lines were treated with polyehelene glycol (PEG 6000) induced drought stresses of 0, -2.0 and -4.0 Mpa (osmotic stresses) and tested at the germination and seedling growth stages at the laboratory of the Department of Crop Physiology and Ecology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh. The experimental set up was Completely Ramdomized Design (CRD) with five replications. The results revealed that the rate of germination (RG) among the genotypes varied significantly with the different water potential levels, and the RG decreased with the advancement of stress. The stress tolerance index (STI) values based on RG were > 0.900 in wheat cultivars of Shatabdi, BARI Gom 25, E 2, E 18, E 30, E 34, E 38, BAW 1118, BAW 1151 and BAW 1161 under severe water deficit stress, while the values were < 0.800 in wheat genotypes BARI Gom 26, BARI Gom 27, BARI Gom 28, E 28, E 42, BAW 1130, BAW 1140, BAW 1143 and BAW 1168. The co-efficient of germination (COG) was significantly decreased with increasing water potential stresses (-2 & -4 bars), and the genotypes Sourav, BARI Gom 25, E 2, E 18, E 23, E 29, E 34, E 38, BAW 1118, BAW 1135, BAW 1151, BAW 1157, BAW 1161, BAW 1163, BAW 1170 and BAW 1171 showed > 0.980 STI values whereas, BARI Gom 26, BARI Gom 27, E 24, E 28, E 42, BAW 1130, BAW 1140 and BAW 1168 produced < 0.970 STI values under higher water potential. Higher STI values (> 0.920) regarding the germination vigour index (GVI) under higher water stress were observed in BARI Gom 25, E 18, E 23, E 34, E 38, BAW 1118, BAW 1161 and BAW 1170, and very lower STI values (< 0.800) were obtained in the Shatabdi, BARI Gom 26, BARI Gom 27, E 3, E 24, E 28, E 42, BAW 1130, BAW 1140 and BAW 1168 genotypes. The genotypes Shatabdi, BARI Gom 25, E 18, E 38, BAW 1118, BARI Gom 27, E 24, E 34, BAW 1143 and BAW 1170 showed higher STI values (> 0.550) indicating tolerant genotypes and the genotypes Sourav, BARI Gom 26, BARI Gom 28, E 2, E 3, E 28, E 29, BAW 1130, BAW 1151, and BAW 1168 demonstrated lower STI values (< 0.450) designating susceptible genotypes. The shoot weight (g) was reduced with the increment of water deficit stress. Wheat genotypes Shatabdi, BARI Gom 25, E 18, E 34, E 38 and BAW 1118 provided > 0.700 STI, while genotypes BARI Gom 26, E 2, E 23, E 29, BAW 1130, BAW 1140, BAW 1151, BAW 1157 and BAW 1161afford STI < 0.550. The genotypes showing higher and lower STI values denoted water stress tolerant and susceptible genotypes, respectively.
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