GROWTH, PHYSIOLOGY AND YIELD PERFORMANCE OF DIFFERENT WHEAT GENOTYPES UNDER VARIOUS WATER DEFICIT CONDITIONS

Abstract

A pot experiment was conducted to study the growth, physiology and yield performance of different wheat genotypes under various water deficit conditions at Sher-e-Bangla Agricultural University, Dhaka during the period from October 2019 to March 2020. The experiment consisted of two factors, and followed Completely Random Design (CRD) with four replications. Factor A: Wheat genotypes (4) viz; V 1 : BARI Gom-29, V 2 : BARI Gom-30,V 3 : BARI Gom-32 and V : BARI Gom-33 and and Factor B:Drought level (4) viz; D 0 4 : Control-3 times irrigation: crown root initiation (CRI) stage (17-21 DAS), flowering stage (50-55 DAS) and maturity stage (70-80 DAS); D : 2 times irrigation: crown root initiation (CRI) stage (17-21 DAS) and flowering stage (50-55 DAS); D 1 : 1 time irrigation: crown root initiation (CRI) stage (17-21 DAS); D 3 2 : no irrigation. Among different wheat genotypes BARI Gom32

(V ) performed better and recorded the highest 1000 grain weight (37.38 g) and grain yield plant 3 -1 (32.28 g). In case of different drought levels increasing drought levels significantly reduced relative water content, membrane stability index and chlorophyll content comparable to control treatment and the lowest grain yield (23.35 g plant -1 ) was recorded in D 3 treatment. The highest grain yield (36.18 g plant ) stover yield (20.80 g plant -1 ) and biological yield (56.99 g plant -1 ) was found in D

control treatment. In case of harvest index the highest was found in D (69.35 %) treatment. In case of Interaction cultivation of BARI Gom-32 (V ) and in absence of drought stress condition recorded the maximum grain yield plant 3 (38.50 g) comparable to other treatment Interactions. Increasing drought condition disrupted plant growth and development and the lowest grain yield (23.35 g plant ) was recorded inV 1 D Therefore, the growth and yield of wheat decreased with the increasing drought level, and cultivation of drought tolerance wheat genotype can be a suitable approach to tolerate drought stress condition in drought prone areas. 3. -1 3 -1 -1 0