Effect of temperature stress on soybean [Glycine max (L.) Merrill] genotypes morphology

Abstract

Temperature is an environmental factor that has a considerable influence on crop morphology. It significantly affects the plant height, number of branches and leaves. A pot experiment was conducted at Central Phytotron Facility during 2017-2018 in Completely Randomized Block Design (CRD) with two replications. Twenty genotypes were exposed to various temperature regimes viz; control (T1), day/night temperature regime 30 0C/25 0C (T2), 32 0C/27 0C (T3), 34 0C/29 0C (T4), and 36 0C/31 0C (T5) under phytotronic conditions in growth chambers 1, 2, 3, 4, and 5 respectively. Five seeds per replication were sown in pots and were exposed to above temperature regimes and 10000 foot candle light and 1000 ppm CO2 was provided. Plant height is important and visible measure of plant growth. Among the genotypes DS-228 (30.89 cm) recorded significantly maximum plant height followed by JS-9305 (29.90 cm) while genotype KDS-980 (20.63 cm) recorded significantly minimum plant height at 30 DAE. Similarly at 60 DAE among the different temperature stress treatments, day/night temperature regime 32/27 0C treatment recorded significantly maximum number of leaves plant-1 (47.77) followed by day/night temperature regime 30/25 0C treatment (47.12) whereas day/night temperature regime 36/31 0C treatment recorded significantly minimum number of leaves plant-1 (46.27).