Author(s):

MK Rathod, RW Bharud and SS Kakde

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).

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