Om Prakash Godara1, B.L. Kakralya1, *Sunil Kumar2, Vikram Kumar2 and Rajesh Kumar Singhal3

1Department of Plant Physiology, S.K.N. College of Agriculture, Jobner, SKN Agriculture University, Jobner, India. 2Department of Agronomy, IAS, BHU, Varanasi – 221005, India. 3Department of Plant Physiology, IAS, BHU, Varanasi – 221005, India.

Received on 13 August 2016 and accepted on 11 October 2016



A field experiment was conducted at Agronomy Farm, S.K.N. College of agriculture, Jobner, Jaipur, Rajasthan to evaluate the effect of sowing time, varieties and salicylic acid (SA) application on different physiological parameters (i.e. relative water content, photosynthetic rate, transpiration rate, stomatal conductance, leaf temperature, Membrane stability index, chlorophyll stability index, heat susceptibility index) of Indian mustard. The experiment was laid out in split plot deign and replicated thrice. The experiment consisted of three sowing dates [20th October (timely sowing), 15th November (late sowing) and 30th November (very late sowing)], two varieties [RGN-236, RGN-229] and four levels of Salicylic acid (Control, SA 50 ppm, SA 100 ppm and SA 150 ppm). Physiological traits like relative water content, photosynthetic rate transpiration rate, stomatal conductance, leaf temperature, chlorophyll stability index Content, heat susceptibility index and membrane stability index are directly correlate with heat stress tolerance in crop plant. Results were revealed that effect of different sowing time, varieties and concentration of SA has shown significant effect on all tested physiological parameters of Indian mustard and those are associated with high temperature stress tolerance.


mustard, sowing time, varieties, salicylic acid, physiological parameters.