Author(s):

Amit Kumar, Dr. A Hemantaranjan, Vandana Kumari and Ranjan Kumar Chaubey

Abstract: We assessed thiourea spray treatment of three different concentrations 0.5mM, 0.6m M and 0.7mM was given only once at 40 days after sowing to variety HUW 468 at timely and late sowing conditions. Observations were taken on upper fully expanded leaves for recording different physiological, biochemical observations at 10, 20 and 30 days after thiourea spray i.e. 50, 60 and 70 days after sowing and yield parameters were recorded at harvest. Highest percent decrease in membrane stability index (MSI) of HUW468 was noticed at 70 DAS under third date of sowing (Dec 25) as compared to the normal sowing. The highest increase in chlorophyll (23.08%) was noticed with 0.6mM thiourea at 70 DAS in HUW 468. There was slight decrease in protein content at different days after sowing OF HUW-468 under normal as well as late sowings. There was not much change in phenol content at different days after sowing of HUW-468 under normal as well as late sowings in all the three genotypes. No change in the phenol content significantly in all the three genotypes under normal as well as very late sowing. Spray of thiourea resulted in small increase in the peroxidase activity in all the three genotypes under normal, late and very late sowing, and the maximum increase was noticed with 0.6mM thiourea. Highest increase was seen under normal sowing at 70 DAS.

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