Influence of High Temperature on ?-amylase and Antixoxident Enzymes in Wheat (Triticum aestivum L.) Varieties

The study was conducted for two winter seasons during 2006-07 and 2007-08 at Student Instructional Farm of Narendra Deva University of Agriculture and Technology, Narendra Nagar (Kumarganj), Faizabad using 15 wheat (Triticum aestivum L.) varieties (Halna, Raj 3765, NW 1014, PBW 343, HD 2643, HP 1744, NW 2036, DBW 14, NW 1076, Sonalika, HD 2285, HD 2307, K 8962, UP 2425, and HP 1633) and three sowing dates 10^th December (NS), 25^th December (LS₁) and 10^th January (LS₂) to assess the relative efficiency of different selection parameters. There was significant increase in the activity of superoxide dismutase (SOD), peroxidase and calatase in the late and very late planting at all stages, however, α-amylase content activity decreased under late and very late planting compared to normal planting.