Author(s):

Satish Kumar, Rajeev Kumar, Pankaj Kumar and Santosh Kumar Singh

Abstract: Micronutrients are essential for human health and crucial for plant survival. Increasing temperature and heat are major abiotic stress which limits yield and nutritional quality of wheat. The objective of study to evaluate the effect of heat stress on micronutrient (Fe & Mn) accumulation in 18 wheat varieties at two phenological stages (Booting and grain filling).Pot experiments were conducted in randomized block design with three replications during rabbi 2012-13 at DRPCAU, Pusa, Bihar. Results showed the accumulation of micronutrient under heat stress in booting and grain filling decreased significantly in flag leaf and spike but some varieties enhances the accumulation of micronutrients under heat stress condition significantly. The wheat variety namely AKAW4189-3, MonsAld’s, Iepacarabe, PBW343, Pusa gold, AKAW4008 and Halna are good accumulator for Fe in flag leaf and varieties PBW343, HD2888, Kauz-dwarf, HD2733, F5-995, Iepacarabe, and AKAW4008 increased accumulation in spike. Maximum iron accumulation under stress condition recorded in variety AKAW4189-3 (252.33 ppm) in flag leaf and PBW343 (239.73 ppm) in spike. The enhanced Mn accumulation under high temperature was observed in flag leaf of variety namely AKAW4008, Pusa gold, Iepacarabe, F5-995, MonsAld’s, and Raj 3765 respectively whereas, AKAW 4008, AKAW4189-3, PBW343, C306, HD2285, HD2888, MonsAld’s and Sonalika has good accumulation property of Mn in spike. Variety namely F5-995 (32.57 ppm) and PBW343 (28.46 ppm) show good accumulation of manganese under stress condition in flag leaf and spike respectively. The wheat variety AKAW 4008, F5-995, PBW343,HD2888, MonsAld’s and AKAW4189-3 showed overall better micronutrients accumulation in flag leaf and spike under stress condition and appeared as potentially important wheat variety used in plant breeding and biofortification strategy to reduce the problem of malnutrition.

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