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Wheat (Triticum aestivum L.) is one of the most important Rabi cereals crop in all over the world. It is a thermo stable crop that is cultivated on latitudinal distribution (Sahu et al., 2002). Wheat is consumed by the human in all tropical and subtropical areas in developing as well as developed nations. It grows mainly 15-18 0 C optimum temperature (Chaudhary and wardlaw, 1978). But above temperature from particular temperature, it suffers the chronic heat tolerance during reproductive phase and vegetative growth. Main causes of high temperature are the global warming (Iba, 2002). Heat stress affected to the production of wheat in arid and semi-arid areas. So to consider these problems Wheat (Triticum aestivum L.) is one of the important cereal crops. It has the top first rank in among cereals because of which it has most significant contribution to the worldwide. Now day’s high temperature is continuing raising that affected to wheat crop. This temperature is risen by human activities and some other activities. Heat stress is an abiotic phenomenon that resulting the losses in yield. High temperature alters the primary phenomena such as growth and development and also affect to the physiological responses and biochemical aspects. So we need to develop heat tolerance variety that can give good yield performance during heat stress. This may be achieved by the knowledge of whole plant mechanism such as mechanism of heat tolerance with plants, morphological responses, anatomical responses, physiological responses and expression of gene. Now days most of the tool to be adopted is molecular marker to know the idea about mechanism of heat stress. Molecular marker system reveals idea about which one gene/ QTLs associated with heat tolerance. K e y w o r d s

Wheat Heat Tolerance: Mechanism, Impact and Quantitative Trait Loci Associated with Heat Tolerance