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A limiting factor in wheat production in many countries is the occurrence of temperature stress at grain filling stage especially in West Asia and North Africa. In about 40% temperate environments constituting 36 million hectares, terminal heat stress is a major threat. Keeping in view this threat present investigations were made to explore sources of heat tolerance and its genetics.100 genotypes of wheat were screened in a plastic tunnel for heat tolerance by providing them heat stress at the time of anthesis. Selection of the genotypes was based on grain weight, number of grains per spike...

Bread wheat (Triticum aestivum L.) is a major food crop in the world and a staple food of Pakistan which plays a remarkable role in meeting the food requirements of the country.Worldwide wheat provides nearly 55% of the carbohydrates and 20 % of the food calories consumed globally. Most of the wheat is growing for human consumption and about 10 % is retained for seed and industry. On the world basis it ranks after rice providing chief protein and caloric requirements for one third of the world population and is consumed in a variety of ways.At present though the production of wheat...