الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Wherever plants grow, they are subject to a great variety of stresses tending to restrict their chances of development and survival. High temperature is considered as one of the most ecological factors which limits the plant growth and production through its adverse effects on physiological and biochemical processes in plant cells. However, the physiological response of plants to heat stress varies according to time of exposure to high temperature. In this study, Zea mays (triple hybrid 310) was chosen due to its valuable economic importance as a food crop in Egypt and worldwide. Zea mays grains were surface sterilized and soaked for 12h in sterile distilled water then grown in pots filled with acid-washed quartz sand. The pots were irrigated with distilled water. The water field capacity was adjusted for 80 % throughout the investigation.