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Heat stress

For all organisms, heat means a state of stress. Plants experience heat stress when exposed to high levels of sunlight. Heat throws cell metabolism out of balance and impairs photosynthesis, which virtually stops at temperatures above 40 °Celsius. Plants have developed a variety of reaction mechanisms to survive short periods of heat. The first phase of this phenomenon is known as photoinhibition (light inhibition).

Plants protect themselves from heat through evaporation transpiration, which leads to relatively rapid cooling. This process is controlled by the stomata (stomata) of the leaves. In combination with low humidity, dry wind and strong sunlight, this leads to additional water stress. There are plants that are particularly resistant (e.g. agaves and cacti), this is known as xerophily.

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26,427 Keywords · 47,031 Synonyms · 5,321 Translations · 31,760 Pronunciations · 207,740 Cross-references
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