For all organisms heat means a state of stress and thus also for plants like the Weinrteb, The rising temperatures in the course of the climate change lead to lower productivity of important crops. Heat brings the cell metabolism out of balance and affects the photosynthesis, which is almost stopped at over 40 ° Celsius. Extreme heat can even kill plants. For these reasons, plants have developed a variety of reaction mechanisms. Just as humans try to protect plants from heat by evaporation, which leads to a relatively quick cooling. This as evaporation designated process is through the gap openings of the leaves controlled.
In conjunction with lower humidity, dry wind and strong sunshine, but it comes in addition to it water stress, As temperatures rise, so does the respiration in which the malic acid is decomposed. The result is low in color and low in acidity as well insipid tasting wines. The new breed heat tolerant varieties gains in importance in the context of these developments. To study the heat reactions of plants, the cress (Arabidopsis) is often used. The genome of this plant is comparatively simple and already completely decrypted. See also below drought,