Agents for increasing the stress defense in plants to abiotic stress and methods for their discovery

The invention relates to a method for the detection of compounds that modulate the tolerance of plants to acting on this plant abiotic stress factors such as temperature (such as cold, frost or heat), water (such as dryness, drought or anoxia), or the chemical load ( such as deficiency or excess of mineral salts, heavy metals, gaseous noxious substances) by increasing the expression of plant-increase proteins, as well as the use of these compounds to increase plant tolerance to abiotic stress.