Remobilization of photoassimilates a strategy to deal with drought stress in wheat

Wheat is the first cereal and the most important crop in the world, and due to the increasing population growth, its production is expected to increase every year. Meanwhile, Iran is considered to have a Mediterranean climate and is part of the arid and semi-arid regions of the world due to its geographical location. Under the Mediterranean climate, grain filling of wheat and other cereal usually occurs when the average temperature of the environment increases and the amount of available moisture is reduced, which would disrupt the photosynthesis and reduce the production of photoassimilates during the current photosynthesis process. However, at the same time, the demand for photosynthetic materials for grain filling and also demand for respiration of the live biomass of plant increases, and current photosynthesis does not respond to them. Therefore, the carbon needed to fill the growing grains is provided from other carbon-based sources, such as the remobilization of stored carbohydrates in the stem internodes before anthesis stage. Therefore, studying the factors affecting the transfer of photoassimilates from different parts of the plant, can provide us with a solution that can be used more effectively to reduce the damage to drought stress and the optimal yield of wheat.