Whether photosynthetic capacity completely recovers after rewatering depends on the drought-resistance of different species [ 3, 15- 17].
Although definitions vary depending on the context, drought is generally an extended period of months or years in which precipitation is less than the annual average and results in severe water scarcity (Wilhite 2000; Downing and Bakker 2000; Whetherald and Manabe 2002).
Depending on the region, drought can cause serious problems in humans through famine and later malnutrition, in addition to the death of livestock, alteration of the area's wildlife, and acceleration of deforestation.
At 10 days after the initial drought treatment, the plant height showed varying degrees of reduction depending on the severity of drought treatment, from very slight to extremely severe.
"Depending on how the drought goes, we need to balance their needs with our customers' needs," she said.
In this context, many studies reported alterations on relative water contents of various crop plants depending on the duration of applied drought (Alexieva et al. 2001; Bai et al. 2006; Keyvan 2010; Saeidi and Zabihi-e-Mahmoodabad 2009).
Indeed, both scenarios (tolerance and avoidance) are important drought adaptation strategies that could be used in breeding programmes depending on the environmental conditions targeted and drought status.
These results indicate that EMFs are involved in mediating divergent responses of beech to drought depending on the light availability.
However, the effect depends on whether the drought is "normal" or the beginning of "a long arid period".
Drought responses vary depending on the duration and intensity of the stimulus and comprehend protective alterations and long term growth changes [ 13].
