Water stress-induced diurnal variations in leaf water relations, stomatal conductance, soluble sugars, lipids and essential oil content ofOriganum majoranaL.

The Use of Appropriate Cultivar of Basil (Ocimum basilicum) Can Increase Water Use Efficiency under Water Stress

“…Despite the fact that essential oil content was not affected by the irrigation level, essential oil yield was affected by year, irrigation, cultivar, and growth stages as it was increased from the first to the third stage. This is because there was an increase in dry weight, and the same response was found in other species [17,40,41,45]. In addition, in some species, it was found that water stress can increase the essential oil content, but in other species, there was no effect [17,40,41,45].…”

“…This is because there was an increase in dry weight, and the same response was found in other species [17,40,41,45]. In addition, in some species, it was found that water stress can increase the essential oil content, but in other species, there was no effect [17,40,41,45]. Also, essential oil yield can be affected in the same way [17,40,41,45].…”

“…This is a common response, as when plants are exposed to water stress, there is a decrease in growth rate and also in plant height [12,14,39]. In addition, in several other aromatic and medicinal plants, there was a decrease in plant height, like Origanum majorana [40] and Mentha arvensis [41] under water stress. The plant height that was found in the present study was much higher than other studies [12,42], which is because of the better conditions, and this was similar to other studies [35,36].…”

“…In addition, in some species, it was found that water stress can increase the essential oil content, but in other species, there was no effect [17,40,41,45]. Also, essential oil yield can be affected in the same way [17,40,41,45]. In the present study, the highest essential oil yield was found at Mrs Burns and followed by the cultivar Cinnamon because these cultivars had the highest dry matter and the essential oil content was not affected much by water stress.…”

Induction of stress volatiles and changes in essential oil content and composition upon microwave exposure in the aromatic plant Ocimum basilicum

“…The content of essential oil is often enhanced by several environmental stresses as a defense response as well as the result of changes in the balance between carbon use in growth and secondary metabolite production (Letchamo et al, 1995;Munne-Bosch et al, 1999;Zabaras et al, 2002;Blanch et al, 2007;Jiang et al, in press-a). However, severe environmental stresses, such as high and low temperature (Copolovici et al, 2012), drought Timmusk et al, 2014), alkalinity, salinity, UV stress and pathogen infection can overly reduce plant growth and photosynthesis rates (Ramakrishna and Ravishankar, 2011) and ultimately also the rate of production of secondary chemicals (Rhizopoulou and Diamantoglou, 1991;Yani et al, 1993;Llusià and Peñuelas, 1998;Blanch et al, 2007).…”