It has been observed that water deprivation increase the expression of SL biosynthesis genes in Arabidopsis leaves [55], tomato shoots [76], and rice [77]. Interestingly, rice root extracts exhibited increased SL content under water deprivation, and the expression of the genes involved in SL biosynthesis was increased in both the roots and shoots of different species, such as in the crown of tall fescue (Festuca arundinacea) [78,79]. By contrast, osmotic stress represses SL biosynthesis in tomato [76], and Lotus japonicus roots