Isoleucine is part of the subgroup of branched chain amino acids (in English they are called Branched-Chain Amino Acids BCAA), these amino acids serve as a substrate to synthesize many other metabolites. For example, leucine is a precursor of alcohols, and other compounds, which improve the organoleptic qualities of the fruits. In situations of abiotic stress, plants produce many branched chain amino acids (valine, isoleucine, etc.) that are used by the plant to synthesize stress response proteins. For example, a study conducted by the group for Arabidopsis (Nambara et al., 1998) shows that leucine concentration increases up to 150 times during droughts.