Editorial: Polyamines and longevity - role of polyamine in plant survival

Polyamines (PAs) are organic polycations involved in stress and developmental processes in plants (Gentile et al., 2012; Gupta et al., 2013). PAs occur in cells and tissues in free (non-conjugated) or conjugated forms by binding to various molecules, including DNA and RNA, proteins, and membrane phospholipids, thus regulating various molecular and cellular processes (Aloisi et al., 2017). In recent years, genetic and molecular evidence points to PAs as essential metabolites required for tolerance to biotic and abiotic stresses. As stress-protective compounds, PAs are involved in developmental processes mediated by specific signaling pathways or in cross-regulation with other plant hormones (Alcázar et al., 2010).