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Polyamines (PAs) in plant play a critical role in growth and development and in response to environmental stress. Polyamine oxidase (PAO) is a flavin adenine dinucleotide dependent enzyme that plays a major role in PA catabolism. For the first time,  PAO  genes in tea plant were screened for the whole genome-wide and seven  CsPAO  genes were identified, which were named  CsPAO1-7 . Phylogenetic tree analysis revealed seven CsPAO protein sequences classed into three groups, including clade I, III, and IV. Compared with other plants, the tea plant lacked clade II members. Genetic structure and tissue specific expression analysis showed that there were significant differences among members of the  CsPAO  gene family. Among members of the  CsPAOs  family,  CsPAO4  and  CsPAO5  contain more introns and are highly expressed in various organizations.  CsPAO1 ,  CsPAO4 , and  CsPAO5  genes were cloned and expressed heterologously to verify theirs function. Heat map showed high response of  CsPAO5  to drought stress, while  CsPAO 1 and  CsPAO 2 were sensitive to changes in nitrogen nutrition. Furthermore, exogenous abscisic acid (ABA) treatment indicated that the expression of most  CsPAO  genes in roots and leaves was significantly induced. In the root, Spm content increased significantly, while Put and Spd content decreased, suggesting that ABA has great influence on the biosynthesis of PAs. Anaerobic treatment of picked tea leaves showed that the decomposition of PAs was promoted to a certain extent. The above data help to clarify the role of  CsPAO  in response abiotic and nitrogen nutritional stresses in tea plants, and provide a reference perspective for the potential influence of PAs on the tea processing quality.

Genome-Wide Identification of Seven Polyamine Oxidase Genes in Camellia sinensis (L.) and Their Expression Patterns Under Various Abiotic Stresses