biostudies-literatureZhang Jthe Vegetable Breeding Program of Sichuan ProvinceIntroduction and Breeding of New High-yielding VarietiesImagineNations9999https://www.ebi.ac.uk/biostudies/studies/S-EPMC9456136biostudies-literatureUnknown23(17)Polyamine oxidases (PAOs), which are flavin adenine dinucleotide-dependent enzymes, catalyze polyamine (PA) catabolism, producing hydrogen peroxide (H₂O₂). Several PAO family members have been identified in plants, but their expression in pepper plants remains unclear. Here, six PAO genes were identified in the 'Zunla-1' pepper genome (named <i>CaPAO1</i>-<i>CaPAO6</i> according to their chromosomal positions). The PAO proteins were divided into four subfamilies according to phylogenetics: CaPAO1 belongs to subfamily I; CaPAO3 and CaPAO5 belong to subfamily III; and CaPAO2, CaPAO4, and CaPAO6 belong to subfamily IV (none belong to subfamily II). <i>CaPAO2</i>, <i>CaPAO4</i>, and <i>CaPAO6</i> were ubiquitously and highly expressed in all tissues, <i>CaPAO1</i> was maiInternational journal of molecular sciencesGenome-Wide Identification of Polyamine Oxidase (PAO) Family Genes: Roles of <i>CaPAO2</i> and <i>CaPAO4</i> in the Cold Tolerance of Pepper (<i>Capsicum annuum</i> L.).PMC94561362021YFYZ0022SCCX2019-05Xu LLi HXie YZhang JZhou PSun BXue XLai YHuang ZXiao JZhu LRan JLiang LSun GTang YfalseGenome-Wide Identification of Polyamine Oxidase (PAO) Family Genes: Roles of <i>CaPAO2</i> and <i>CaPAO4</i> in the Cold Tolerance of Pepper (<i>Capsicum annuum</i> L.).Polyamine oxidases (PAOs), which are flavin adenine dinucleotide-dependent enzymes, catalyze polyamine (PA) catabolism, producing hydrogen peroxide (H₂O₂). Several PAO family members have been identified in plants, but their expression in pepper plants remains unclear. Here, six PAO genes were identified in the 'Zunla-1' pepper genome (named <i>CaPAO1</i>-<i>CaPAO6</i> according to their chromosomal positions). The PAO proteins were divided into four subfamilies according to phylogenetics: CaPAO1 belongs to subfamily I; CaPAO3 and CaPAO5 belong to subfamily III; and CaPAO2, CaPAO4, and CaPAO6 belong to subfamily IV (none belong to subfamily II). <i>CaPAO2</i>, <i>CaPAO4</i>, and <i>CaPAO6</i> were ubiquitously and highly expressed in all tissues, <i>CaPAO1</i> was mai2022-01-01T00:00:00Z2022 Sep2026-05-10T03:09:16.122Z2024-11-12T21:20:34.35ZS-EPMC94561363607739510.3390/ijms23179999