Expression profile of seven polyamine oxidase genes in rice () in response to abiotic stresses, phytohormones and polyamines.

Unlabelled: Polyamine levels are controlled by biosynthesis, intra- and inter-cellular flux by the respective transporters, and catabolism. The catabolism is catalyzed by two groups of enzymes. One is copper-containing amine oxidases and the other is polyamine oxidases (PAOs). In , seven genes exist and they are termed as to . However, their physiological function has not been elucidated yet. Here, we examined the expressional changes of seven genes upon abiotic and oxidative stress, phytohormone, and exogenous polyamines application. The transcript of extracellular polyamine oxidase and are strongly induced upon wounding, drought, salinity, oxidative stress (HO), and exogenous application of jasmonic acid, spermidine, spermine, thermospermine and negatively regulated upon indole acetic acid, isopentenyl adenine (iPT), gibberellic acid (GA), abscisic acid; is to iPT, GA and all polyamines; and are mildly responsive to heat, cold, oxidative stress. These results suggest that polyamine oxidase encoding extracellular enzyme may play a pivotal role during exogenous stimulus to protect the plant cell.

Supplementary Information: The online version contains supplementary material available at 10.1007/s12298-021-01006-1.