Plant thermospermine-specific polyamine oxidases have a crucial role in vascular development and stem growth and were acquired from Metazoan(s) at non-vascular plant stage

ABSTRACT: Arabidopsis thaliana polyamine oxidase 5 gene (AtPAO5) functions as a thermospermine (T-Spm) oxidase. Aerial growth of its knock-out mutant (Atpao5-2) is significantly repressed by low dose(s) of T-Spm but not by other polyamines. Massive analysis of 3’-cDNA ends (MACE) was performed. Cell wall, lipid and secondary metabolisms were dramatically affected in low dose T-Spm-treated Atpao5-2. Intriguingly Fe-deficient responsive genes and drought stress-induced genes were up-regulated, suggesting that vascular system loses the function. Histological observation showed that vascular system of the joint part between stem and leaves was structurally destroyed. The results indicate that T-Spm homeostasis by a balance of synthesis and catabolism, catalysed by AtPAO5 in Arabidopsis, is important f

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Enrico Schleiff 

PROVIDER: E-GEOD-69510 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress