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In the phylogeny of plant polyamine oxidases (PAOs), clade III members from angiosperms, such asArabidopsis thaliana PAO5 andOryza sativa PAO1, prefer spermine and thermospermine as substrates and back‐convert both of these substrates to spermidine in vitro. A clade III representative of lycophytes, SelPAO5 fromSelaginella lepidophylla, also prefers spermine and thermospermine but instead back‐converts...
It is well known that changes in abiotic conditions such as the concentration of ions, temperature and humidity lead to modulation of polyamine contents in plants. However, little is known about the relevant parts these polyamines play in abiotic stress responses. Here we addressed a specific role of spermine during high salt stress using an Arabidopsis double knockout-mutant plant (acl5/spms) which...
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