Thermospermine is required for stem elongation in Arabidopsis thaliana.

  title={Thermospermine is required for stem elongation in Arabidopsis thaliana.},
  author={Jun-ichi Kakehi and Yoshitaka Kuwashiro and Masaru Niitsu and Taku Takahashi},
  journal={Plant & cell physiology},
  volume={49 9},
Loss-of-function mutants of the ACAULIS5 (ACL5) gene in Arabidopsis thaliana have severe defects in stem elongation. ACL5 was previously reported as encoding a spermine synthase. A more recent study, however, showed that the bacterial expressed recombinant ACL5 protein catalyzes the conversion of spermidine to thermospermine, a structural isomer of spermine, rather than to spermine. In the present study, we found that thermospermine was detected in wild-type seedlings but was not detectable in… CONTINUE READING
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