Regulation of the gibberellin pathway by auxin and DELLA proteins

We investigate the relationships between auxin and DELLA regulation of the GA pathway in stems, using a pea double mutant that is deficient in DELLA proteins

Damian P. O’Neill; Sandra E. Davidson; Victoria C. Clarke; Yukika Yamauchi; Shinjiro Yamaguchi; Yuji Kamiya; James B. Reid; John J. Ross

2010

Scholarcy highlights

  • The synthesis and deactivation of bioactive gibberellins are regulated by auxin and by GA signalling
  • We investigate the relationships between auxin and DELLA regulation of the GA pathway in stems, using a pea double mutant that is deficient in DELLA proteins
  • In general terms our results demonstrate that auxin and DELLAs independently regulate the GA pathway, contrary to some previous suggestions
  • For Mendel’s LE gene no counteraction was observed. For another synthesis gene, a GA 20-oxidase, the effect of auxin was weak and in WT plants appeared to be completely over-ridden by DELLA regulation
  • For a key GA deactivation gene, PsGA2ox1, the up-regulation induced by auxin deficiency was reduced to some extent by DELLA regulation
  • Monitoring the metabolism pattern of GA20 showed that in Arabidopsis, as in pea, auxin can promote the accumulation of bioactive GA

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