The gibberellic acid signaling repressor RGL2 inhibits Arabidopsis seed germination by stimulating abscisic acid synthesis and ABI5 activity.

@article{Piskurewicz2008TheGA,
  title={The gibberellic acid signaling repressor RGL2 inhibits Arabidopsis seed germination by stimulating abscisic acid synthesis and ABI5 activity.},
  author={Urszula Piskurewicz and Yusuke Jikumaru and Natsuko Kinoshita and Eiji Nambara and Yuji Kamiya and Luis Lopez-Molina},
  journal={The Plant cell},
  year={2008},
  volume={20 10},
  pages={
          2729-45
        }
}
Seed germination is antagonistically controlled by the phytohormones gibberellic acid (GA) and abscisic acid (ABA). GA promotes seed germination by enhancing the proteasome-mediated destruction of RGL2 (for RGA-LIKE2), a key DELLA factor repressing germination. By contrast, ABA blocks germination by inducing ABI5 (for ABA-INSENSITIVE5), a basic domain/leucine zipper transcription factor repressing germination. Decreased GA synthesis leads to an increase in endogenous ABA levels through a… CONTINUE READING

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