Rapid accumulation of NO regulates ABA catabolism and seed dormancy during imbibition in Arabidopsis

Yinggao Liu, Jianhua ZHANG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Nitric oxide's (NO) involvement in breaking seed dormancy has been demonstrated in previous research but its action mechanism remains to be clarified. We observed that a rapid accumulation of NO induces an equally rapid decrease of abscisic acid (ABA) that is required for the NO's action in Arabidopsis. In addition, the NO-induced ABA decrease correlates with the regulation of CYP707A2 transcription and the (+)-abscisic acid 8'-hydroxylase (encoded by CYP707A2) protein expression. By analyzing cyp707a1, cyp707a2 and cyp707a3 mutants, we found that CYP707A2 plays a major role in ABA catabolism during the first stage of imbibition. Fluorescent images demonstrate that NO is released rapidly in the early hours at the endosperm layer during imbibition. Evidently such response precedes the enhancement of ABA catabolism which is required for subsequent seed germination.

Original languageEnglish
Pages (from-to)905-907
Number of pages3
JournalPlant Signaling and Behavior
Volume4
Issue number9
DOIs
Publication statusPublished - 2009

Scopus Subject Areas

  • Plant Science

User-Defined Keywords

  • (+)-abscisic acid 8′-hydroxylase
  • ABA
  • CYP707A2
  • Germination
  • Nitric oxide (NO)
  • Seed dormancy

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