Involvement of superoxide radical in signal transduction regulating stomatal movements

Sadhna Purohit, G. Pradeep Kumar, Malini Laloraya, Manmohan M. Laloraya

Research output: Contribution to journalArticle

16 Scopus citations


Stomatal movements are regulated by alternate phase transition in the lipophilic domains of membrane initiated by blue light through activation of plasmalemma redox system. ABA blocks the blue light activated redox reactions leading to the accumulation of superoxide (O·- 2) radical inducing melting of the membrane and increased fluidity. Phenolic compounds which reverse the ABA effects reduce O·- 2 radical and thereby reverse phase transition in lipophilic domains of membrane. Stomatal movements thus appear to be regulated by blue light activated redox reactions involving formation of O·- 2 radical and its reduction by the reducing equivalents available in the GCPs.

Original languageEnglish (US)
Pages (from-to)30-37
Number of pages8
JournalBiochemical and Biophysical Research Communications
Issue number1
StatePublished - Nov 30 1994
Externally publishedYes


ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this