Phytohormone-regulated beta-amylase gene expression in rice

Plant Mol Biol. 1996 Aug;31(5):975-82. doi: 10.1007/BF00040716.


The expression of beta-amylase genes in rice (Oryza sativa) and its regulation by phytohormones gibberellic acid (GA) and abscisic acid (ABA) were examined. Upon germination beta-amylase is synthesized de novo in aleurone cells and (GA) is not required. Exogenous addition of GA does not enhance the beta-amylase activity, while ABA inhibits the beta-amylase activity, mRNA accumulation, and the germination of rice seeds. GA can reverse ABA inhibition of beta-amylase expression, but not ABA inhibition of seed germination. Such regulation represents a new interaction of ABA and GA.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Abscisic Acid / pharmacology*
  • Edible Grain / genetics
  • Gene Expression Regulation, Enzymologic
  • Gene Expression Regulation, Plant*
  • Germination / drug effects
  • Gibberellins / pharmacology*
  • Oryza / drug effects
  • Oryza / enzymology
  • Oryza / genetics*
  • Plant Growth Regulators / pharmacology*
  • RNA, Messenger / analysis
  • beta-Amylase / biosynthesis*
  • beta-Amylase / genetics


  • Gibberellins
  • Plant Growth Regulators
  • RNA, Messenger
  • Abscisic Acid
  • gibberellic acid
  • beta-Amylase