Lateral root formation in rice (Oryza Sativa L.): Differential effects of indole-3-acetic acid and indole-3-butyric acid

Shucai Wang, Shin Taketa, Masahiko Ichii, Langlai Xu, Kai Xia, Xie Zhou

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Comparative effects of indole-3-acetic acid (IAA) and indole-3-butyric acid (IBA) on lateral root (LR) formation were studied using 2-day-old seedlings of IR8 rice (Oryza sativa L.). Results showed that IBA at all concentrations (0.8-500 nmol/L) increased the number of LRs in the seminal root. However exogenous IAA, failed to increase the number of LRs. On the other hand, both IBA and IAA caused inhibition of seminal root elongation and promotion of LR elongation, but IAA can only reach to the same degree of that of IBA at a more than 20-fold concentration. Exogenous IBA had no effect on endogenous IAA content. We conclude from the results that IBA could act directly as a distinct auxin, promoting LR formation in rice, and that the signal transduction pathway for IBA is at least partially different from that for IAA.

Original languageEnglish
Pages (from-to)41-47
Number of pages7
JournalPlant Growth Regulation
Volume41
Issue number1
DOIs
Publication statusPublished - Sep 1 2003
Externally publishedYes

Keywords

  • Indole-3-acetic acid
  • Indole-3-butyric acid
  • Lateral root formation
  • Oryza sativa L.
  • Rice

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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