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Journal of Plant Growth Regulation

, Volume 8, Issue 4, pp 263–272 | Cite as

Relationship of indole-3-butyric acid and adventitious rooting in M.26 apple (Malus Pumila mill.) shoots cultured in vitro

  • Rafael Alvarez
  • Scott Nissen
  • Ellen G. Sutter
Article

Abstract

The role of indole-3-butyric acid (IBA) in adventitious root formation was studied by analyzing the uptake and subsequent metabolism of IBA in shoots of M.26 apple (Malus pumila Mill.) rootstock grown in vitro. Roots were induced by exposing shoots to 4 μM IBA and [3H]IBA for 5 days in the dark and then transferring them to plant growth regulator (PGR)-free medium in the light until roots formed. Approximately 50% of the total radioactivity applied was taken up from the agar medium by the shoots during the 5-day incubation period in IBA. Indole-3-butyric acid metabolism was studied by extraction and high-performance liquid chromatographic (HPLC) separation of [3H]IBA and metabolites from the basal sections of treated shoots. The major [3H]IBA metabolite co-eluted with authentic [14C]indole-3-acetic acid (IAA) suggesting that IBA was converted to IAA in the shoots. The proportion of newly synthesized IAA present as conjugates was higher at the end of the 5-day IBA treatment period than after 13 days in PGR-free medium. There appeared to be no conjugation of IBA at any time.

Keywords

Adventitious Root Root Induction Adventitious Root Formation Basal Section Rooted Shoot 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag New York Inc. 1989

Authors and Affiliations

  • Rafael Alvarez
    • 1
  • Scott Nissen
    • 1
  • Ellen G. Sutter
    • 1
  1. 1.Department of PomologyUniversity of CaliforniaDavisUSA

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