Endogenous indole-3-acetic acid and trans-zeatin ribosides in relation to axillary bud formation in standard chrysanthemum

Yeun Joo Huh, Jin Hee Lim, Sang Kun Park, Seung Ryul Choi, Seung Heui Kim, Chun Ho Pak

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The lateral buds of non-branching chrysanthemum cultivars are affected by temperature and exogenous plant growth regulator (PGR) treatment. The number of axillary buds, endogenous indole-3-acetic acid (IAA) and t-zeatin riboside (t-ZR) concentrations by planting date and PGR treatments were investigated in three genotypes. Two non-branching genotypes, 'Iwanohakusen' and '01B1-8' and branching type 'Jinba' were planted on May 2 and June 29. 'Jinba' always bore axillary buds and '01B1-8' showed stronger non-branching traits than 'Iwanohakusen'. Only 22.9% viable buds developed in the axils of '01B1-8' whereas 68.7% developed in 'Iwanohakusen' on the May 2 planting date group. When planting was delayed from May 2 to June 29, the number of axillary buds decreased in both non-branching genotypes. Endogenous IAA concentrations remained unchanged and t-ZR concentrations decreased in all the three genotypes when the planting date was delayed. This reduced t-ZR level corresponds to the increased ratio of IAA/t-ZR. The number of viable axillary buds increased from 21. 7% to 50.1% upon ethephon treatment and to 30.3% by synthetic cytokinin 6-benzylaminopurine (BAP) treatment in '01B1-8'. Viable axillary buds of '01B1-22' increased from 17.1% to 25.1% and 29.1% respectively. Ethephon and BAP application decreased endogenous IAA contents and increased t-ZR contents. Elevated concentrations of t-ZR rather than IAA probably account for axillary bud formation in non-branching chrysanthemum. Just as the non-branching genotypes, the branching type cultivar 'Jinba' showed similar changes in IAA and t-ZR contents according to planting date and exogenous PGR treatments. These results showed that genotypic difference of branching patterns is not a result of concentration-dependent reaction.

Original languageEnglish
Pages (from-to)128-132
Number of pages5
JournalHorticulture Environment and Biotechnology
Volume52
Issue number2
DOIs
Publication statusPublished - 2011 Apr 1

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Keywords

  • axillary meristem
  • Dendranthema × grandiflorum
  • high temperature
  • shoot branching

ASJC Scopus subject areas

  • Horticulture
  • Plant Science
  • Biotechnology

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