A plant growth retardant related to chlamydocin and its proposed mechanism of action.

Abstract

A comparison of the plant growth retardant activity of the chlamydocin analogues, compound 1, six derivatives from 1 and 2, and two synthetic analogues revealed that there are two types of retardant in chlamydocin analogues. One, for example in compound 1, requires an oxygen atom at C-8 of the 2-aminodecanoic acid moiety to show retardant activity. The other, for example in compound 8, requires no oxygen atom at C-8 but requires a specific alkyl group chain length for activity. To determine the differences in mode of action of both types of retardant, rice seedlings were separately treated with compounds 1 and 8, and after appearance of dwarfism, their endogenous ABA and GA(1) levels were determined and compared to those of the control. Treatment with 1 (10 nmol/plant) increased ABA levels 4 times higher than that of the control and decreased GA(1) levels to 20% of that of the control. Treatment with 8 (30 nmol/plant) did not affect the ABA level but decreased GA(1) content to 5% of that of the control.

• Authors: Hiroko Tani, Tamaki Honma, Yuzo Fujii, Koichi Yoneyama, Hiromitsu Nakajima
• Journal: Phytochemistry (Phytochemistry) Vol. 62 Issue 7 Pg. 1133-40 (Apr 2003) ISSN: 0031-9422 [Print] England
• PMID: 12591268 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Gibberellins
• Peptides, Cyclic
• Plant Growth Regulators
• chlamydocin
• Abscisic Acid

Topics

• Abscisic Acid (analysis)
• Biological Assay
• Gibberellins (analysis)
• Mass Spectrometry (methods)
• Oryza (drug effects)
• Peptides, Cyclic (chemistry, pharmacology)
• Plant Growth Regulators (chemistry, pharmacology)
• Seeds (drug effects, growth & development)
• Structure-Activity Relationship