A plant growth retardant related to chlamydocin and its proposed mechanism of action.
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.
Tani
Hiroko
H
Department of Agricultural Chemistry, Faculty of Agriculture, Tottori University, Tottori 680-8553, Japan.
Honma
Tamaki
T
Fujii
Yuzo
Y
Yoneyama
Koichi
K
Nakajima
Hiromitsu
H
D000040:Abscisic Acid / Q000032:analysis; D001681:Biological Assay; D005875:Gibberellins / Q000032:analysis; D013058:Mass Spectrometry / Q000379:methods; D012275:Oryza / Q000187:drug effects; D010456:Peptides, Cyclic / Q000737:chemistry* / Q000494:pharmacology*; D010937:Plant Growth Regulators / Q000737:chemistry* / Q000494:pharmacology*; D012639:Seeds / Q000187:drug effects / Q000254:growth & development; D013329:Structure-Activity Relationship
D005875:Gibberellins; D010456:Peptides, Cyclic; D010937:Plant Growth Regulators; C006963:chlamydocin; D000040:Abscisic Acid