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Structure-activity relationship of lepidimoide and its analogues
1Graduate School of Science and Technology, Kobe University, Japan.
Phytochemistry
|February 1, 1996
Summary
Lepimoidide analogues were tested for plant growth promotion. The sugar alcohol form exhibited the highest activity, suggesting specific structural features are crucial for its growth-promoting effects.
Area of Science:
- Plant Physiology
- Organic Chemistry
- Biochemistry
Background:
- Lepimoidide is a plant growth regulator.
- Understanding its structure-activity relationship is key to developing new plant growth promoters.
Purpose of the Study:
- To investigate the structure-activity relationship of lepidimoide and its analogues.
- To identify the key structural features responsible for lepidimoide's plant growth-promoting activity.
Main Methods:
- Amaranthus caudatus L. hypocotyl elongation bioassay.
- Synthesis and testing of various lepidimoide analogues (e.g., carboxylic acid free, acetylated, methylated, hydroxylated, sugar alcohol).
- Testing of component sugars (alpha-D-galacturonic acid, L-(+)-rhamnose) and related compounds (D-glucose).
Main Results:
- The carboxylic acid free and acetylated lepidimoide analogues showed significant growth-promoting activity.
- Methylated and hydroxylated analogues (without a C-4,5 double bond) exhibited reduced or no activity.
- The sugar alcohol type of lepidimoide [2-O-(alpha-D-glucopyranosyl)-L-rhamnose] displayed the highest activity.
- Component sugars alone showed minimal to no activity.
Conclusions:
- The uronic acid derivative, alpha,beta-unsaturated carboxylate, alpha-glucoside linkage to rhamnose, and a C-4,5 double bond in the uronic acid are critical for lepidimoide's growth-promoting activity.
- Structural modifications significantly impact the biological activity of lepidimoide analogues.
- The sugar alcohol derivative represents a highly potent form for plant growth regulation.