Lepidimoic acid increases fructose 2,6-bisphosphate in Amaranthus seedlings

Area of Science:

• Plant Physiology
• Biochemistry
• Metabolomics

Background:

• Cytosolic signal metabolites play crucial roles in regulating plant metabolic pathways.
• Fructose 2,6-bisphosphate (Fru-2,6-P2) is a key activator of pyrophosphate-dependent phosphofructokinase (PFP).
• Understanding plant growth promoters' effects on primary metabolism is vital for agricultural science.

Purpose of the Study:

• To investigate the effect of the growth promoter lepidimoic acid on Fru-2,6-P2 levels in Amaranthus caudatus seedlings.
• To determine how lepidimoic acid influences glycolytic metabolism and key intermediates.
• To elucidate the mechanism by which lepidimoic acid affects plant energy metabolism.

Main Methods:

• Treatment of Amaranthus caudatus seedlings with varying concentrations of lepidimoic acid (0.3, 3, and 30 mM).
• Quantification of cytosolic Fru-2,6-P2 concentrations using biochemical assays.
• Analysis of key glycolytic intermediates, including fructose 1,6-bisphosphate, fructose 6-phosphate, and glucose 6-phosphate.

Main Results:

• Lepimoic acid treatment significantly increased Fru-2,6-P2 concentrations in a dose-dependent manner (2- to 4-fold increases).
• Elevated lepidimoic acid levels led to an increase in fructose 1,6-bisphosphate.
• Decreases in fructose 6-phosphate and glucose 6-phosphate were observed in response to lepidimoic acid.

Conclusions:

• Lepimoic acid acts as a potent stimulator of Fru-2,6-P2 accumulation in Amaranthus seedlings.
• The observed changes in glycolytic intermediates suggest lepidimoic acid enhances glycolytic flux.
• Lepimoic acid likely modulates plant glycolysis by increasing PFP activity via elevated Fru-2,6-P2 levels.