Small Molecules with Thiourea Skeleton Induce Ethylene Response in Arabidopsis

Area of Science:

• Plant Biology
• Agricultural Science
• Organic Chemistry

Background:

• Ethylene is a crucial gaseous plant hormone regulating growth, ripening, and senescence.
• Ethylene stimulates parasitic weed germination, presenting a target for crop protection strategies.
• Current ethylene-based control agents (ethylene, ethephon) have limitations due to ethylene's gaseous nature.

Purpose of the Study:

• To develop a practical, solid-state ethylene response inducer for weed and crop control.
• To identify and synthesize novel thiourea-based compounds with ethylene-like activity.

Main Methods:

• Chemical screening using Arabidopsis thaliana's "triple response" assay.
• Synthesis and evaluation of thiourea derivatives for ethylene-like activity.
• Mode of action analysis using chemical inhibitors and ethylene signaling mutants.

Main Results:

• A novel thiourea compound, ZKT1, was identified as an ethylene response inducer.
• Several ZKT1 derivatives exhibited significantly enhanced ethylene-like activity, comparable to 1-aminocyclopropane-1-carboxylate.
• ZKT1 derivatives activate the ethylene signaling pathway via upstream component interactions.

Conclusions:

• Thiourea derivatives, exemplified by ZKT1, represent a promising class of solid-state ethylene response inducers.
• These compounds offer a viable alternative to gaseous ethylene for agricultural applications, particularly in weed management.
• The developed compounds have potential as potent crop-controlling agents.