Synthesis and Function of Apocarotenoid Signals in Plants

Area of Science:

• Plant Biology
• Biochemistry
• Molecular Biology

Background:

• Carotenoids are vital for photosynthesis and photoprotection in plants.
• Apocarotenoids are derived from carotenoids via enzymatic or non-enzymatic cleavage.
• Apocarotenoids possess diverse functions, including roles as hormones, volatiles, and signaling molecules.

Purpose of the Study:

• To review emerging evidence for apocarotenoid signals (ACSs) in plant development.
• To highlight the regulatory roles of ACSs beyond abscisic acid (ABA) and strigolactone (SL).
• To explore the involvement of apocarotenoids in carotenoid feedback, chloroplast biogenesis, stress signaling, and organ development.

Main Methods:

• Literature review of studies on carotenoid metabolism and apocarotenoid functions.
• Analysis of evidence for apocarotenoid roles in various plant processes.
• Synthesis of findings related to apocarotenoid signaling pathways.

Main Results:

• Apocarotenoids are not mere breakdown products but can undergo post-cleavage modifications.
• Evidence suggests apocarotenoids function as signaling molecules (ACSs) regulating plant development.
• Apocarotenoids are implicated in carotenoid feedback, chloroplast biogenesis, stress responses, and organ development.

Conclusions:

• Apocarotenoids play significant regulatory roles in plant development.
• Apocarotenoid signals (ACSs) fine-tune plant responses to environmental stimuli.
• Further research into apocarotenoid functions is warranted to understand their full impact on plant biology.