Structure-Function Analysis of Volatile (Z)-3-Fatty Alcohols in Tomato

Area of Science:

• Plant Biology
• Chemical Ecology
• Molecular Signaling

Background:

• Plants emit green leaf volatiles (GLVs) as stress signals.
• Receiver plants use GLVs to activate defense mechanisms.
• Perception mechanisms and structural determinants of GLV activity are not fully understood.

Purpose of the Study:

• To investigate the role of carbon chain length and double bonds in the bioactivity of (Z)-3-fatty alcohols.
• To identify structural features of GLVs that influence plant signaling and physiological responses.

Main Methods:

• Testing (Z)-3-fatty alcohols with varying carbon chain lengths (4-9 carbons) and double bond positions.
• Assessing medium alkalinization and MAP kinase phosphorylation in Solanum peruvianum cell cultures.
• Evaluating root growth inhibition in Solanum lycopersicum seedlings.

Main Results:

• Longer chain (Z)-3-fatty alcohols ((Z)-3-octenol, (Z)-3-nonenol) showed higher bioactivity in signaling and physiological assays.
• Bioactivity correlated with carbon chain length and lipophilicity.
• Double bond presence and position, as well as chain length, influence GLV perception and activity.

Conclusions:

• Plant perception mechanisms for (Z)-3-fatty alcohols favor longer chains or greater accessibility.
• Structural features of GLVs are critical determinants of their bioactivity in plant defense.
• This research provides insights into the molecular basis of plant communication via GLVs.