Measurement of Electropotential Waves in Intact Sieve Elements Using Aphids as Bioelectrodes

Area of Science:

• Plant physiology
• Plant electrophysiology
• Biophysics

Background:

• Electropotential waves (EPWs) are crucial for rapid physiological signaling between plant organs.
• Measuring EPWs typically involves extracellular or intracellular probes, each with limitations.
• The phloem, particularly sieve elements, is the primary conduit for long-distance EPW transport.

Purpose of the Study:

• To detail a method for measuring EPWs using aphids as bioelectrodes.
• To highlight the advantages of aphid-based measurements for studying plant signaling.

Main Methods:

• Utilizing the Electrical Penetration Graph (EPG) technique with aphids.
• Employing aphids' mouthparts (stylets) for precise penetration into sieve elements.
• Performing noninvasive, intracellular recordings of EPWs via aphid bioelectrodes.

Main Results:

• Aphids enable direct, intracellular measurement of EPWs within sieve elements.
• This technique facilitates multiple electrode recordings and long-distance EPW observations.
• The aphid bioelectrode method offers a noninvasive approach to plant electrophysiology.

Conclusions:

• Aphids are valuable bioelectrodes for studying plant EPWs.
• The EPG technique provides a powerful tool for noninvasive, intracellular plant electrophysiological research.
• This method enhances the understanding of long-distance signaling in plants.