Abscisic acid: An emerging player in plant-virus interactions

Area of Science:

• Plant pathology
• Molecular plant-microbe interactions
• Hormonal regulation of plant immunity

Background:

• Plants and viruses engage in a continuous evolutionary arms race.
• Plant hormones, particularly abscisic acid (ABA), are increasingly recognized for their roles in antiviral defense.
• The complex interplay between ABA and plant antiviral mechanisms requires comprehensive review.

Purpose of the Study:

• To review the multifaceted roles of abscisic acid (ABA) in plant antiviral immunity.
• To elucidate how ABA synchronizes defense pathways while also serving as a viral susceptibility factor.
• To highlight viral strategies for manipulating ABA signaling.

Main Methods:

• Literature review of existing research on ABA and plant antiviral immunity.
• Analysis of studies detailing ABA's impact on RNA silencing, callose deposition, and defense gene priming.
• Examination of evidence for ABA's counteraction of other defense hormones and proteins.
• Review of viral effector mechanisms targeting ABA signaling pathways.

Main Results:

• Abscisic acid (ABA) fortifies plant defenses by activating RNA silencing, strengthening plasmodesmata, and priming resistance genes.
• ABA can also enhance viral susceptibility by inhibiting antiviral proteins and interfering with other defense hormones.
• Viruses have evolved diverse strategies to manipulate ABA signaling pathways for their own benefit.
• ABA acts as a critical regulatory node influencing the trajectory of viral infections.

Conclusions:

• Abscisic acid (ABA) presents a complex, dual role in plant antiviral defense, acting as both a potent immune modulator and a target for viral exploitation.
• The manipulation of ABA signaling by viruses underscores its significance in determining infection outcomes.
• Further research into ABA's intricate effects on plant immunity is essential before practical applications for viral resistance can be considered.