Multimodal Dissection of UV-B-Induced Plant Defense Against Insect in Tea Plants

Area of Science:

• Plant Science
• Agricultural Science
• Biotechnology

Background:

• Sustainable agriculture needs pesticide-free pest control methods.
• Ultraviolet-B (UV-B) irradiation shows potential for enhancing plant resistance.
• Mechanisms of UV-B-induced plant defense are not fully understood.

Purpose of the Study:

• To investigate the mechanisms of UV-B-mediated plant defense in tea plants.
• To develop a multimodal framework for analyzing plant responses to UV-B.
• To identify key volatile compounds and metabolic changes involved in pest deterrence.

Main Methods:

• Utilized AI-enhanced electronic nose for volatile profiling.
• Employed in situ hyperspectral stimulated Raman scattering (SRS) microscopy for metabolic imaging.
• Integrated transcriptomic and molecular analyses for validation.
• Controlled UV-B treatments on tea plants (Camellia sinensis) challenged by Ectropis obliqua.

Main Results:

• Identified specific herbivore-induced volatiles (hexanal, (Z)-3-hexenol, octanal, (Z)-3-hexenyl acetate) optimally induced by UV-B.
• Observed elevated jasmonic acid derivatives and L-phenylalanine, reduced protein levels, and altered stomatal dynamics via SRS imaging.
• Confirmed transcriptional regulation of defense pathways.
• Linked UV-B treatment to enhanced insect deterrence.

Conclusions:

• Pioneered a multimodal strategy combining volatile detection, metabolic imaging, and molecular validation.
• Provided mechanistic insights into UV-B-induced plant defense responses.
• Highlighted the potential of multimodal approaches for developing sustainable, pesticide-free pest management in precision agriculture.