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A Near Infrared Fluorescent Nanosensor for Spatial and Dynamic Measurements of Auxin, Indole-3-Acetic Acid, in Planta

Khong, D. T.; Vu, K. V.; Sng, B. J. R.; Choi, I. K. Y.; Porter, T. K.; Cui, J.; Gong, X.; Wang, S.; Nguyen, N. H.; Ang, M.; Park, M.; Lew, T. T. S.; Loh, S. I.; Ahsim, R.; Chin, H. J.; Singh, G. P.; Chan-Park, M. B.; Chua, N.-H.; Strano, M. S.; Jang, I.-C.

2024-05-24 bioengineering
10.1101/2024.05.23.595494 bioRxiv
Show abstract

Auxins, particularly indole-3-acetic acid (IAA), is a phytohormone critical for plant growth, development, and response to environmental stimuli. Despite its importance, there is a lack of species-independent sensors that allow direct and reversible detection of IAA. Herein, we introduce a novel near infrared fluorescent nanosensor for spatial and temporal measurement of IAA in planta using Corona Phase Molecular Recognition. The IAA nanosensor shows high specificity to IAA in vitro and was validated to localize and function in plant cells. The sensor works across different plant species without optimization and allows visualization of dynamic changes to IAA distribution and movement in leaf tissues. The results highlighted the utility of IAA nanosensor for understanding IAA dynamics in planta.

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