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PhD day 2026 short talk.pdf
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Abstract
Trichomes are important structures in the plant epidermis that allow plants to interact with and be protected from their environment. Among them, glandular trichomes allow the producCon, storage and secreCon of various specialized metabolites involved in bioCc and abioCc interacCons. Despite their biological significance the geneCc mechanisms governing glandular trichome development, from their payerning to their secreCon and maturaCon, are sCll obscure. In this study, we focus on AGL, an AGAMOUS-Like MADS-box transcripCon factor involved in the formaCon of the glandular head of long glandular trichomes in NicoCana tabacum. Expression profiling revealed that AGL is specifically expressed just before and during the formaCon of the secretory head of glandular trichomes. Then, AGL over-expression significantly increased glandular and decreased non-glandular trichome formaCons. To further explore the role of AGL, and the mechanisms of glandular head formaCon in trichomes, we performed transcriptomic (RNA-seq) and genomic (DAP-seq) analysis. Those revealed that AGL is involved in pathways of secondary metabolism, but also Cssue differenCaCon, epidermal development and flower development. Among them, we hypothesize that AGL can induce the formaCon of glandular heads through genes such as TOE1, previously characterized in tomato. AGL could also induce trichome formaCon through its direct acCvaCon of GL2.
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Walckiers, G., Berhin, A., Peeters, M., & Hachez, C. (2026, September 7). AGAMOUS like, a genetic switch toward glandular fate in trichomes of Nicotiana tabacum. https://hdl.handle.net/2078.5/279925