02430naa a2200217 a 450000100080000000500110000800800410001910000190006024501480007926000090022752017260023665300140196265300260197665300280200265300270203065300200205770000220207770000150209970000220211477300760213611312982021-10-08       2021    bl uuuu     u00u1 u    #d1 aRESENDE, R. S.  aNew insights into the hormonal regulation of silicon-supplied sorghum plants challenged with Colletotrichum sublineolum.h[electronic resource]  c2021  aImportance of sorghum as staple food worldwide is unquestionable and silicon (Si) supply has decreased the foliar symptoms of anthracnose, caused by Colletotrichum sublineolum, through potentiation of defense responses and preservation of photosynthetic apparatus. This study investigated the role of Si in cytological changes as well as in the expression of genes involved in auxin metabolism (GH3.1) and in signaling pathways mediated by salicylic acid (SA) (BTHip), jasmonic acid (JA)/ethylene (ET) (LOX), and JA (Jar, AOS 1, and ACCox) by real-time polymerase chain reaction in the leaves of plants non-supplied (-Si) or supplied (+Si) with Si and non-inoculated or inoculated with C. sublineolum. Sheath cells from +Si plants were less colonized by fungal hyphae due to intense phenolics and lignin deposition and high hydrogen peroxide production. Foliar lesions for +Si plants sprayed with an ET signaling inhibitor, ET biosynthesis inhibitor, and JA biosynthesis inhibitor were bigger compared to +Si plants sprayed with water. For +Si plants sprayed with ET and JA signaling inhibitors, foliar lesions were smaller compared to -Si plants sprayed with these same compounds. Suppression of auxin biosynthesis, transporter, and signaling by specifc inhibitors resulted in smaller lesions. Expressions of GH3.1, BRHip, LOX, Jar, AOS 1, and ACCox were greater for +Si plants compared to -Si plants during the infection process of C. sublineolum. This study highlighted the potential of Si to boost sorghum resistance to anthracnose through a multistep process involving hormone-signaling pathways, especially regarding auxin metabolism and homeostasis, hydrogen peroxide generation, and plant cell wall strengthening.  aAcervulus  aFungal foliar disease  aHemibiotrophic pathogen  aHost defense responses  aPlant nutrition1 aVLEESSCHAUWER, D.1 aHÖFTE, M.1 aRODRIGUES, F. Á.  tPhysiological and Molecular Plant Pathology, Netherlandsgv. 115, 2021.