Data/hora: 03/06/2024 12:39:03

Biblioteca(s): | Epagri-Sede.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | Internacional - A
Data corrente: | 08/10/2021
Data da última atualização: | 08/10/2021
Autoria: | RESENDE, R. S.; VLEESSCHAUWER, D.; HÖFTE, M.; RODRIGUES, F. Á.
Título: | New insights into the hormonal regulation of silicon-supplied sorghum plants challenged with Colletotrichum sublineolum.
Ano de publicação: | 2021
Fonte/Imprenta: | Physiological and Molecular Plant Pathology, Netherlands, v. 115, 2021.
Idioma: | Inglês

Conteúdo:

Importance 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.

Palavras-Chave: | Acervulus; Fungal foliar disease; Hemibiotrophic pathogen; Host defense responses; Plant nutrition.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_50025.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (106250-1) - UPC - AP - DD -  -  -  - DIS