Signaling defense responses of upland rice to avirulent and virulent strains of Magnaporthe oryzae.

Autor: Sperandio EM; Polo de Inovação, Instituto Federal Goiano, Rodovia Sul Goiana Km 01, Rio Verde, GO, 75901-000, Brazil. Electronic address: eugeniosperandio@gmail.com., Alves TM; Polo de Inovação, Instituto Federal Goiano, Rodovia Sul Goiana Km 01, Rio Verde, GO, 75901-000, Brazil. Electronic address: tavvs.alves@ifgoiano.edu.br., Vale HMMD; Departamento de Fitopatologia, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, Distrito Federal, 70910-900, Brazil. Electronic address: helson@unb.br., Gonçalves LA; Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Av. Esperança s/n, Campus Samambaia, Goiânia, GO, 74690-900, Brazil. Electronic address: leticiaicbufg@ufg.br., Silva ECE; Programa de Pós-graduação em Botânica, Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Av. Peter Henry Rolfs, s/n - Campus Universitário, Viçosa, MG, 36570-900, Brazil. Electronic address: elienaibio@gmail.com., Filippi MCC; Embrapa Arroz e Feijão, Zona Rural GO-462, Km 12, Santo Antônio de Goiás, GO, 75375-000, Brazil. Electronic address: cristina.filippi@embrapa.br.
Jazyk: angličtina
Zdroj: Journal of plant physiology [J Plant Physiol] 2020 Oct; Vol. 253, pp. 153271. Date of Electronic Publication: 2020 Aug 30.
DOI: 10.1016/j.jplph.2020.153271
Abstrakt: Rice blast (Magnaporthe oryzae) can cause large losses in crop yields, especially in upland rice systems. Avirulent strains of M. oryzae can induce resistance to subsequent attacks by virulent strains in plants. This study aimed to investigate the defense responses in upland rice challenged with a virulent strain of M. oryzae after acclimation with an avirulent strain. The avirulent strain decreased rice blast severity in the challenged plants. Induced resistance was characterized by a hypersensitive response and early accumulation of phenolic compounds. Scanning electron microscopy showed that M. oryzae conidia germinate and form appressoria, but do not colonize leaf tissues. The activities of pathogenesis-related proteins, total phenolic compounds, and salicylic acid (SA) were affected by acclimation to the avirulent strain. The activities of β-1,3-glucanase, phenylalanine ammonia-lyase, and peroxidase, as well as the SA levels explained most of the variability in the rice plant responses to M. oryzae. In addition, OsXa13, OsMAPKKK74, OsAOS2, OsACO7, and OsMAS1 expression was modulated depending on the virulence of the M. oryzae strains. This modulation in gene expression is critical for infection and some of these mechanisms are targeted by effectors, resulting in enhanced susceptibility and pathogen infection. These results have practical importance in plant-pathogen interaction studies to identify resistance-relevant mechanisms against M. oryzae in upland rice.
(Copyright © 2020 Elsevier GmbH. All rights reserved.)
Databáze: MEDLINE
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