Cultivar‐dependent partial resistance and associated defence mechanisms in wheat against Zymoseptoria tritici |
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| Authors: | M E Ors B Randoux S Selim A Siah G Couleaud C Maumené K Sahmer P Halama P Reignault |
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| Institution: | 1. Unité de Chimie Environnementale et Interactions sur le Vivant, Univ. Littoral C?te d'Opale, UCEIV‐EA 4492, SFR Condorcet FR CNRS 3417, Calais Cedex, France;2. Arvalis‐Institut du Végétal, Boigneville, France;3. UniLaSalle, Department of Agronomy and Animal Science, SFR Condorcet FR CNRS 3417, Beauvais Cedex, France;4. Laboratoire Charles Violette, SFR Condorcet FR CNRS 3417, Institut Supérieur d'Agriculture, Lille Cedex, France;5. Laboratoire Génie Civil et géoEnvironnement (LGCgE) Lille‐Nord de France, Institut Supérieur d'Agriculture, Lille Cedex, France |
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| Abstract: | Septoria tritici blotch caused by the fungus Zymoseptoria tritici is one of the most devastating foliar diseases of wheat. Knowledge regarding mechanisms involved in resistance against this disease is required to breed durable resistances. This study compared the expression of defence and pathogenicity determinants in three cultivars in semicontrolled culture conditions. The most susceptible cultivar, Alixan, presented higher necrosis and pycnidia density levels than Altigo, the most resistant one. In Premio, a moderately resistant cultivar, necrosis developed as in Alixan, while pycnidia developed as in Altigo. In noninfectious conditions, genes coding for PR1 (pr1), glucanase (gluc) and allene oxide synthase (aos) were constitutively expressed at a higher level in both Altigo and Premio than in Alixan, while chitinase2 (chit2), phenylalanine ammonia‐lyase (pal), peroxidase (pox2) and oxalate oxidase (oxo) were expressed at a higher level in Premio only. Except for aos, all genes were induced in Alixan during the first steps of the symptomless infection phase. Only pox2, oxo, gluc and pal genes in Altigo and pal, chs and lox genes in Premio were up‐regulated at some time points. Basal cultivar‐dependent resistance against Z. tritici could therefore be explained by various gene expression patterns rather than high expression levels of given genes. During the necrotrophic phase, Z. tritici cell wall‐degrading enzyme activity levels were lower in Altigo and Premio than in Alixan, and were associated more with pycnidia than with necrosis. Similar tissue colonization occurred in the three cultivars, suggesting an inhibition of the switch to the necrotrophic lifestyle in Altigo. |
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| Keywords: | cell wall‐degrading enzymes defence mechanisms RT‐qPCR
Triticum aestivum
Zymoseptoria tritici
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