Abstract only

Zymoseptoria tritici (synonym Septoria tritici) is considered the most important foliar disease of both durum (Triticum durum) and bread wheat (Triticum aestivum) collected from Tunisian and European fields. The objective of this work was to investigate the host species pattern of adaptation of the fungus, on populations isolated from bread and durum wheat fields using 11 highly polymorphic nuclear microsatellites and one mitochondrial DNA (mtRFLP4) nucleotide sequence. Populations? subdivision was based on both wheat species and the presence/absence of the specific mtRFLP4 sequence. Gene flow estimates showed high migration levels between all populations suggesting low differentiation with an exception of less than one migrant per generation (Nm<1) observed between populations from bread wheat not carrying the specific mtRFLP4 sequence and all the others populations. Genetic differentiation was subsequently assessed using pairwise FST and Jost?s D estimates. The analyses indicate significant difference between bread wheat adapted population not carrying mtRFLP4 sequence and all others Z. tritici populations. Results suggest that wheat species specificity in Z. tritici might be altered by the specific mitochondrial mtRFLP4 locus.

Global Wheat Program

English

Lucia Segura

INT3301

CIMMYT Staff Publications Collection