Andmebaasi logo

Põllumajandus- ja keskkonnainstituut

Selle valdkonna püsiv URIhttp://hdl.handle.net/10492/2466

Sirvi

Sirvi Põllumajandus- ja keskkonnainstituut Autor "Aav, Alice" järgi

Nüüd näidatakse 1 - 1 1
  • Pisipilt
    Kirje
    Phenotypic characterisation of potato late blight pathogen Phytophthora infestans in Baltic countries
    (Eesti Maaülikool, 2016) Aav, Alice; Runno-Paurson, Eve (advisor); Mänd, Marika (advisor); Hannukkala, Asko O.; Karise, Reet
    Potato late-blight is one of the most destructive diseases of potato (Solanum tuberosum L.) worldwide; it is caused by the oomycete Phytophthora infestans (Mont.) de Bary. The disease is also a serious problem for potato growers in the Baltic countries, where the average losses are 15-30% and if the weather during the vegetation period is favourable for P. infestans, then the loss of yield can go up to 50%. P. infestans populations in Estonia have been studied since 1966, still due to the consequence of sexual reproduction, there is an ongoing change in genotypes and continuous diversification occurring in the Estonian P. infestans population, which should be studied continually. In Latvia and Lithuania, data on P. infestans population characteristics is insufficient and out of date, therefore, the novelty of this study was to fill the information gaps about the phenotypic characteristics in the populations of P. infestans in Latvia and Lithuania as one part of Eastern Europe. The main aims of the this study were to determine the general characteristics of the populations of P. infestans in the Baltic countries, in terms of mating type, reaction to metalaxyl and pathotypic diversity. The results revealed that the mating type ratio in Estonian, Latvian and Lithuanian populations of P. infestans, was close to 1:1 throughout the studied years, furthermore, mating types A1 and A2 were present in the same fields at the same time, indicating possible sexual reproduction in these pathogen populations. Also the results in Estonian, Latvian and Lithuanian populations of the pathogen, concerning the metalaxyl-resistance, during 2010-2013 were quite similar with domination by metalaxyl-sensitive isolates. All known virulence factors were found from all studied countries, the most common virulence factors were R1, R2, R3, R4, R6, R7, R10, R11. The rarest virulence factors in all Baltic countries were R5, R8 and R9. In general, the populations of P. infestans are similar in Estonia, Latvia and Lithuania. Minor differences can be considered normal as the populations are highly diverse and the pathogen is continuously changing.