Response of different white fir geographic provenances to Trichosporium symbioticum inoculation in California

نویسندگان

  • William J. Otrosina
  • Stanley J. Zarnoch
چکیده

We inoculated the fir engraver (Scolytus ventralis LeConte) associated fungus Trichosporium symbioticum Wright onto 56 white fir (Abies concolor (Gordon & Glend.) Lindl. ex Hildebr.) trees planted in a common garden study near Camino, California, that represented five geographic provenances of this species. The objective was to determine if there is a differential lesion length response of white fir provenances with respect to provenance. We found a significant (P < 0.019) difference between the provenances from Arizona and those of eastern Nevada origins 28 days after inoculation. There was a significant interaction between the two T. symbioticum isolates and season of inoculation. Fall inoculations tended to have smaller lesions than those in the spring but this varied by isolate in that the one from eastern Nevada tended to produce longer lesions in the spring (P = 0.0001) whereas the isolate from the Camino plantation did not differ between spring and fall (P = 1.000). There is evidence for genetic variability relative to white fir provenance lesion length in response to T. symbioticum inoculation, and in future studies, isolate variability should also be taken into account. Résumé : Nous avons inoculé le champignon Trichosporium symbioticum Wright associé au scolyte sculpteur du sapin (Scolytus ventralis LeConte) sur 56 sapins concolores (Abies concolor (Gordon & Glend.) Lindl. ex Hildebr.) plantés dans le cadre d’une étude en jardin commun près de Camino, en Californie, qui compte cinq provenances géographiques de cette espèce. L’objectif consistait à déterminer si la longueur des lésions varie selon la provenance du sapin concolore. Nous avons observé une différence significative (P < 0,019) entre les provenances de l’Arizona et celles de l’est du Nevada 28 jours après l’inoculation. Il y avait une interaction significative entre les deux isolats de T. symbioticum et la saison d’inoculation. Les inoculations faites à l’automne avaient tendance à produire de plus petites lésions que celles du printemps mais cela variait selon l’isolat : l’isolat de l’est du Nevada avait tendance à produire des lésions plus longues au printemps (P = 0,0001) tandis que les lésions produites par l’isolat provenant de la plantation de Camino avaient les mêmes dimensions (P = 1,000) que l’inoculation ait eu lieu au printemps ou à l’automne. Il y a des indices que la longueur des lésions en réaction à l’inoculation de T. symbioticum reflète la variabilité génétique des provenances de sapin concolore et les études ultérieures devraient également tenir compte de la variabilité des isolats. [Traduit par la Rédaction]

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تاریخ انتشار 2012