Germanos2014

Référence

Germanos, G. (2014) Caractérisation d’un gène de résistance contre la tordeuse des bourgeons de l’épinette (Choristoneura fumiferana) chez l’épinette blanche (Picea glauca (Voss) Moench). Mémoire de maîtrise, Université Laval. (URL )

Résumé

A localized spruce budworm (Choristoneura fumiferana) outbreak that took place in a white spruce plantation (Picea glauca (Voss.) Moench) left some trees almost untouched while many others had severe defoliation. Expression of agene coding for a beta-glucosidase enzyme was identified (Pgβglu-1) and was linked to the accumulation of two acetophenones in the foliage of resistant trees. We propose that the expression variation of Pgβglu-1 involve regulation that is unique to resistant trees. Our results establish a correlation between gene expression, the accumulation of biologically active acetophenones and the most destructive larval instar of the insect. Our results also show that Pgβglu-1expression is genetically transmitted and can be induced. Coding DNA sequences of the gene were obtained but no differences were observed that could differentiate between resistant and non-resistant trees. A deeper understanding of the phenomenon could help in the development of an integrated management aiming to mitigate damage caused during outbreaks.

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@MASTERSTHESIS { Germanos2014,
    TITLE = { Caractérisation d’un gène de résistance contre la tordeuse des bourgeons de l’épinette (Choristoneura fumiferana) chez l’épinette blanche (Picea glauca (Voss) Moench) },
    AUTHOR = { Germanos, G. },
    SCHOOL = { Université Laval },
    YEAR = { 2014 },
    NOTE = { CEFTMS, MacKay, J. and Bauce, E. },
    ABSTRACT = { A localized spruce budworm (Choristoneura fumiferana) outbreak that took place in a white spruce plantation (Picea glauca (Voss.) Moench) left some trees almost untouched while many others had severe defoliation. Expression of agene coding for a beta-glucosidase enzyme was identified (Pgβglu-1) and was linked to the accumulation of two acetophenones in the foliage of resistant trees. We propose that the expression variation of Pgβglu-1 involve regulation that is unique to resistant trees. Our results establish a correlation between gene expression, the accumulation of biologically active acetophenones and the most destructive larval instar of the insect. Our results also show that Pgβglu-1expression is genetically transmitted and can be induced. Coding DNA sequences of the gene were obtained but no differences were observed that could differentiate between resistant and non-resistant trees. A deeper understanding of the phenomenon could help in the development of an integrated management aiming to mitigate damage caused during outbreaks. },
    URL = { https://corpus.ulaval.ca/jspui/handle/20.500.11794/25304 },
    TIMESTAMP = { 2019-10-10 },
}

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