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Theses

Réponses de jeunes chênes de deux espèces (Quercus robur L., Q. petraea [Matt] Liebl.) à l'hypoxie racinaire : Marqueurs physiologiques, moléculaires et génétiques de sensibilité et application à la comparaison des deux espèces

Abstract : Pedonculate oak (Q. robur) and sessile oak (Q. petraea) differ by their ecological requirements. In particular Q. robur displays a larger tolerance to water-logging than Q. petraea. Inter-specific differences were found in the response to water-logging at root metabolism level, with differences in pyruvate decarboxylase (transcripts and activity), key enzyme in the alcoholic fermentation pathway. Moreover, the long term maintenance of the enzymes of sucrose catabolism, should underline a lower carbon unloading in hypoxic roots of Q. petraea than in Q. robur. The larger capacity of Q. robur to produce adventitious roots and hypertrophied lenticels was confirmed. These organs were shown to be related to the degree of water-logging tolerance of the species, despite they do not seem to be involved in root aeration. In addition, the degree of leaf epinasty was demonstrated to be an early symptom of plant sensitivity to the stress. QTL were identified for hypertrophied lenticels formation and for the degree of epinasty in Q. robur. The use of a multi-environment model allowed to record the temporal evolution of the allelic substitution effect of some of the QTL detected, and evidenced that the response to water-logging probably involves a large number of genes induced simultaneously over the whole genome. The intra-specific variability of response to water-logging suggests that the higher tolerance of Q. robur would be due to an higher variability resulting in an higher frequency of tolerant seedlings, compared to Q. petraea, in spite of a common genetic background for the two species, and not to different specific traits.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2006_0049_PARELLE.pdf
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https://hal.univ-lorraine.fr/tel-01746617
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Submitted on : Thursday, March 29, 2018 - 10:41:22 AM
Last modification on : Thursday, November 5, 2020 - 9:02:01 AM

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  • HAL Id : tel-01746617, version 1
  • PRODINRA : 15874

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Julien Parelle. Réponses de jeunes chênes de deux espèces (Quercus robur L., Q. petraea [Matt] Liebl.) à l'hypoxie racinaire : Marqueurs physiologiques, moléculaires et génétiques de sensibilité et application à la comparaison des deux espèces. Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10049⟩. ⟨tel-01746617⟩

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