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Réponses développementales et physiologiques de la Microvigne aux températures élevées : caractérisation de l’effet sur le bilan carboné et son implication dans l’avortement précoce des organes reproducteurs

Abstract : Global warming is likely to be a major issue for grapevine yield sustainability in the next years. A common hypothesis is that long-term elevated temperatures may cause the failure of key phases of reproductive development, through their negative impact on carbon balance. However, testing the specific role of plant carbon status on yield elaboration under elevated temperatures is difficult on perennial crops, such as grapevine, and when environment fluctuates. To overcome these difficulties, the present work was conducted under fully controlled environment using a natural, giberrelic acid insensitive mutant of grapevine called Microvine, as a new model for grapevine genetics and physiological studies. This mutant present a dwarf stature and lack of juvenile characteristics leading to the continuous flowering and fruiting even during the first year after sowing. The present study was aimed at (i) developing a framework of analysis for Microvine; (ii) describing vegetative and reproductive developments responses to temperature elevation at whole plant level, and more precisely on early reproductive development abortions; (iii) characterizing grapevine carbon balance responses to temperature; and finally (iv) evaluating carbon balance implication in temperature-dependent early reproductive development abortions. This work shows that complete inflorescence abortions observed in response to temperature were related to carbon status, either expressed though total carbohydrate, or through the level of reserves at the whole plant level. This study opens the way to use Microvine as model to address the impact of climate warming on grapevine vegetative and reproductive developments.
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  • HAL Id : tel-02799728, version 1
  • PRODINRA : 355581

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Nathalie Luchaire. Réponses développementales et physiologiques de la Microvigne aux températures élevées : caractérisation de l’effet sur le bilan carboné et son implication dans l’avortement précoce des organes reproducteurs. Sciences du Vivant [q-bio]. Institut National d'Etudes Supérieures Agronomiques de Montpellier, 2015. Français. ⟨tel-02799728⟩

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