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Architecture génétique de réponses au déficit hydrique chez la Vigne

Abstract : Responses to water deficit are complex traits. The analysis of their genetic architecture is based on quantitative genetics to identify a correlation between the trait variability and the molecular marker polymorphism. Several genetic regions were identified as involved in the genetic architecture of transpiration rate, water use efficiency, hydraulic conductivity and water extraction capacity. At the scion level, the genetic variability of hydraulic conductivity and stomatal regulation could partially influence the control of (an)isohydric behavior. At the rootstock level, one genomic region was specifically implicated in the water extraction capacity variability. The differences in the QTLs detected for transpiration rate per se and transpiration rate acclimation to water deficit suggest that genetic control is independent for these two aspects. We were also able to show that higher water use efficiency was not genetically linked to less biomass accumulation, allowing thus genetic improvement of water use. These results highlight promising breeding perspectives in grapevine.
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  • HAL Id : hal-01268777, version 1
  • PRODINRA : 274400

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Elisa Marguerit, Aude Coupel-Ledru, Francois Barrieu, Pierre-François Bert, Agnes Doligez, et al.. Architecture génétique de réponses au déficit hydrique chez la Vigne. Innovations Agronomiques, INRAE, 2014, 38, pp.49-65. ⟨hal-01268777⟩

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