In a grapevine segregating population, genomic regions governing berry pH were identified, paving the way for breeding new grapevine varieties best adapted to a warming climate. As a consequence of global warming, grapevine berry acidity is expected to dramatically decrease. Adapting grapevine (Vitis vinifera L.) varieties to the climatic conditions of the future requires a better understanding of the genetic architecture of acidity-related traits. For this purpose, we studied during five growing seasons 120 individuals from a grapevine biparental cross. Each offspring was genotyped by simple sequence repeats markers and by hybridization on a 20-K Grapevine Illumina® SNP chip. Quantitative trait loci (QTLs) for pH colocalized with QTLs for the ratio between potassium and tartaric acid concentrations, on chromosomes 10, 11 and 13. Strong QTLs for malic acid concentration or for the malic acid-to-tartaric acid ratio, on chromosomes 6 and 8, were not associated with variations of pH but can be useful for controlling pH stability under high temperatures. Our study highlights the interdependency between acidity parameters and consequently the constraints and degrees of freedom for designing grapevine genotypes better adapted to the expected warmer climatic conditions. In particular, it is possible to create grapevine genotypes with a high berry acidity as the result of both high tartaric acid concentrations and low K+ accumulation capacities.

中文翻译：

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葡萄浆果酸度的遗传变异受有机酸和钾之间的相互作用控制。

在葡萄分离种群中，确定了控制浆果 pH 值的基因组区域，为培育最适合气候变暖的新葡萄品种铺平了道路。由于全球变暖，葡萄浆果的酸度预计会急剧下降。使葡萄（Vitis vinifera L.）品种适应未来的气候条件需要更好地了解酸度相关性状的遗传结构。为此，我们在五个生长季节研究了来自葡萄双亲杂交的 120 个人。通过简单的序列重复标记和在 20-K Grapevine Illumina® SNP 芯片上杂交对每个后代进行基因分型。在 10、11 和 13 号染色体上，pH 的数量性状基因座 (QTL) 与钾和酒石酸浓度比的 QTL 共定位。6 号和 8 号染色体上苹果酸浓度或苹果酸与酒石酸比率的强 QTL 与 pH 值的变化无关，但可用于控制高温下的 pH 稳定性。我们的研究强调了酸度参数之间的相互依赖性，以及因此设计葡萄基因型更好地适应预期的温暖气候条件的约束和自由度。特别是，由于高酒石酸浓度和低 K+ 积累能力，有可能产生具有高浆果酸度的葡萄基因型。我们的研究强调了酸度参数之间的相互依赖性，以及因此设计葡萄基因型更好地适应预期的温暖气候条件的约束和自由度。特别是，由于高酒石酸浓度和低 K+ 积累能力，有可能产生具有高浆果酸度的葡萄基因型。我们的研究强调了酸度参数之间的相互依赖性，以及因此设计葡萄基因型更好地适应预期的温暖气候条件的约束和自由度。特别是，由于高酒石酸浓度和低 K+ 积累能力，有可能产生具有高浆果酸度的葡萄基因型。