Fruit quality traits play an important role in consumption of kiwiberry (). The genetic basis of fruit quality traits in this woody, perennial and dioecious fruit crop remains largely unknown. This study aimed to identify the underlying genetic basis of fruit quality traits in , using a single nucleotide polymorphism (SNP) genetic linkage map previously developed in a tetraploid F population of ‘Ruby-3’ × ‘KuiLv-M’. The F population was phenotyped over three years (2020–2022) for fruit quality traits, including skin color, flesh color, fruit weight, fruit diameter, total soluble solids, fruit longitudinal diameter and fruit shape index. A total of nine QTLs were detected for five traits, explaining 10%–32% of the trait variation. For fruit color, the support interval of a major QTL on LG9 contained an MYB transcription factor MYB110, which was previously demonstrated to control color regulation in kiwifruit, thus suggesting that the is the candidate gene for fruit color in kiwiberry. The linked marker for fruit color was validated in an F population and 25 kiwiberry cultivars. In conclusion, the knowledge obtained through the QTL mapping is applicable to improve the efficiency and cost-effectiveness in kiwiberry breeding.

中文翻译：

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四倍体猕猴桃果实品质性状的QTL定位


果实品质性状在猕猴桃的消费中起着重要作用()。这种多年生、雌雄异株的木本水果作物的果实品质性状的遗传基础在很大程度上仍然未知。本研究旨在利用先前在“Ruby-3”דKuiLv-M”四倍体F群体中开发的单核苷酸多态性（SNP）遗传连锁图谱来确定果实品质性状的潜在遗传基础。对 F 群体进行了三年（2020-2022）果实品质性状的表型分析，包括皮色、果肉颜色、果实重量、果实直径、可溶性总固形物、果实纵径和果实形状指数。 5个性状共检测到9个QTL，解释了10%~32%的性状变异。对于果实颜色，LG9上的一个主要QTL的支持区间包含一个MYB转录因子MYB110，该因子先前被证明可以控制猕猴桃的颜色调节，因此表明该基因是猕猴桃果实颜色的候选基因。果实颜色的连锁标记在 F 群体和 25 个猕猴桃品种中得到了验证。总之，通过QTL作图获得的知识可用于提高猕猴桃育种的效率和成本效益。