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Dynamics of ascorbic acid content in apple (Malus x domestica) during fruit development and storage.
Plant Physiology and Biochemistry ( IF 6.1 ) Pub Date : 2020-03-05 , DOI: 10.1016/j.plaphy.2020.03.006
Eline Lemmens 1 , Enriqueta Alós 1 , Marijn Rymenants 2 , Nico De Storme 1 , Wannes Johan Keulemans 1
Affiliation  

Vitamin C is a crucial antioxidant and cofactor for both plants and humans. Apple fruits generally contain low levels of vitamin C, making vitamin C content an interesting trait for apple crop improvement. With the aim of breeding high vitamin C apple cultivars it is important to get an insight in the natural biodiversity of vitamin C content in apple fruits. In this study, quantification of ascorbic acid (AsA), dehydroascorbic acid (DHA), and total AsA (AsA + DHA) in apple pulp of 79 apple accessions at harvest revealed significant variation, indicating a large genetic biodiversity. High density genotyping using an 8 K SNP array identified 21 elite and 58 local cultivars in this germplasm, with local accessions showing similar levels of total AsA but higher amounts of DHA compared to elite varieties. Out of the 79 apple cultivars screened, ten genotypes with either the highest or the lowest concentration of total AsA at harvest were used for monitoring vitamin C dynamics during fruit development and storage. For all these cultivars, the AsA/DHA ratio in both apple pulp and peel increased throughout fruit development, whereas the AsA/DHA balance always shifted towards the oxidized form during storage and shelf life, putatively reflecting an abiotic stress response. Importantly, at any point during apple fruit development and storage, the apple peel contained a higher level of vitamin C compared to the pulp, most likely because of its direct exposure to abiotic and biotic stresses.

中文翻译:

苹果果实发育和贮藏过程中抗坏血酸含量的动态。

维生素C是植物和人类的重要抗氧化剂和辅助因子。苹果果实通常含有低水平的维生素C,使维生素C含量成为改善苹果农作物的有趣特征。为了培育高维生素C苹果品种,重要的是要洞察苹果果实中维生素C含量的自然生物多样性。在这项研究中,对收获时79份苹果品种的苹果果肉中抗坏血酸(AsA),脱氢抗坏血酸(DHA)和总AsA(AsA + DHA)的定量显示了显着差异,表明遗传多样性很大。使用8 K SNP阵列进行的高密度基因分型,鉴定出该种质中21个优良品种和58个本地品种,与优良品种相比,本地种质显示出相似的总AsA水平,但DHA含量更高。在筛选的79个苹果品种中,采收时使用十种具有最高或最低总AsA浓度的基因型来监测水果发育和贮藏期间的维生素C动态。对于所有这些品种,苹果果肉和果皮中的AsA / DHA比值在整个果实发育过程中均增加,而AsA / DHA平衡在贮藏和保质期内始终向氧化态转移,推测反映了非生物胁迫响应。重要的是,在苹果果实发育和储存期间的任何时候,苹果果皮都比果肉中含有更高水平的维生素C,这很可能是因为它直接暴露于非生物和生物胁迫下。苹果果肉和果皮中的AsA / DHA比值在整个果实发育过程中都增加,而在储存和保质期内,AsA / DHA平衡始终朝着氧化形式转移,这可能反映了非生物胁迫响应。重要的是,在苹果果实发育和储存期间的任何时候,苹果果皮都比果肉中含有更高水平的维生素C,这很可能是因为它直接暴露于非生物和生物胁迫下。苹果果肉和果皮中的AsA / DHA比值在整个果实发育过程中都增加,而在储存和保质期内,AsA / DHA平衡始终朝着氧化形式转移,这可能反映了非生物胁迫响应。重要的是,在苹果果实发育和储存期间的任何时候,苹果果皮都比果肉中含有更高水平的维生素C,这很可能是因为它直接暴露于非生物和生物胁迫下。
更新日期:2020-03-05
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