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首页> 外文期刊>Genetic Resources and Crop Evolution >Secondary metabolites content may clarify the traditional selection process of the greater yam cultivars (Dioscorea alata L.)
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Secondary metabolites content may clarify the traditional selection process of the greater yam cultivars (Dioscorea alata L.)

机译：次级代谢物含量可以阐明更大山药品种的传统选择过程（Dioscorea Alata L.）

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摘要

Dioscorea alata L. is one of the most widely grown and economically important yam species. Hundreds of accessions are maintained ex situ in germplasm collections and have been characterized with descriptors but new tools are still needed to assess tuber chemical composition. The objectives of the present study were to analyze saponins and catechins profiles in 388 D. alata cultivars (landraces) from distant geographical sources (Nigeria, Vietnam, Papua New Guinea and Vanuatu) and to compare them with those of 162 selected hybrids. The relationships between these compounds and tuber flesh oxidation and browning were also studied in order to understand their possible role in the ancient cultivars selection process. Dioscin and gracillin, the most documented Dioscorea saponins, were absent among the 550 D. alata cultivars and hybrids analyzed using HP-TLC. Two saponins and four catechins were quantitated, including epicatechin. Mean total catechins and saponins values were very low for most cultivars and higher mean values were found in hybrids. Correlation coefficients revealed possible relationships between total saponins and catechins contents with speed of oxidation, presence of mucilage and flour colour. Distribution of cultivars values within each country indicate that these were mostly selected for their low saponins and catechins contents through simple visual assessment. Metabolite profiles can be used to improve the phenotyping efficiency of D. alata hybrids generated through conventional breeding.
机译：Dioscorea Alata L.是最广泛种植和经济上重要的山药种类之一。在种质收集中保持数百种进程，并以描述符为特征，但仍需要新的工具来评估块茎化学成分。本研究的目的是分析来自遥远地理来源（尼日利亚，越南，巴布亚新几内亚和瓦努阿图）的388 D. alata品种（Landraces）的皂苷和儿科素材曲线，并将它们与162名选定的混合动力车的比较。还研究了这些化合物和块茎氧化氧化和褐变之间的关系，以了解古代品种选择过程中可能的作用。 Dioscin和Gracillin，最具记录的Dioscorea Saponins，在使用HP-TLC分析的550天品种和杂种中不存在。定量了两种皂苷和四种儿茶素，包括EPICATECHIN。对于大多数品种而言，平均总儿茶素和皂苷值非常低，并且在杂交种中发现了更高的平均值。相关系数揭示了总皂苷和儿茶素含量与氧化速度的可能关系，粘合剂和面粉的存在。每个国家内部品种价值的分布表明，通过简单的视觉评估，这些品种主要选择为其低皂苷和儿茶素内容。代谢物型材可用于改善通过常规育种产生的D. alata杂种的表型效率。

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