Setoguchi Yuno, Nakagawa Soya, Ohmura Ryo, Toshima Saki, Park Hyungjun, Narasako Yosuke, Hirano Tomonari, Otani Motoyasu, Kunitake Hisato
Graduate School of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan.
Division of Symbiotic System, National Institute for Basic Biology, Okazaki 444-8585, Japan.
Plants (Basel). 2023 May 8;12(9):1907. doi: 10.3390/plants12091907.
The storage roots of purple-fleshed sweet potato contain a variety of anthocyanins and polyphenols. Little is known about changes in the total content and composition of anthocyanins and polyphenols in the early growth stages of the root system. In this study, we investigated the changes in anthocyanins and polyphenols in the root system of purple-fleshed sweet potato cultivars at 15, 30, 45, and 60 days after transplant (DAT). Unexpectedly, the highest percentage of acylated anthocyanins in three purple-fleshed cultivars among all growth stages was at 15 DAT. On the other hand, the total polyphenol content in the early growth stages of the root system increased rapidly toward 45 DAT, just before the beginning of storage root enlargement, and then decreased rapidly as the storage roots began to enlarge. These data indicate that the early growth stage of the root system is a critical time. This timing may present a strategy to maximize the accumulation of polyphenols with high antioxidant activity, as well as acylated anthocyanins, to protect against abiotic and biotic stresses.
紫肉甘薯的贮藏根含有多种花青素和多酚。关于根系生长早期花青素和多酚的总含量及组成变化，人们了解甚少。在本研究中，我们调查了紫肉甘薯品种在移栽后15天、30天、45天和60天根系中花青素和多酚的变化。出乎意料的是，在所有生长阶段中，三个紫肉品种中酰化花青素的最高比例出现在移栽后15天。另一方面，根系生长早期的总多酚含量在贮藏根开始膨大前迅速增加，在贮藏根开始膨大时迅速下降。这些数据表明，根系生长早期是一个关键时期。这个时期可能是一种策略，可最大限度地积累具有高抗氧化活性的多酚以及酰化花青素，以抵御非生物和生物胁迫。
