Wu Xiaojie, Chen Bicong, Xiao Jiping, Guo Huachun
College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming, Yunnan, China.
Front Plant Sci. 2023 Feb 1;14:1101172. doi: 10.3389/fpls.2023.1101172. eCollection 2023.
UltraViolet- Biological (UV-B) plays an important role in plant growth and the formation of nutrients, especially secondary metabolites.
To investigate the phenotypic changes, physiological responses, and internal genes expression of potatoes under enhanced UV-B radiation, two Yunnan native pigmented potatoes varieties named "Huaxinyangyu" and "Jianchuanhong" were exposed to different UV-B doses during whole growth duration.
Pearson correlation analysis and principal component analysis showed that the agronomic characters (i.e. plant height, pitch, stem diameter, and root shoot ratio) of plants treated with low dose ultraviolet (T1) did not change significantly compared with the absence of ultraviolet radiation (CK), even unit yield increased slightly; Similarly, under low UV-B radiation, photosynthetic and physiological parameters (photosynthetic rate, stomatal conductance, respiration rate, and transpiration rate) of leaves were significantly increased. In addition, low-dose UV-B treatment promoted the synthesis of tuber nutrients (e.g. phenols, chlorogenic acids, flavonoids, vitamin C, anthocyanins) and increased the expression of structural genes for anthocyanin synthesis. The number of nutrients and gene expression in tubers raised by the "Huaxinyangyu" was the highest at 84 days, and "Jianchuanhong" was the highest at 72 days. However, the higher dose of UV-B radiation (T2) will cause greater damage to the pigmented potatoes plants, making the plants reduce the yield, and significantly reduce the tuber nutrients.
This study showed that proper ultraviolet radiation will not harm pigmented potatoes, but also improve their oxidative stress tolerance, increase the structure genes expression of anthocyanins and continuously synthesize beneficial substances to improve the yield and quality of potato tubers.
紫外线 - 生物波段（UV - B）在植物生长和养分形成，特别是次生代谢产物的形成中起着重要作用。
为了研究增强UV - B辐射下马铃薯的表型变化、生理反应和内部基因表达，两个云南本地有色马铃薯品种“华新洋芋”和“剑川红”在整个生长期间接受不同剂量的UV - B照射。
Pearson相关性分析和主成分分析表明，与无紫外线辐射（CK）相比，低剂量紫外线处理（T1）的植株农艺性状（即株高、节间距、茎直径和根冠比）没有显著变化，甚至单位产量略有增加；同样，在低UV - B辐射下，叶片的光合和生理参数（光合速率、气孔导度、呼吸速率和蒸腾速率）显著增加。此外，低剂量UV - B处理促进了块茎养分（如酚类、绿原酸、黄酮类、维生素C、花青素）的合成，并增加了花青素合成结构基因的表达。“华新洋芋”块茎中养分数量和基因表达在84天时最高，“剑川红”在72天时最高。然而，较高剂量的UV - B辐射（T2）会对有色马铃薯植株造成更大损害，使植株减产，并显著降低块茎养分。
本研究表明，适当的紫外线辐射不会损害有色马铃薯，反而会提高其氧化应激耐受性，增加花青素的结构基因表达，并持续合成有益物质，从而提高马铃薯块茎的产量和品质。
