Li Dong, Zhou Chunran, Zou Nan, Wu Yangliu, Zhang Jingbang, An Quanshun, Li Jia-Qi, Pan Canping
Innovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, 100193, China.
College of Plant Protection, Shandong Agricultural University, Shandong, 271000, China.
Environ Pollut. 2021 Jan 18;273:116503. doi: 10.1016/j.envpol.2021.116503.
An emerging stress of pesticides in plant and soil is closely watched as it affects crop antioxidant systems, nutritional quality, and flavor. Although selenium (Se) can enhance the resistance of plants, the protective mechanism of nanoselenium is still not known under the long-term pesticide stress in tea trees. In this study, we investigated the potential effects of foliar application of nanoselenium for a two-year field experiment on tea plants under pesticide-induced oxidative stress. Compared to control, nano-Se (10 mg/L) markedly enhanced the protein, soluble sugar, carotenoid, tea polyphenols, and catechins contents. High levels of theanine, glutamic acid, proline, and arginine were found to be induced most likely by adjusting the GS-GOGAT cycle. Se-supplementation may promote tea leaves' secondary metabolism, thus increasing the accumulation of total phenols and flavonoids (apigenin, kaempferol, quercetin, myricetin, and rutin). It also minimized the accumulation of malondialdehyde, hydrogen peroxide, and superoxide anion by activating the antioxidants enzymes including in the AsA-GSH cycle. Selenium-rich tea also showed better fragrance and flavor. In summary, nano-Se can ameliorate the nutrients quality and abiotic stresses resistance of crops.
植物和土壤中农药产生的新胁迫受到密切关注，因为它会影响作物的抗氧化系统、营养品质和风味。尽管硒（Se）可以增强植物的抗性，但在茶树长期受农药胁迫的情况下，纳米硒的保护机制仍不清楚。在本研究中，我们通过为期两年的田间试验，研究了叶面喷施纳米硒对处于农药诱导氧化胁迫下茶树的潜在影响。与对照相比，纳米硒（10毫克/升）显著提高了蛋白质、可溶性糖、类胡萝卜素、茶多酚和儿茶素的含量。高水平的茶氨酸、谷氨酸、脯氨酸和精氨酸很可能是通过调节谷氨酰胺合成酶-谷氨酸合酶（GS-GOGAT）循环诱导产生的。补充硒可能促进茶叶的次生代谢，从而增加总酚和黄酮类化合物（芹菜素、山奈酚、槲皮素、杨梅素和芦丁）的积累。它还通过激活包括抗坏血酸-谷胱甘肽（AsA-GSH）循环中的抗氧化酶，将丙二醛、过氧化氢和超氧阴离子的积累降至最低。富硒茶还表现出更好的香气和风味。总之，纳米硒可以改善作物的营养品质和抗非生物胁迫能力。
