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Environmental Pollution:纳米硒对茶树叶片氧化应激的潜在影响

农业环境科学微信公众号 2021年01月22日 报道 浏览次数:

中国农业大学潘灿平教授团队通过为期两年的田间试验,研究了纳米硒对茶树叶片氧化应激的潜在影响。相关成果发表于Environmental Pollution(IF=6.792)。

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Highlights

•Long-term use of pesticides reduced the stresses resistance of tea.

•Nanoselenium increased the nutrients and secondary metabolites of tea.

•The aroma of tea with rich fragrance was formed by nanoselenium biofortification.

•Nanoselenium enhanced the defense response of tea for a two-year field experiment.

Abstract

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.

植物和土壤中的农药胁迫被密切关注,因为它会影响作物的抗氧化系统、营养物质和风味。虽然硒(Se)能增强植物的抗性,但在长期农药胁迫下,纳米硒对茶树的保护机制尚不清楚。通过为期两年的田间试验,研究了纳米硒对茶树叶片氧化应激的潜在影响。与对照相比,纳米硒(10 mg/L)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。研究发现,高水平的茶氨酸、谷氨酸、脯氨酸和精氨酸最有可能是通过调节GS-GOGAT循环诱导的。硒的补充可以促进茶叶的次生代谢,从而增加总酚和类黄酮(芹菜素、山奈酚、槲皮素、杨梅素和芦丁)的积累,还能通过激活AsA-GSH循环等抗氧化酶来减少丙二醛、过氧化氢和超氧阴离子的积累。富硒茶也表现出较好的香气和风味。综上所述,纳米硒可以改善作物的营养品质和抗非生物胁迫能力。

农业环境科学微信公众号2021年1月22日

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