中國農(nóng)業(yè)大學(xué)潘燦平教授團(tuán)隊(duì)通過為期兩年的田間試驗(yàn)，研究了納米硒對茶樹葉片氧化應(yīng)激的潛在影響。相關(guān)成果發(fā)表于Environmental Pollution（IF=6.792）。
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.
農(nóng)藥作為一種在植物和土壤中的出現(xiàn)的新的脅迫被密切關(guān)注，因?yàn)樗鼤?huì)影響作物的抗氧化系統(tǒng)、營養(yǎng)物質(zhì)和風(fēng)味。雖然硒（Se）能增強(qiáng)植物的抗性，但在長期農(nóng)藥脅迫下，納米硒對茶樹的保護(hù)機(jī)制尚不清楚。通過為期兩年的田間試驗(yàn)，研究了納米硒對茶樹葉片氧化應(yīng)激的潛在影響。與對照相比，納米硒（10 mg/L）顯著提高了蛋白質(zhì)、可溶性糖、類胡蘿卜素、茶多酚和兒茶素的含量。研究發(fā)現(xiàn)，高水平的茶氨酸、谷氨酸、脯氨酸和精氨酸最有可能是通過調(diào)節(jié)GS-GOGAT循環(huán)誘導(dǎo)的。硒的補(bǔ)充可以促進(jìn)茶葉的次生代謝，從而增加總酚和類黃酮（芹菜素、山奈酚、槲皮素、楊梅素和蘆?。┑姆e累，還能通過激活A(yù)sA-GSH循環(huán)等抗氧化酶來減少丙二醛、過氧化氫和超氧陰離子的積累。富硒茶也表現(xiàn)出較好的香氣和風(fēng)味。綜上所述，納米硒可以改善作物的營養(yǎng)品質(zhì)和抗非生物脅迫能力。
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