BACKGROUND Tea is one of the most popular beverages in the world. There are many secondary metabolites can be found in tea such as anthocyanins, proanthocyanidins, flavonols and catechins. These secondary metabolites in plants are proved to act protective components for human health effect. Plant hormone ethylene is considered to have an important role in regulation of plant development and signal transduction. This study evaluated the effect of ethylene signaling regulation in phenolic compounds in tea plants. The ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) enhanced contents of total catechin in treated oolong tea seedlings. RESULTS The degree of epigallocatechin and epicatechin galloylation was increased after ACC treatment in oolong tea seedlings by high performance liquid chromatography determination. The contents of anthocyanins, flavonoids, and total polyphenol were higher after ACC treatment in comparison with control. Antioxidant enzyme such as catalase, superoxide dismutase, and total peroxidase decreased their antioxidant activities after ACC treatment, yet the activity of ascorbate peroxidase is increased. The ability of oxygen radical absorption and 2,2-diphenyl-1-picrylhydrazyl was used to evaluate the antioxidant activity, which was enhanced by ACC treatment. CONCLUSIONS Taken together the results of this study demonstrate that the ethylene signaling is involved in modulation of secondary metabolites accumulation and antioxidant ability that to enhance the benefit of human health in tea products.

中文翻译：

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乙烯信号调节茶花中儿茶素的含量和抗氧化能力。

背景技术茶是世界上最受欢迎的饮料之一。茶中可以发现许多次级代谢产物，例如花青素，原花青素，黄酮醇和儿茶素。事实证明，植物中的这些次生代谢产物起着保护人类健康的保护作用。植物激素乙烯被认为在调节植物发育和信号转导中具有重要作用。这项研究评估了茶树中乙烯信号调控酚类化合物的作用。乙烯前体1-氨基环丙烷-1-羧酸（ACC）提高了处理过的乌龙茶苗中总儿茶素的含量。结果高效液相色谱法测定了乌龙茶苗中ACC处理后表没食子儿茶素和表儿茶素没食子酸酯化的程度。ACC处理后，花青素，类黄酮和总多酚的含量均高于对照。过氧化氢酶，超氧化物歧化酶和总过氧化物酶等抗氧化酶在ACC处理后降低了其抗氧化活性，但抗坏血酸过氧化物酶的活性却增加了。使用氧自由基吸收能力和2,2-二苯基-1-吡啶并肼基来评估抗氧化活性，该抗氧化活性通过ACC处理得以增强。结论总之，这项研究的结果表明，乙烯信号参与了次级代谢产物的积累和抗氧化能力的调节，从而增强了茶产品对人类健康的益处。超氧化物歧化酶和总过氧化物酶降低了ACC处理后的抗氧化活性，而抗坏血酸过氧化物酶的活性却增加了。使用氧自由基吸收能力和2,2-二苯基-1-吡啶并肼基来评估抗氧化活性，该抗氧化活性通过ACC处理得以增强。结论总之，这项研究的结果表明，乙烯信号参与了次级代谢产物的积累和抗氧化能力的调节，从而增强了茶产品对人类健康的益处。超氧化物歧化酶和总过氧化物酶降低了ACC处理后的抗氧化活性，而抗坏血酸过氧化物酶的活性却增加了。使用氧自由基吸收能力和2,2-二苯基-1-吡啶并肼基来评估抗氧化活性，该抗氧化活性通过ACC处理得以增强。结论总之，这项研究的结果表明，乙烯信号参与了次级代谢产物的积累和抗氧化能力的调节，从而增强了茶产品对人类健康的益处。通过ACC治疗得到增强。结论总之，这项研究的结果表明，乙烯信号参与了次级代谢产物的积累和抗氧化能力的调节，从而增强了茶产品对人类健康的益处。通过ACC治疗得到增强。结论总之，这项研究的结果表明，乙烯信号参与了次级代谢产物的积累和抗氧化能力的调节，从而增强了茶产品对人类健康的益处。