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首页> 外文期刊>African Journal of Biotechnology >Copper-induced changes in growth and antioxidative mechanisms of tea plant (Camellia sinensis (L.) O. Kuntze)
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Copper-induced changes in growth and antioxidative mechanisms of tea plant (Camellia sinensis (L.) O. Kuntze)

机译：铜诱导的茶树生长和抗氧化机制的变化（Camellia sinensis（L.）O. Kuntze）

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Tea is the oldest, most popular, non-alcoholic caffeine containing beverage in the world. Tea plants are prone to the attack of many diseases which can be controlled by the treatment of pesticides. These pesticides contain heavy metal which prolonged accumulation can lead to the damage of crop yield both in quantity and quality. In the present study, we observed the effects of high concentration of Cu stress on physiological and biochemical parameters. The tea cultivars (S3A3 and TS-491) were collected from the Rosekandi Tea Estate, Silchar, Assam. The accumulation of Cu in the different parts of the tea plants had a positive correlation with the Cu stress. The accumulation of Cu was higher in roots than in leaves and also the new stems. The results show gradual decrease in the photosynthetic activity with the increase in the concentration of the Cu stress in both the cultivars. The activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) increased with the increase in the Cu concentration but remarkably in different manner in both the cultivars. The activities of antioxidants ascorbate peroxidase (APX), CAT, SOD and POD in cultivar S3A3 increased up to 500 μM and at 600 μM showed a low rate of increase whereas TS-491was tolerant up to 400 μM. The responses in the oxidative stress were characterized by an accumulation of malondialdehyde (MDA). Phenol content has also positive correlation with increase in the concentration in both the cultivars up to 500 μM. Finally it was concluded that Cu is tolerant to the cultivars of tea plant to some extent (specifically at lower concentration), but at higher concentration (beyond 400 μM) of Cu with exposure time, tea plant had a strong inhibition of growth by damaging the normal metabolism.
机译：茶是世界上最古老，最受欢迎的不含酒精的咖啡因饮料。茶树很容易受到许多疾病的侵袭，而这些疾病可以通过使用农药来控制。这些农药含有重金属，长期积累会导致作物产量和质量受到损害。在本研究中，我们观察到高浓度的铜胁迫对生理和生化参数的影响。茶品种（S3A3和TS-491）是从阿萨姆邦Silchar的Rosekandi茶园收集的。茶树不同部位的铜积累与铜胁迫呈正相关。根中的铜积累量高于叶片和新茎。结果表明，随着两个品种中铜胁迫浓度的增加，光合活性逐渐降低。随着铜浓度的增加，超氧化物歧化酶（SOD），过氧化物酶（POD）和过氧化氢酶（CAT）的活性增加，但在两个品种中的活性均显着不同。品种S3A3中抗氧化剂抗坏血酸过氧化物酶（APX），CAT，SOD和POD的活性增加至500μM，在600μM时表现出较低的增加速率，而TS-491的耐受性高达400μM。氧化应激中的响应以丙二醛（MDA）的积累为特征。苯酚含量与两个品种中直至500μM的浓度增加也呈正相关。最后得出的结论是，铜在一定程度上耐受茶树的品种（特别是在较低的浓度下），但是在较高浓度（超过400μM）的铜下，随着暴露时间的延长，茶树通过破坏茶树对生长具有强烈的抑制作用。正常的新陈代谢。

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