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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Terminalia arjuna bark extract alleviates nickel toxicity by suppressing its uptake and modulating antioxidative defence in rice seedlings
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Terminalia arjuna bark extract alleviates nickel toxicity by suppressing its uptake and modulating antioxidative defence in rice seedlings

机译：榄仁树皮提取物通过抑制水稻幼苗的镍吸收和调节抗氧化防御作用来减轻镍的毒性

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摘要

Terminalia arjuna (Ta) bark contains various natural antioxidants and has been used to protect animal cells against oxidative stress. In the present study, we have examined alleviating effects of Ta bark aqueous extract against Ni toxicity in rice (Oryza sativa L.). When rice seedlings were raised for 8 days in hydroponics in Yoshida nutrient medium containing 200 mu M NiSO4, a decline in height, reduced biomass, increased Ni uptake, loss of root plasma membrane integrity, increase in the level of O2E (TM)(-), H2O2 and E (TM) OH, increased lipid peroxidation, decline in photosynthetic pigments, increase in the level of antioxidative enzymes superoxide dismutase, catalase and glutathione peroxidase and alterations in their isoenzyme profile patterns were observed. Transmission electron microscopy (TEM) showed damage to chloroplasts marked by disorganised enlarged starch granules and disrupted thylakoids under Ni toxicity. Exogenously adding Ta bark extract (3.2 mg ml(-1)) to the growth medium considerably alleviated Ni toxicity in the seedlings by reducing Ni uptake, suppressing generation of reactive oxygen species, reducing lipid peroxidation, restoring level of photosynthesis pigments and ultrastructure of chloroplasts, and restoring levels of antioxidative enzymes. Results suggest that Ta bark extract considerably alleviates Ni toxicity in rice seedlings by preventing Ni uptake and reducing oxidative stress in the seedlings.
机译：榄仁（Ta）的树皮含有多种天然抗氧化剂，已被用于保护动物细胞免受氧化应激。在本研究中，我们研究了Ta树皮水提物对水稻（Oryza sativa L.）的Ni毒性的缓解作用。当水稻幼苗在含有200μMNiSO4的吉田营养液中通过水培法生长8天时，高度下降，生物量减少，镍吸收增加，根质膜完整性丧失，O2E（TM）水平升高（- ），H2O2和E（TM）OH，脂质过氧化增加，光合色素下降，抗氧化酶超氧化物歧化酶，过氧化氢酶和谷胱甘肽过氧化物酶水平增加以及它们的同工酶谱模式发生变化。透射电子显微镜（TEM）显示，在镍的毒性作用下，叶绿体受到破坏，其特征在于淀粉颗粒变乱，杂乱无章的类囊体。在生长培养基中外加Ta皮提取物（3.2 mg ml（-1）），可通过减少Ni的吸收，抑制活性氧的产生，减少脂质过氧化，恢复光合作用色素的水平和叶绿体的超微结构，大大减轻幼苗中的Ni毒性。 ，并恢复抗氧化酶的水平。结果表明，塔克树皮提取物可通过防止镍吸收并减少幼苗中的氧化应激而大大减轻水稻幼苗中的镍毒性。

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