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首页> 外文期刊>Acta Physiologiae Plantarum >Responses of the antioxidative enzymes in Malaysian rice (Oryza sativa L.) cultivars under submergence condition
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Responses of the antioxidative enzymes in Malaysian rice (Oryza sativa L.) cultivars under submergence condition

机译：淹没条件下马来西亚水稻品种抗氧化酶的响应

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摘要

The potential involvement of activated oxygen species by submergence stress was studied in two Malaysian rice cultivars, MR219-4 and MR219-9, and cultivar FR13A that is known to be tolerant to submergence. Seedlings of these three rice cultivars were subjected to different submergence periods (4, 8, and 12 days). Under 8 days of complete submergence, FR13A cultivar showed higher lipid peroxidation in terms of malondialdehyde level and activities of antioxidative enzymes, superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR) when compared to the MR219-4 and MR219-9 cultivars. MR219-9 showed higher SOD, APX, and GR activities after 12 days of submergence. The levels of SOD activity indicated that detoxification of O (2) (center dot-) to H2O2 was maintained at a stable level throughout the submergence stress until up to 8 days and increased rapidly at 12 days of submergence. The results indicated that tolerance to submergence in rice is associated until 8 days submergence for MR219-4 and FR13A cultivars. These findings suggested that tolerance to submergence stress in rice might be proven by increased the capacity of antioxidative system. In addition, CAT activity has much higher affinity for scavenges H2O2 than APX. Therefore, ascorbate glutathione cycle might be more efficient to scavenge H2O2.
机译：在两个马来西亚水稻品种MR219-4和MR219-9和已知耐淹水的FR13A品种中，研究了淹水胁迫下活性氧物种的潜在参与。这三个水稻品种的幼苗经历了不同的浸水期（4、8和12天）。在完全浸没的8天后，与丙二醛水平相比，FR13A品种的脂质过氧化水平更高，抗氧化酶，超氧化物歧化酶（SOD），过氧化氢酶（CAT），抗坏血酸过氧化物酶（APX）和谷胱甘肽还原酶（GR）的活性更高。 MR219-4和MR219-9品种。淹没12天后，MR219-9显示出更高的SOD，APX和GR活性。 SOD活性水平表明，在整个淹没胁迫下，O（2）（中心点）对H2O2的解毒作用一直保持稳定，直到8天，在淹没后12天迅速增加。结果表明，对于MR219-4和FR13A品种，直到淹水8天，水稻对淹水的耐受性才有相关性。这些发现表明，通过增强抗氧化系统的能力可以证明水稻对淹没胁迫的耐受性。另外，CAT活性对清除H2O2的亲和力比APX高。因此，抗坏血酸谷胱甘肽循环可能更有效地清除H2O2。

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