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首页> 外文期刊>Australian Journal of Crop Science >Protective role of glycinebetaine in maize against drought-induced lipid peroxidation by enhancing capacity of antioxidative system
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Protective role of glycinebetaine in maize against drought-induced lipid peroxidation by enhancing capacity of antioxidative system

机译：甘氨酸甜菜碱通过增强抗氧化系统的能力在玉米中对抗干旱引起的脂质过氧化的保护作用

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A pot-culture study was performed to investigate the efficacy of glycinebetaine (GB) for drought tolerance in two contrasting maize cultivars. Progressive drought stress noticeably reduced the relative leaf water content (RLWC) but increased protein and proline concentrations in both cultivars. The reduction in RLWC in DD-60 was lower than ND-95, whereas, the accumulation of protein and proline was substantially higher in DD-60 over ND-95 during experimental period. Nonetheless, GB-treatment led to increase in RLWC, protein and proline accumulation in DD-60 than ND-95. Prolonged drought stress induced the membrane lipid peroxidation, which was more severe in ND-95 than DD-60. GB-treatment substantially ameliorated the lipid peroxidation in DD-60 over ND-95 under drought stress. The activity of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) were substantially enhanced in DD-60 than ND-95 with the prolongation of drought stress at beginning and then declined subsequently. These results possibly suggest that the DD-60 showed a better protection mechanism against water-induced lipid peroxidation by maintaining higher constitutive activities of antioxidant enzymes than ND-95. Nevertheless, GB-treated plants maintained higher antioxidant enzymes activity during drought stress than non-GB treated plants, which ultimately enhanced the growth, yield and yield components. The foliar application of glycinebetaine only considered advantageous when applied under drought and exhibit pronounced effects when applied at flowering. Drought tolerance can be improved in maize by the foliar GB-treatment through enhancing the antioxidants capacity.
机译：进行了盆栽研究，以研究甘氨酸甜菜碱（GB）在两个相反的玉米品种中的耐旱性。渐进干旱胁迫明显降低了两个品种的相对叶含水量（RLWC），但增加了蛋白质和脯氨酸的浓度。在实验期间，DD-60中RLWC的降低低于ND-95，而DD-60中的蛋白质和脯氨酸的积累明显高于ND-95。然而，与ND-95相比，GB处理导致DD-60中RLWC，蛋白质和脯氨酸的积累增加。长期干旱胁迫引起膜脂过氧化，ND-95比DD-60更严重。在干旱胁迫下，GB处理显着改善了ND-60上DD-60中脂质过氧化作用。在DD-60中，超氧化物歧化酶（SOD），过氧化物酶（POD）和过氧化氢酶（CAT）的活性比ND-95显着提高，开始时干旱胁迫时间延长，然后下降。这些结果可能表明，DD-60通过保持比ND-95更高的抗氧化酶本构活性，从而显示出更好的针对水诱导的脂质过氧化的保护机制。然而，在干旱胁迫下，GB处理的植物比非GB处理的植物保持较高的抗氧化酶活性，这最终增强了生长，产量和产量构成。叶面施用甘氨酸甜菜碱仅在干旱条件下才被认为是有利的，而在开花时则表现出明显的作用。叶面GB处理可通过增强抗氧化剂的含量来提高玉米的耐旱性。

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