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Alternative oxidase pathway is likely involved in waterlogging tolerance of watermelon
Scientia Horticulturae ( IF 4.3 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.scienta.2020.109831
Jiawen Zheng , Quansheng Ying , Chunying Fang , Nan Sun , Menglu Si , Jing Yang , Biao Zhu , Yong-Ling Ruan , Zhujun Zhu , Yong He

Abstract Watermelon (Citrullus lanatus) is an important crop worldwide and its growth is highly susceptible to waterlogging. However, it remains unknown how tolerant and intolerant genotypes may respond to waterlogging. To address this issue, we examined a waterlogging tolerant cultivar ‘YL’ in the field and compared it with a sensitive cultivar ‘Zaojia8424’ under waterlogging. ‘YL’ exhibited higher activity of alternative oxidase (AOX), enhanced levels of AOX, and increased KCN-resistant respiration rate, as compared with the sensitive cultivar ‘Zaojia8424’. Accordingly, ‘YL’ had lower contents of O2 −, H2O2 and malonaldehyde, compared with ‘Zaojia8424’. Furthermore, inhibition of AOX pathway by salicylhydroxamic acid exacerbated inhibition of plant growth, promoted the accumulation of O2 − and H2O2, decreased the respiration rate in both cultivars, and diminished the positive effects by AOX observed in ‘YL’. We observed no significant differences between ‘YL’ and ‘Zaojia8424’ in terms of the rate of anaerobic respiration and cytochrome respiration, and expression levels of antioxidant genes. Thus we concluded that the high activity of AOX pathway contributed to the waterlogging tolerance in watermelon via maintaining of the respiratory and alleviation of oxidative damage.

中文翻译:

替代氧化酶途径可能与西瓜耐涝有关

摘要 西瓜(Citrullus lanatus)是世界范围内的重要作物,其生长极易受涝。然而,耐受和不耐受基因型对涝渍的反应仍然未知。为了解决这个问题,我们在田间检查了一个耐涝品种'YL',并将其与耐涝的敏感品种'枣家8424'进行了比较。与敏感品种 'Zaojia8424' 相比,'YL' 表现出更高的替代氧化酶 (AOX) 活性,提高 AOX 水平,并增加抗 KCN 呼吸率。因此,与“枣家8424”相比,“YL”的O2 -、H2O2 和丙二醛含量较低。此外,水杨基异羟肟酸对 AOX 通路的抑制加剧了对植物生长的抑制,促进了 O2 - 和 H2O2 的积累,降低了两个品种的呼吸速率,并减少了在“YL”中观察到的 AOX 的积极影响。我们观察到'YL'和'Zaojia8424'在无氧呼吸和细胞色素呼吸的速率以及抗氧化基因的表达水平方面没有显着差异。因此我们得出结论,AOX途径的高活性通过维持呼吸和减轻氧化损伤促进了西瓜的耐涝能力。
更新日期:2021-02-01
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