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Osmoprotectants and Antioxidative Enzymes as Screening Tools for Salinity Tolerance in Radish (Raphanus sativus)
Horticultural Plant Journal ( IF 5.7 ) Pub Date : 2019-09-21 , DOI: 10.1016/j.hpj.2019.09.001
Rabab Sanoubar , Antonio Cellini , Giuseppe Gianfranco , Francesco Spinelli

The research addresses the identification of a screening methodology for salt stress tolerance in radish cultivars. In the first experiment, two different radish cultivars (long white and round red) were compared in their morphological and physiological responses to different salinity levels. Round red radish showed better morphological and physiological responses to incremental salinity in terms of yield and better adaptation of overall water relations. In the second experiment, the most tolerant genotype from the first experiment was used as a control against other seven round red radish genotypes ranked by their salinity tolerance according to morphological, physiological and biochemical indices. Salt stress did not significantly affect malondialdehyde (MDA) and hydrogen peroxide (H2O2) content, and ascorbate peroxidase (APX) activity in the studied cultivars. Nonetheless, the relatively salt tolerant cultivar SAXA2 showed higher ability to accumulate compatible solutes (e.g. proline and proteins) and maintain osmotic adjustment. In addition, cultivar SAXA2 also showed considerable increase in glutathione reductase (GR) activity. Our results supported that accumulation of proline and higher GR activity are associated with radish salt tolerance, whereas no relationship with salinity was observed in superoxide dismutase (SOD), MDA and H2O2 content.



中文翻译:

渗透保护剂和抗氧化酶作为筛选工具用于在萝卜耐盐性(萝卜

该研究致力于确定萝卜品种耐盐胁迫的筛选方法。在第一个实验中,比较了两个不同的萝卜品种(长白色和圆形红色)对不同盐度水平的形态和生理响应。圆形萝卜对产量增加的盐分表现出更好的形态和生理响应,对整体水分关系的适应性更好。在第二个实验中,将第一个实验中耐受性最高的基因型用作对照,根据形态,生理和生化指标对其他七个圆形萝卜的基因型按盐度耐受性进行排序。盐胁迫对丙二醛(MDA)和过氧化氢 H 2Ò 2 的内容,以及抗坏血酸过氧化物酶(APX)在所研究的品种活性。但是,相对耐盐的品种SAXA2表现出更高的能力,可以累积相容的溶质(例如脯氨酸和蛋白质)并保持渗透调节。此外,品种SAXA2还显示出谷胱甘肽还原酶(GR)活性的显着增加。我们的研究结果支持脯氨酸的积累和较高的GR活性与萝卜的耐盐性有关,而在超氧化物歧化酶(SOD),MDA和H 2 O 2含量方面与盐度没有关系。

更新日期:2019-09-21
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