PDF(Pubmed)
Abstract：
Hydrogen peroxide (H2O2) plays a central role in responses to salt stress, a major abiotic stress that impacts crop yield worldwide. Despite the evidence that H2O2 mitigates salt stress and improves post-harvest quality on several species, its effects on radish were not investigated so far. Thus, the objective of this study was to evaluate the exogenous application of H2O2 on salt stress mitigation of radish growth, physiology, and post-harvest quality. For this, radish plants were grown in pots for 30 days, being watered with non-saline (0.31 dS m-1) or saline water (120 mM NaCl, 12.25 dS m-1). Plants were leaf-sprayed weekly with water (control - 0 µM H2O2) or H2O2 (150 or 1500 µM) solutions. The experimental design was completely randomized in a 3 × 2 factorial scheme (H2O2 treatments × salt stress conditions). The growth, physiology (gas exchanges, photochemical efficiency, relative water content, electrolyte leakage, and the contents of chlorophylls and carotenoids), and post-harvest attributes of globular roots (color, anthocyanins, vitamin C, phenolic compounds, and soluble solids) were determined. Salt stress decreased gas exchanges and increased electrolyte leakage, which resulted in stunted radish growth, and increased the contents of antioxidants, such as anthocyanins, soluble solids, and vitamin C, improving globular root quality. Conversely, H2O2 did not mitigate salt stress effects on radish growth, photosynthetic capacity, and oxidative damages. Although H2O2 increased vitamin C under non-stressed condition, it was decreased under salt stress. Thus, we conclude that H2O2 did not mitigate salt stress on radish growth and quality.
UNASSIGNED: The online version contains supplementary material available at 10.1007/s12298-024-01476-z.
UNASSIGNED: The online version contains supplementary material available at 10.1007/s12298-024-01476-z.
摘要：
过氧化氢（H2O2）在响应盐胁迫中起着核心作用，影响全球作物产量的主要非生物胁迫。尽管有证据表明H2O2可以减轻盐胁迫并改善几种物种的收获后质量，到目前为止，还没有研究它对萝卜的影响。因此，本研究的目的是评估外源施用H2O2对盐胁迫缓解萝卜生长的影响,生理学,和收获后的质量。为此，萝卜植物在盆中生长30天，用非盐水(0.31dSm-1)或盐水(120mMNaCl，12.25dSm-1)。每周用水（对照-0μMH2O2）或H2O2（150或1500μM）溶液对植物进行叶面喷雾。实验设计在3×2阶乘方案（H2O2处理×盐胁迫条件）中完全随机化。增长，生理学(气体交换，光化学效率，相对含水量,电解液泄漏,以及叶绿素和类胡萝卜素的含量），和球形根的收获后属性(颜色，花青素,维生素C,酚类化合物，和可溶性固体)进行测定。盐胁迫减少了气体交换，增加了电解质泄漏，导致萝卜生长迟缓，增加了抗氧化剂的含量，比如花青素,可溶性固体，和维生素C,改善球状根质量。相反，H2O2没有减轻盐胁迫对萝卜生长的影响，光合能力，和氧化损伤。尽管H2O2在非应激条件下增加了维生素C，在盐胁迫下下降。因此，我们得出结论，H2O2不能减轻盐胁迫对萝卜生长和品质的影响。
■在线版本包含补充材料，可在10.1007/s12298-024-01476-z获得。
■在线版本包含补充材料，可在10.1007/s12298-024-01476-z获得。
