Abstract The balance between oxidative stress and antioxidant defense system was investigated in roots of the cold-sensitive (cvs. BRS Rubissol and BRS Cuia) and cold-tolerant (cv. Beauregard) sweet potato stored at 6 or 13 °C for 60 d. We hypothesized that the absence of chilling injury symptoms on cv. Beauregard stored at 6 °C depends on the induction capacity of enzymatic and non-enzymatic antioxidant systems. The manifestation of chilling injury symptoms on cvs. BRS Rubissol and BRS Cuia were associated with the loss of membrane integrity, increased lipid peroxidation, accumulation of hydrogen peroxide (H2O2), and low catalase (CAT) and ascorbate peroxidase (APX) activities. In these cold-sensitive cultivars, proline and total phenolics increased with the progression of chilling injury, acting as markers for cold sensitivity, and parallel increased activity of phenylalanine ammonia-lyase. In contrast, constitutive levels of enzymatic and non-enzymatic antioxidants, as well as stress-induced increased CAT and APX activity played an important role in the detoxification of H2O2 in the tolerant cv. Beauregard. Our results suggest that the balance between oxidative stress and antioxidant system is involved in the tolerance of cv. Beauregard to chilling injury.

中文翻译：

---

氧化应激和抗氧化系统之间的平衡与甘薯根的耐寒水平有关

摘要 研究了耐冷（cvs. BRS Rubissol 和 BRS Cuia）和耐寒（cv. Beauregard）甘薯在 6 或 13 °C 下储存 60 d 的根部氧化应激和抗氧化防御系统之间的平衡。我们假设 cv 上没有冷损伤症状。Beauregard 储存在 6 °C 取决于酶促和非酶促抗氧化系统的诱导能力。cvs上寒害症状的表现。BRS Rubissol 和 BRS Cuia 与膜完整性丧失、脂质过氧化增加、过氧化氢 (H2O2) 积累以及过氧化氢酶 (CAT) 和抗坏血酸过氧化物酶 (APX) 活性降低有关。在这些冷敏感品种中，脯氨酸和总酚类物质随着冷害的进展而增加，作为冷敏感的标志物，并同时增加苯丙氨酸解氨酶的活性。相比之下，酶促和非酶促抗氧化剂的组成水平，以及应激诱导的 CAT 和 APX 活性增加，在耐受性 cv. 中的 H2O2 解毒中发挥了重要作用。博勒加德。我们的结果表明氧化应激和抗氧化系统之间的平衡参与了cv的耐受性。Beauregard 冰冷的伤害。