Seasonal changes in abiotic stress tolerance and concentrations of tocopherol, sugar, and ascorbic acid in sea buckthorn leaves and stems
Seasonal changes in abiotic stress tolerance and concentrations of tocopherol, sugar, and ascorbic acid in sea buckthorn leaves and stems
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DOI：
10.1016/j.scienta.2013.09.039
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发表时间：
2013-12-17
影响因子：
4.3
通讯作者：
Kanahama, Koki
中科院分区：
文献类型：
--
作者：
Kanayama, Yoshinori;Sato, Kazuyoshi;Kanahama, Koki
研究人员在不同季节测定了沙棘叶和茎的胁迫耐受性和与胁迫相关的代谢物浓度，沙棘被认为与主要落叶果树相比是一种高度耐受胁迫的植物。随着温度的升高，沙棘叶的电解质泄漏在 51 摄氏度时最低达到 20% 或更低。相比之下，在-40摄氏度、最冷的时期，沙棘茎中的电解质泄漏率低于20%，并且在1月份几乎检测不到。耐热性的变化对应于生育酚浓度的变化，而耐冻性的变化对应于棉子糖和抗坏血酸浓度的变化，这表明冬季特定的生产以及蔗糖和葡萄糖。沙棘的耐热、耐旱、耐冻能力高于苹果、梨；较高的耐热性和耐冷冻性可能分别与生育酚、蔗糖和抗坏血酸的浓度有关。由于很少有研究同时研究不同季节的多种胁迫和代谢物，因此这项研究，特别是涉及冬季抗坏血酸的急剧积累以及生育酚在耐热性中的作用，将为全面了解果树的胁迫适应提供新的见解。 (C) 2013 Elsevier B.V. 保留所有权利。
Stress tolerance and stress-related metabolite concentrations were determined over different seasons in leaves and stems of sea buckthorn, which is believed to be a highly stress-tolerant plant compared with major deciduous fruit trees. Electrolyte leakage in sea buckthorn leaves reached a minimum of 20% or less at 51 degrees C, with an increase in temperature. In contrast, electrolyte leakage in sea buckthorn stems was less than 20% at -40 degrees C, during the coldest period, and was almost undetectable in January. A change in heat tolerance corresponded to an alteration of tocopherol concentration, whereas a change in freezing tolerance corresponded to changes in raffinose and ascorbic acid concentrations, which indicated winter-specific production, along with sucrose and glucose. Heat, drought, and freezing tolerance in sea buckthorn were higher than those in apple and pear; the higher heat and freezing tolerance may be related to tocopherol and sucrose and ascorbic acid concentrations, respectively. Because few studies have simultaneously investigated multiple stresses and metabolites across different seasons, this study, particularly involving the dramatic accumulation of ascorbic acid in winter and the role of tocopherol in heat tolerance, will provide new insights into a comprehensive understanding of stress acclimation in fruit trees. (C) 2013 Elsevier B.V. All rights reserved.