Drought stress in seedlings: Lipid metabolism and Lipid peroxidation during recovery from drought in Lotus comiculatrus and Cerastium fontanum
Drought stress in seedlings: Lipid metabolism and Lipid peroxidation during recovery from drought in Lotus comiculatrus and Cerastium fontanum
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幼苗的干旱胁迫：莲花和角藻干旱恢复过程中的脂质代谢和脂质过氧化
DOI：
10.1111/j.1399-3054.1996.tb00229.x
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发表时间：
1996
影响因子：
6.4
通讯作者：
G. Hendrỳ
中科院分区：
文献类型：
--
作者：
M. Olsson;Katrina A. Nilsson;C. Liljenberg;G. Hendrỳ
种子萌发后第一天的干旱存活可能是该物种成功建立的最关键因素之一。卷耳（Cerastium fontanum Baumg.）和百脉根Lotus corniculatus L.暴露于严重干燥36小时，并在随后的17天内监测整个植物的恢复。分析揭示了这两个物种对水分胁迫的不同反应。研究了水分胁迫对耐旱性较差的L.在干旱处理后的第一个5至10天内，corniculatus的干重损失比C. fontanum和2倍的脂质过氧化（硫代巴比妥酸反应物质），三酰甘油和游离脂肪酸的上升。单半乳糖基二酰基甘油/双半乳糖基二酰基甘油的比例（MGDG/DGDG）下降了3倍，而MGDG的比例降低了约12倍。而耐旱性相对较强的毛茛幼苗则表现出较强的耐旱性。fontanum在补液后的几天内没有记录到该顺序的变化。这些变化之间的关系，在脂质代谢，脂质过氧化和干旱引起的损害方面的增长进行了讨论，在这两个物种的幼苗恢复和生存的背景下。
Seedling survival of drought during the first days following germination can be one of the most critical factors in successful establishment of the species. Seventy-two hour old seedlings of Cerastium fontanum Baumg. and Lotus corniculatus L. were exposed to severe desiccation for 36 h and the recovery of the whole plants monitored over the subsequent 17 days. The analysis exposed the very different responses to water stress in the two species. The effects of water stress on the less drought tolerant L. corniculatus within the first 5 to 10 days after drought treatment included a 2-fold larger loss in dry weight than in C. fontanum and a 2-fold rise in lipid peroxidation (thiobarbituric acid-reactive substances), in triacylglycerols and in free fatty acids. The ratio of mo-nogalactosyl diacylglycerols/digalactosyl diacylglycerols (MGDG/DGDG) declined 3-fold, while the proportion of MGDG was some 12-fold lower. In contrast, in the relatively drought-tolerant seedlings of C. fontanum no changes of this order were recorded in the days immediately following rehydration. The relationship between these changes in lipid metabolism, lipid peroxidation and drought-induced damage in terms of growth is discussed in the context of seedling recovery and survival in the two species.