Different effects of chilling on respiration in leaves and roots of cucumber (Cucumis sativus)
Different effects of chilling on respiration in leaves and roots of cucumber (Cucumis sativus)
复制标题
低温对黄瓜叶和根呼吸的不同影响
DOI：
10.1016/j.plaphy.2006.10.016
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发表时间：
2006-11-01
影响因子：
6.5
通讯作者：
Yu, J. Q.
中科院分区：
文献类型：
--
作者：
Hu, W. H.;Shi, K.;Yu, J. Q.
以黄瓜为试材，研究了低温胁迫对黄瓜叶片和根部呼吸作用(耐假胁迫、细胞色素途径和抗KCN途径)、温度敏感性、相对电解质电导率和氧化胁迫程度(过氧化氢和丙二醛含量)的影响。在8℃下冷藏4天后，根的总呼吸和抗KCN呼吸在不同的测量温度下都有所增加。相比之下，抗假呼吸则保持不变。相比之下，冷害显著降低了叶片的总呼吸强度，这主要是由于假呼吸的减少所致。低温明显降低了耐KCN呼吸对温度变化的敏感性。UQr/UQt的减少水平在冷藏叶片和根中都有所增加，而丙酮酸含量只在冷藏根中增加，而在冷藏叶片中没有增加。此外，叶片中过氧化氢和丙二醛含量的增加幅度远大于根。从组织中渗漏的离子也有同样的趋势。综上所述，这些结果表明，根的耐冷性与其高的总呼吸和抗KCN的呼吸有关。(C)2006年爱思唯尔·马森公司。版权所有。
The effects of chilling on respiration (SHAM-resistant, cytochrome pathway and KCN-resistant, alternative pathway), temperature sensitivity, relative electrolyte conductivity, and degrees of oxidative stress (H2O2 and malonaldehyde (MDA) contents) were separately examined in leaves and roots of cucumber (Cucumis sativits L.). After chilling at 8 degrees C for 4 days, both total respiration and KCN-resistant respiration in roots increased at different measurement temperatures. In contrast, SHAM-resistant respiration remained unchanged. In comparison, chilling significantly decreased the total respiration in leaves and this decrease was mostly due to a decrease in SHAM-resistant respiration. Chilling apparently decreased the sensitivity of KCN-resistant respiration to changes of temperature. The reduction levels of ubiquinone pool (UQr/UQt) increased both in chilled leaves and roots whilst pyruvate content increased only in chilled roots, but not in chilled leaves. Furthermore increases of H2O2 and MDA contents were much greater in leaves than in roots. The same trend was also observed for ion leakage from tissues. Taken together, the results suggested that the higher chilling tolerance of roots was associated with their high total respiration and KCN-resistant respiration. (c) 2006 Elsevier Masson SAS. All rights reserved.