Hydrogen peroxide is involved in the acclimation of the Mediterranean shrub, Cistus albidus L., to summer drought.
Hydrogen peroxide is involved in the acclimation of the Mediterranean shrub, Cistus albidus L., to summer drought.
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DOI：
10.1093/jxb/ern274
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发表时间：
2009
影响因子：
6.9
通讯作者：
Alegre L
中科院分区：
文献类型：
--
作者：
Jubany-Marí T;Munné-Bosch S;López-Carbonell M;Alegre L
本研究评估了过氧化氢（H2O2）在地中海田间条件下对地中海灌木山楂（Cistus albidus L.）夏季干旱适应中的可能作用。为此，分析了一年中H2O2浓度和定位的变化。研究了H2O2随环境条件的变化、脱落酸（ABA）和氧化胁迫标志物的变化、木质素积累、木质部和厚壁组织分化以及叶面积的变化。夏季干旱时，叶片H2O2浓度增加了11倍，达到10 μmol g−1干重（DW）。这种增加主要发生在分化阶段的叶肉细胞壁、木质部导管和厚壁组织细胞。ABA水平的增加先于H2O2水平的增加，但在长时间胁迫条件下，两者同时达到峰值。由于H2O2存在于叶肉细胞外质体、木质部导管和正在分化的厚壁组织细胞中，因此可耐受高浓度H2O2。干旱胁迫下植物体内ABA和H2O2的增加可诱导抗坏血酸（AA）增加3.5倍，维持甚至降低其氧化状态，从而保护植物免受氧化损伤。夏末和秋季降雨后干旱恢复后，ABA、H2O2和AA降低到基础水平（~ 60 μmol g−1 DW、~ 1 μmol g−1 DW和~ 20 μmol g−1 DW）。
This study evaluated the possible role of hydrogen peroxide (H2O2) in the acclimation of a Mediterranean shrub, Cistus albidus L., to summer drought growing under Mediterranean field conditions. For this purpose, changes in H2O2 concentrations and localization throughout a year were analysed. H2O2 changes in response to environmental conditions in parallel with changes in abscisic acid (ABA) and oxidative stress markers, together with lignin accumulation, xylem and sclerenchyma differentiation, and leaf area were also investigated. During the summer drought, leaf H2O2 concentrations increased 11-fold, reaching values of 10 μmol g−1 dry weight (DW). This increase occurred mainly in mesophyll cell walls, xylem vessels, and sclerenchyma cells in the differentiation stage. An increase in ABA levels preceded that of H2O2, but both peaked at the same time in conditions of prolonged stress. C. albidus plants tolerated high concentrations of H2O2 because of its localization in the apoplast of mesophyll cells, xylem vessels, and in differentiating sclerenchyma cells. The increase in ABA, and consequently of H2O2, in plants subjected to drought stress might induce a 3.5-fold increase in ascorbic acid (AA), which maintained and even decreased its oxidative status, thus protecting plants from oxidative damage. After recovery from drought following late-summer and autumn rainfall, a decrease in ABA, H2O2, and AA to their basal levels (∼60 pmol g−1 DW, ∼1 μmol g−1 DW, and ∼20 μmol g−1 DW) was observed.
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影响因子：
6.9
作者：
Bolwell, GP;Bindschedler, LV;Minibayeva, F
通讯作者：
Minibayeva, F
影响因子：
6.4
作者：
Frahry, G;Schopfer, P
通讯作者：
Schopfer, P
影响因子：
3
作者：
Grant, OM;Incoll, LD
通讯作者：
Incoll, LD
影响因子：
6.4
作者：
HOHL, M;GREINER, H;SCHOPFER, P
通讯作者：
SCHOPFER, P
影响因子：
6.4
作者：
Kocsy, G;Laurie, R;de Ronde, JA
通讯作者：
de Ronde, JA