Nitrogen nutrient status induces sexual differences in responses to cadmium in Populus yunnanensis.
Nitrogen nutrient status induces sexual differences in responses to cadmium in Populus yunnanensis.
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氮营养状况导致云南杨对镉的反应存在性别差异
DOI：
10.1093/jxb/err203
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发表时间：
2011-10
影响因子：
6.9
通讯作者：
Li C
中科院分区：
文献类型：
--
作者：
Chen L;Han Y;Jiang H;Korpelainen H;Li C
以云南杨（Populus yunnanensis）为模式植物，研究了镉（Cd）胁迫、氮（N）沉降及其复合胁迫下云南杨生长、生理生化和超微结构的差异。与对照条件相比，Cd降低了植物的生物量，破坏了光合机构，表现为降低了光系统II的最大效率（PSII; Fv/Fm）和PSII的有效量子产率（Yield），降低了气体交换能力，并诱导了氧化胁迫，表现为抗氧化酶的破坏和活性氧（ROS）的积累。另一方面，镉的毒性减轻了恢复的气体交换能力，减少活性氧，并改善氧化还原不平衡在两个性别时，氮沉积。然而，男性表现出更高的气体交换能力，较低的酶抑制和活性氧积累，更强的能力，以维持细胞的氧化还原平衡，以及更好地维护叶绿体超微结构比女性单独暴露于镉胁迫。虽然男性表现出较高的镉含量在叶片中比女性，男性也积累了较高水平的非蛋白硫醇（NP-SH）和游离氨基酸（FAA）的解毒比女性。镉诱导的性别差异，可见，例如，在Fv/Fm，产量，净光合速率（A），气孔导度（gs），减少氮沉降下，作为性别之间的差异不存在在这些参数下的组合处理。结果表明，雌性比雄性对镉胁迫更敏感，遭受的伤害更大。此外，氮沉降可以减轻镉的毒性，减少镉敏感性的性别差异。
Populus yunnanensis was employed as a model species to detect sexual differences in growth, physiological, biochemical, and ultrastructural responses to cadmium (Cd) stress, nitrogen (N) deposition, and their combination. Compared with the control conditions, Cd decreased plant biomass, damaged the photosynthetic apparatus, visible as a decreased maximum efficiency of photosystem II (PSII; Fv/Fm) and effective quantum yield of PSII (Yield), depressed gas exchange capacity, and induced oxidative stress, visible as the disruption of antioxidative enzymes and accumulation of reactive oxygen species (ROS), in both sexes. On the other hand, Cd toxicity was mitigated by the recovery of gas exchange capacity, a decrease in ROS, and improvement of the redox imbalance in both sexes when N deposition was applied. However, males showed a higher gas exchange capacity, lower enzyme inhibition and ROS accumulation, stronger abilities to maintain cellular redox homeostasis, and a better maintenance of chloroplast ultrastructure than did females when exposed to Cd stress alone. Although males exhibited a higher Cd content in leaves than did females, males also accumulated higher levels of non-protein thiols (NP-SHs) and free amino acids (FAAs) for detoxification than did females. Sexual differences induced by Cd, visible, for example, in Fv/Fm, Yield, net photosynthesis rate (A), and stomatal conductance (gs), decreased under N deposition, as no significant differences between the sexes existed in these parameters under the combined treatment. The results indicated that females are more sensitive to Cd stress and suffer more injuries than do males. Moreover, N deposition can mitigate Cd toxicity and decrease sexual differences in Cd sensitivity.
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影响因子：
4
作者：
Li, Chunyang;Xu, Gang;Berninger, Frank
通讯作者：
Berninger, Frank
影响因子：
3.4
作者：
Kieffer, Pol;Dommes, Jacques;Renaut, Jenny
通讯作者：
Renaut, Jenny
云南杨对干旱和盐度相互作用的性别相关适应性反应
影响因子：
7.3
作者：
Chen, Lianghua;Zhang, Sheng;Li, Chunyang
通讯作者：
Li, Chunyang
影响因子：
7.3
作者：
Garnier, Lionel;Simon-Plas, Francoise;Montillet, Jean-Luc
通讯作者：
Montillet, Jean-Luc
影响因子：
3.3
作者：
Kieffer, Pol;Schroeder, Peter;Hausman, Jean-Francois
通讯作者：
Hausman, Jean-Francois