Sex-related adaptive responses to interaction of drought and salinity in Populus yunnanensis
Sex-related adaptive responses to interaction of drought and salinity in Populus yunnanensis
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云南杨对干旱和盐度相互作用的性别相关适应性反应
DOI：
10.1111/j.1365-3040.2010.02182.x
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发表时间：
2010-10-01
影响因子：
7.3
通讯作者：
Li, Chunyang
中科院分区：
文献类型：
--
作者：
Chen, Lianghua;Zhang, Sheng;Li, Chunyang
我们用云南杨，作为模式植物研究干旱、盐碱及其复合胁迫下的形态、生理、生化和超微结构响应。在干旱、盐胁迫条件下，尤其是在盐胁迫和干旱胁迫条件下，雌性比雄性表现出更强的生长抑制、气体交换速率降低和活性氧（ROS）积累;更高的过氧化脂质水平、更低的渗透调节能力和抗坏血酸-谷胱甘肽循环酶活性;以及更多的细胞器损伤。此外，我们发现，在不同的渗透胁迫下，总叶绿素含量（TC），类胡萝卜素浓度和碳同位素组成的性别特异性反应。我们的研究结果表明：（1）在干旱、盐胁迫下，特别是在干旱、盐胁迫和盐胁迫复合胁迫下，雌性比雄性更敏感，遭受的负面影响更大;（2）对干旱、盐胁迫和盐胁迫复合胁迫的适应性反应的性别差异是环境相关的;（3）在复合胁迫下的性别特异性反应不同于单一胁迫反应。因此，这些结果提供了证据的性别之间的适应性分化，在响应渗透胁迫和对环境变化的敏感性。
We used Populus yunnanensis Dode., a native dioecious species in southwestern China, as a model species to study morphological, physiological, biochemical and ultrastructural responses to drought, salinity and their combination. Females exhibited more growth inhibition, gas exchange rate depression and reactive oxygen species (ROS) accumulation; higher lipid peroxide levels, lower osmotic adjustment capacity and ascorbate-glutathione cycle enzyme activities; and more damage to cell organelles than did males under drought, salinity and especially under their combination. In addition, we found sex-specific responses in total chlorophyll content (TC), carotenoid concentration and carbon isotope composition under different osmotic stresses. Our results indicated that: (1) females are more sensitive and suffer from greater negative effects than do males under drought, salinity and especially under their combination; (2) sexual differences in adaptive responses to drought, salinity and their combination are context dependent; and (3) sex-specific reactions under a combination of stresses are distinct from single-stress responses. Thus, these results provide evidence for adaptive differentiation between sexes in responses to osmotic stresses and in the sensitivity to environmental change.