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首页> 外文期刊>Journal of Plant Physiology >Sequential effects of acidic precipitation and drought on photosynthesis and chlorophyll fluorescence parameters of Pinus radiata D. Don seedlings.
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Sequential effects of acidic precipitation and drought on photosynthesis and chlorophyll fluorescence parameters of Pinus radiata D. Don seedlings.

机译：酸性降水和干旱对辐射松（D. Don）幼苗光合作用和叶绿素荧光参数的顺序影响。

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The sequential effect of simulated acid rain (SAR) and water stress on net photosynthesis (A), internal CO2 concentration (Ci), stomatal conductance (g), and instantaneous water use efficiency (A/E) of Pinus radiata, and the photochemical damage caused by these stressors were studied by analysing chlorophyll fluorescence parameters such as Fv/Fm, Fv/Fo and Fm/Fo. SAR caused inhibition of photosynthesis. The depletion of CO2 assimilation seems not to be solely a stomatal effect as effects on chloroplasts contribute to this photosynthetic inhibition. No noticeable damage seemed to occur to the photochemical apparatus since well-watered plants treated with acid rain did not show any change in the chlorophyll fluorescence. Water stress produced a large effect on both gas exchange and chlorophyll fluorescence parameters, indicating structural and functional damage. Interactions among SAR and drought had a larger impact on all parameters studied. However, after rewatering, significant recovery in bothgas exchange and chlorophyll fluorescence parameters occurred within 6 days, although the values measured prior to the imposition of treatments were not recovered. It was concluded that P. radiata exposed to acid rain were affected in a wide range of components in the photosynthetic apparatus, thereby modifying its response to sequential drought stress.
机译：模拟酸雨（SAR）和水分胁迫对辐射松净光合作用（A），内部CO2浓度（Ci），气孔导度（g）和瞬时水分利用效率（A / E）以及光化学物质的顺序影响通过分析叶绿素荧光参数，例如Fv / Fm，Fv / Fo和Fm / Fo，研究了由这些应激源引起的伤害。 SAR抑制了光合作用。由于对叶绿体的影响有助于这种光合作用的抑制，CO2同化的消耗似乎不只是气孔效应。由于用酸雨处理的水分充足的植物并未显示出叶绿素荧光的任何变化，因此光化学设备似乎没有出现明显的损坏。水分胁迫对气体交换和叶绿素荧光参数均产生很大影响，表明结构和功能受损。 SAR和干旱之间的相互作用对所研究的所有参数影响更大。然而，重新浇水后，尽管没有恢复处理前的测量值，但在6天之内气体交换和叶绿素荧光参数均出现了显着恢复。结论是，暴露于酸雨中的辐射松受到光合作用设备中多种成分的影响，从而改变了其对连续干旱胁迫的响应。

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