Fankhauser H, Brunold Chr, Erismann K H
Pflanzenphysiologisches Institut der Universität Bern, Altenbergrain 21, CH-3013, Bern, Switzerland.
Oecologia. 1976 Sep;23(3):201-209. doi: 10.1007/BF00361236.
There was no disturbance in the growth of Lemna minor L. with a SO concentration of up to 0.3 ppm in air. A SO concentration of 0.6 ppm caused an initial depression of the growth rate of about 25%, but in the course of adaptation, the rate rose to the values of the control. The average dry weight per frond was not influenced by the SO fumigation. The initial sporadic appearance of chloroses by fumigation with 0.6 ppm SO was considered a sign of the proximate toxicity limit for Lemna minor L. With 0.15 ppm SO in air, the size of the fronds was reduced. The average surface of the fronds was diminished by 0.3 ppm SO for about 16% as compared with the control plants.The protein remained quantitatively uneffected up to a SO concentration of 0.6 ppm. As a qualitative influence of SO, the nitrogen content of the proteins remained constant, but the sulfur content of the proteins increased.Under 0.3 and 0.6 ppm SO, the starch content decreased immediately by 20-30%, under 0.15 ppm SO the decrease reached the same level after a longer time than in the case of the higher concentrations.The SO concentrations up to 0.6 ppm had no effect on chlorophyll concentration.The contents of C, N, H, P, K, Na, Ca, Mg, Mn, and Fe were not effected by SO fumigation.
SO may have some effects on product yield, even under low concentrations, without provoking acute damage; the plant is able to adapt by regulation of its metabolism, and enters a new steady state.
空气中二氧化硫浓度高达0.3 ppm时，小浮萍（Lemna minor L.）的生长未受干扰。二氧化硫浓度为0.6 ppm时，生长速率最初下降约25%，但在适应过程中，生长速率回升至对照值。每片叶状体的平均干重不受二氧化硫熏蒸影响。用0.6 ppm二氧化硫熏蒸最初偶尔出现的褪绿现象被认为是小浮萍接近毒性极限的标志。空气中二氧化硫浓度为0.15 ppm时，叶状体大小减小。与对照植物相比，0.3 ppm二氧化硫使叶状体的平均表面积减少约16%。二氧化硫浓度达0.6 ppm时，蛋白质含量在数量上未受影响。作为二氧化硫的定性影响，蛋白质中的氮含量保持不变，但蛋白质中的硫含量增加。在0.3和0.6 ppm二氧化硫条件下，淀粉含量立即下降20 - 30%，在0.15 ppm二氧化硫条件下，淀粉含量下降到相同水平所需时间比高浓度时更长。二氧化硫浓度达0.6 ppm时对叶绿素浓度无影响。碳、氮、氢、磷、钾、钠、钙、镁、锰和铁的含量不受二氧化硫熏蒸影响。
即使在低浓度下，二氧化硫可能对产物产量有一些影响，但不会引发急性损害；植物能够通过调节其新陈代谢来适应，并进入新的稳定状态。
