State Key Laboratory of Food Science and Technology, School of Environment and Civil Engineering, Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi 214122, China; Jiangsu Cooperative Innovation Center of Water Treatment Technology and Materials, Suzhou University of Science and Technology, Suzhou 212003, China.
State Key Laboratory of Food Science and Technology, School of Environment and Civil Engineering, Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi 214122, China; Jiangsu Cooperative Innovation Center of Water Treatment Technology and Materials, Suzhou University of Science and Technology, Suzhou 212003, China.
Ecotoxicol Environ Saf. 2017 Nov;145:150-160. doi: 10.1016/j.ecoenv.2017.07.028. Epub 2017 Aug 30.
Bisphenol A (BPA) is an emerging environmental endocrine disruptor that has toxic effects on plants growth. Photosynthesis supplies the substances and energy required for plant growth, and regulated by stomatal and non-stomatal factors. Therefore, in this study, to reveal how BPA affects photosynthesis in soybean seedlings (Glycine max L.) from the perspective of stomatal and non-stomatal factors, the stomatal factors (stomatal conductance and behaviours) and non-stomatal factors (Hill reaction, apparent quantum efficiency, Rubisco activity, carboxylation efficiency, the maximum Rubisco carboxylation velocity, ribulose-1,5-bisphospate regeneration capacities mediated by maximum electron transport rates, and triose phosphate utilization rate) were investigated using a portable photosynthesis system. Moreover, the pollution of BPA in the environment was simulated. The results indicate that low-dose BPA enhanced net photosynthetic rate (P) primarily by promoting stomatal factors, resulting in increased relative growth rates and accelerated soybean seedling growth. High-dose BPA decreases the P by simultaneously inhibiting stomatal and non-stomatal factors, and this inhibition decreases the relative growth rates further reducing soybean seedling growth. Following the withdrawal of BPA, all of the indices were restored to varying degrees. In conclusion, low-dose BPA increased the P by promoting stomatal factors while high-dose BPA decreased the P by simultaneously inhibiting stomatal and non-stomatal factors. These findings provide a model (or, hypothesis) for the effects of BPA on plant photosynthesis.
双酚 A（BPA）是一种新兴的环境内分泌干扰物，对植物生长具有毒性作用。光合作用为植物生长提供所需的物质和能量，并受到气孔和非气孔因素的调节。因此，在这项研究中，为了从气孔和非气孔因素的角度揭示 BPA 如何影响大豆幼苗（Glycine max L.）的光合作用，使用便携式光合作用系统研究了气孔因素（气孔导度和行为）和非气孔因素（希尔反应、表观量子效率、Rubisco 活性、羧化效率、最大 Rubisco 羧化速度、最大电子传递速率介导的 1,5-二磷酸核酮糖再生能力以及三磷酸甘油醛利用速率）。此外，模拟了 BPA 在环境中的污染。结果表明，低剂量 BPA 主要通过促进气孔因素来增强净光合速率（P），从而导致相对生长率增加，加速大豆幼苗生长。高剂量 BPA 通过同时抑制气孔和非气孔因素降低 P，这种抑制作用进一步降低相对生长率，从而减少大豆幼苗生长。BPA 去除后，所有指标均在不同程度上得到恢复。总之，低剂量 BPA 通过促进气孔因素增加 P，而高剂量 BPA 通过同时抑制气孔和非气孔因素降低 P。这些发现为 BPA 对植物光合作用的影响提供了一个模型（或假设）。
