Cao Qing, Steinman Alan D, Yao Lei, Xie Liqiang
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Annis Water Resources Institute, Grand Valley State University, 740 West Shoreline Drive, Muskegon, MI 49441, USA.
Ecotoxicol Environ Saf. 2017 Nov;145:431-435. doi: 10.1016/j.ecoenv.2017.07.066. Epub 2017 Aug 2.
We conducted an indoor culture experiment to evaluate the phytotoxic effect of microcystins (MCs) on rice. After a 30day exposure, MCs induced a clear inhibition in rice growth, as well as a disruption of its antioxidant system and lipid peroxidation. We observed an increase in root membrane permeability; the conductivity of the leakage solution of the roots at 50 and 500μgL was significantly increased by 77% and 136%, respectively, compared to the control. Uptake of microelements (Fe, Mn, Cu and Zn) was generally not affected after the 30day exposure to MCs. In contrast, uptake of macroelements, with the exception of K, was stimulated by MCs. Ca content in roots exposed to 500μgL showed the greatest increase, by 47%, compared to the control. We propose the following mechanisms to explain our experimental results: exposure of rice roots to MCs leads to root damage and loss of membrane integrity, resulting in greater permeability and uptake of elements.
我们进行了一项室内培养实验，以评估微囊藻毒素（MCs）对水稻的植物毒性作用。经过30天的暴露，MCs对水稻生长产生了明显的抑制作用，同时破坏了其抗氧化系统并引发脂质过氧化。我们观察到根膜通透性增加；与对照相比，在50和500μg/L时根渗漏液的电导率分别显著增加了77%和136%。在暴露于MCs 30天后，微量元素（铁、锰、铜和锌）的吸收通常不受影响。相比之下，除钾之外的大量元素的吸收受到MCs的刺激。暴露于500μg/L的根中钙含量增加最多，与对照相比增加了47%。我们提出以下机制来解释我们的实验结果：水稻根暴露于MCs会导致根损伤和膜完整性丧失，从而导致更大的通透性和元素吸收。
