Ma Jiawei, Rukh Gul, Ye Zhengqian, Xie Xiaocui, Ruan Zhongqiang, Liu Dan
Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Hangzhou 311300, China.
The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China.
Toxics. 2022 May 27;10(6):290. doi: 10.3390/toxics10060290.
Hypoxic environments have an adverse effect on the growth and development of , and this is accompanied by the production of reducing substances such as Fe and Mn. In this study, the effect of hypoxic stress and Mn concentrations on leaf chlorophyll contents, root morphology, root activity, element absorption, antioxidant enzymes, and respiratory enzyme system of were evaluated in a hydroponics environment. The results revealed that application of Mn during hypoxic stress enhanced leaf chlorophyll contents and boosted up the indexes of the root system. The root activity of was reduced with stresses of hypoxia. The treatment of Mn initially improved and then decreased the root activity of , and attained its maximum with application of 300 μmol/L Mn compared with control. The indexes of antioxidant enzymes of were higher than that of 8 mg/L oxygen concentrations except for variable superoxide dismutase (SOD) in the treatment of 300 μmol/L Mn with hypoxia stress. The application of Mn had inhibited the absorption of mineral elements in . The activities of pyruvate decarboxylase (PDC), alcohol dehydrogenase (ADH), and lactic dehydrogenase (LDH) were initially improved and then diminished with hypoxia stress. It is concluded that hypoxia is a key factor affecting the growth and degradation of , while combining it with the increase of Mn concentration enhances the damage to . Our research is helpful for the sustainable management and scientific fertilization management of .
缺氧环境对[具体对象]的生长发育有不利影响，并且伴随着铁和锰等还原性物质的产生。在本研究中，在水培环境下评估了缺氧胁迫和锰浓度对[具体对象]的叶片叶绿素含量、根系形态、根系活力、元素吸收、抗氧化酶和呼吸酶系统的影响。结果表明，在缺氧胁迫期间施用锰可提高叶片叶绿素含量并提升根系指标。[具体对象]的根系活力在缺氧胁迫下降低。锰处理最初提高了[具体对象]的根系活力，随后又使其降低，与对照相比，在施用300 μmol/L锰时达到最大值。除了在缺氧胁迫下300 μmol/L锰处理中的可变超氧化物歧化酶（SOD）外，[具体对象]的抗氧化酶指标高于8 mg/L氧气浓度处理的。锰的施用抑制了[具体对象]对矿质元素的吸收。丙酮酸脱羧酶（PDC）、乙醇脱氢酶（ADH）和乳酸脱氢酶（LDH）的活性在缺氧胁迫下最初提高，随后降低。得出的结论是，缺氧是影响[具体对象]生长和退化的关键因素，而将其与锰浓度的增加相结合会增强对[具体对象]的损害。我们的研究有助于[具体对象]的可持续管理和科学施肥管理。
