$\mathrm{Mn}_{3} \mathrm{O}_{4}$ 纳米酶改善拟南芥盐胁迫耐受的研究

为了探究$\mathrm{Mn}_3\mathrm{O}_4$ 纳米酶对改善盐胁迫下拟南芥的耐受作用，文章通过水热法合成 $\mathrm{Mn}_3\mathrm{O}_4$ 纳米酶，采用透射电子显微镜(transmission electron microscopy, TEM)对 $\mathrm{Mn}_3\mathrm{O}_4$ 纳米酶的形貌进行表征，测定 $\mathrm{Mn}_3\mathrm{O}_4$ 纳米酶活性，并进一步研究 $\mathrm{Mn}_3\mathrm{O}_4$ 纳米酶在盐胁迫下对拟南芥生长及光合作用的影响。结果表明：合成的 $\mathrm{Mn}_3\mathrm{O}_4$ 纳米酶尺寸为 $10\mathrm{nm}$ 左右； $\mathrm{Mn}_3\mathrm{O}_4$ 纳米酶对 $\mathrm{H}_2\mathrm{O}_2$ 、羟基自由基（·OH)及超氧阴离子自由基（· $\mathrm{O}_2^-$ )等多种活性氧(reactive oxygen species, ROS)具有清除能力；施加 $\mathrm{Mn}_3\mathrm{O}_4$ 纳米酶可以改善盐胁迫对拟南芥生长的抑制作用及光合作用。研究结果可为解决盐胁迫下抑制植物的生长提供一种解决方案。

In order to investigate the role of$\mathrm{Mn}_3\mathrm{O}_4$ nanozymes in improving the tolerance of Arabidopsis thaliana (A. thaliana) under salt stress, this paper synthesized $\mathrm{Mn}_3\mathrm{O}_4$ nanozymes by hydrothermal method, and utilized transmission electron microscopy (TEM) to characterize the morphology of $\mathrm{Mn}_3\mathrm{O}_4$ nanozymes. The activity of $\mathrm{Mn}_3\mathrm{O}_4$ nanozymes was measured, and the effect of $\mathrm{Mn}_3\mathrm{O}_4$ nanozymes on the growth and photosynthesis of A. thaliana under salt stress was further investigated. The results showed that the synthesized $\mathrm{Mn}_3\mathrm{O}_4$ nanozymes had a size of about $10\mathrm{nm}$ ; $\mathrm{Mn}_3\mathrm{O}_4$ nanozymes had the scavenging ability for various reactive oxygen species (ROS) such as $\mathrm{H}_2\mathrm{O}_2$ , hydroxyl radicals ( $\cdot$ OH), and superoxide anion ( $\cdot$ O $_2^-$ ); the growth and photosynthesis of A. thaliana under salt stress were improved by applying $\mathrm{Mn}_3\mathrm{O}_4$ nanozymes. The results of the study may provide a solution to address the growth of plants under salt stress.