Department of Applied Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 16521, Prague, Czech Republic.
Department of Applied Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 16521, Prague, Czech Republic.
Environ Res. 2020 Dec;191:110203. doi: 10.1016/j.envres.2020.110203. Epub 2020 Sep 16.
Arbuscular mycorrhizal fungi (AMF) provide a positive effect on antioxidant mechanisms in terrestrial plants under heavy metal stress. This study investigated the effects of AMF on wetland plant (Iris wilsonii) growth and antioxidant response under Cr stress at different water depths. Results showed that AMF inoculated I. wilsonii had higher antioxidant response than non-inoculated controls, with shoot superoxide dismutase (SOD), root SOD, shoot peroxidase (POD), and root POD contents increased by 4.7-39.6%, 7.5-29.5%, 11.2-68.6%, 16.8-50.3%, respectively. Meanwhile, shoot (root) proline, malondialdehyde (MDA) and superoxide anion (O) contents in the AMF inoculated I. wilsonii were 10.2-44.3% (2.8-37.2%), 11.5-35.4% (16.9-28.2), and 14.9-30.5% (-0.9-26.3%) lower than those in the non-inoculated controls, respectively. Besides, AMF improved the growth of I. wilsonii with biomass, height, chlorophyll, K, and P contents in the shoots increased by 10.5-32.5%, 17.4-44.9%, 4.7-37.7%, 12.0-30.7%, 13.5-20.6%, respectively. Moreover, the I. wilsonii tolerance to Cr stress was also enhanced under the water depth of 6-3 cm. Therefore, AMF play an important role in wetland plant growth and antioxidant response under Cr stress, and it can improve wetland plants' tolerance to Cr stress at fluctuating water depth.
丛枝菌根真菌 (AMF) 在重金属胁迫下对陆生植物的抗氧化机制有积极影响。本研究调查了 AMF 对不同水深下湿地植物（鸢尾）生长和抗氧化响应的影响。结果表明，与未接种对照相比，接种 AMF 的鸢尾具有更高的抗氧化响应，其叶片超氧化物歧化酶 (SOD)、根 SOD、叶片过氧化物酶 (POD) 和根 POD 含量分别增加了 4.7-39.6%、7.5-29.5%、11.2-68.6%和 16.8-50.3%。同时，接种 AMF 的鸢尾叶片（根）脯氨酸、丙二醛（MDA）和超氧阴离子（O）含量分别比未接种对照低 10.2-44.3%（2.8-37.2%）、11.5-35.4%（16.9-28.2%）和 14.9-30.5%（-0.9-26.3%）。此外，AMF 还改善了鸢尾的生长，其地上部生物量、株高、叶绿素、K 和 P 含量分别增加了 10.5-32.5%、17.4-44.9%、4.7-37.7%、12.0-30.7%和 13.5-20.6%。此外，在水深为 6-3 厘米时，鸢尾对 Cr 胁迫的耐受性也得到了增强。因此，AMF 在 Cr 胁迫下湿地植物的生长和抗氧化响应中发挥着重要作用，并且可以提高湿地植物在波动水深下对 Cr 胁迫的耐受性。
