Effects of arbuscular mycorrhizal inoculation on the growth, photosynthesis and antioxidant enzymatic activity of Euonymus maackii Rupr. under gradient water deficit levels.
Effects of arbuscular mycorrhizal inoculation on the growth, photosynthesis and antioxidant enzymatic activity of Euonymus maackii Rupr. under gradient water deficit levels.
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接种丛枝菌根对大叶黄杨生长、光合作用及抗氧化酶活性的影响。
DOI：
10.1371/journal.pone.0259959
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发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
Wu F
中科院分区：
文献类型：
--
作者：
Wu N;Li Z;Meng S;Wu F
丛枝菌根 (AM) 真菌（根内根瘤菌）在改善水亏缺介导的对大叶黄杨生长、光合作用和抗氧化系统的负面影响中的作用。被检查了。 E. maackii 幼苗经历 5 个水分亏缺水平，土壤含水量 20%、40%、60%、80% 和 100% 田间持水量 (FC)，以及 2 次接种处理，有或没有 AM 接种。随着水分亏缺程度的增加，水分亏缺逐渐限制了幼苗高度、地上部和根部的生物量积累、叶绿素含量、气体交换和叶绿素荧光参数。此外，除20% FC条件外，缺水刺激了芽和根中抗氧化酶的活性，包括超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT）。所有水分亏缺条件下的E. maackii幼苗均与AM真菌形成良好的共生关系，显着改善了干旱介导的负面影响，特别是在40%和60% FC条件下。在 40% 至 80% FC 条件下，AM 的形成通过显着提高生物量积累、叶绿素含量和同化来改善幼苗生长和光合作用。菌根幼苗对水分亏缺表现出更好的耐受性和更低的敏感性，这反映在40%和60% FC条件下芽和根的SOD活性较低以及芽的CAT活性较低。菌根幼苗中抗氧化系统的下调表明可以更好地维持氧化还原稳态并保护新陈代谢，包括生物量积累和同化。所有结果都表明，在 E. maackii 中接种 R. inradices 对对抗水分亏缺具有积极作用，尤其是在 40% FC 下，这表明 AM 在耐旱方面的独特表现以及 E. maackii-AM 真菌组合在干旱地区生态恢复中的潜在作用。
The role of arbuscular mycorrhizal (AM) fungus (Rhizophagus intraradices) in the amelioration of the water deficit-mediated negative influence on the growth, photosynthesis, and antioxidant system in Euonymus maackii Rupr. was examined. E. maackii seedlings were subjected to 5 water deficit levels, soil water contents of 20%, 40%, 60%, 80% and 100% field capacity (FC), and 2 inoculation treatments, with and without AM inoculation. The water deficit increasingly limited the seedling height, biomass accumulation in shoots and roots, chlorophyll content, gas exchange and chlorophyll fluorescence parameters with an increasing water deficit level. In addition, water deficit stimulated the activities of antioxidant enzymes, including superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), in both shoots and roots, except under 20% FC conditions. E. maackii seedlings under all water deficit conditions formed symbiosis well with AM fungi, which significantly ameliorated the drought-mediated negative effect, especially under 40% and 60% FC conditions. Under 40% to 80% FC conditions, AM formation improved seedling growth and photosynthesis by significantly enhancing the biomass accumulation, chlorophyll content and assimilation. Mycorrhizal seedlings showed better tolerance and less sensitivity to a water deficit, reflected in the lower SOD activities of shoots and roots and CAT activity of shoots under 40% and 60% FC conditions. Downregulation of the antioxidant system in mycorrhizal seedlings suggested better maintenance of redox homeostasis and protection of metabolism, including biomass accumulation and assimilation. All the results advocated the positive role of R. intraradices inoculation in E. maackii against a water deficit, especially under 40% FC, which suggested the distinct AM performance in drought tolerance and the potential role of the combination of E. maackii-AM fungi in ecological restoration in arid regions.
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