Arbuscular mycorrhizal fungi (AMF) enhance the tolerance of Euonymus maackii Rupr. at a moderate level of salinity
Arbuscular mycorrhizal fungi (AMF) enhance the tolerance of Euonymus maackii Rupr. at a moderate level of salinity
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丛枝菌根真菌（AMF）增强大叶黄杨的耐受性。
DOI：
10.1371/journal.pone.0231497
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发表时间：
2020-04-14
期刊：
影响因子：
3.7
通讯作者：
Liu, Ting
中科院分区：
文献类型：
--
作者：
Li, Zhen;Wu, Na;Liu, Ting
盐胁迫是植物生长的主要环境限制因素之一。虽然菌根植物应对盐胁迫的方法已有较好的研究，但对于当地重要的生态修复树种金叶桉（Eurobustus maackii），接种丛枝菌根真菌（AMF）和盐胁迫的研究尚属空白。在本研究中，我们测试了不同盐水平（0，50，100，150和200 mM）和AMF接种对E. maackii生长速率、光合作用、抗氧化酶、养分吸收和盐离子分布。结果表明，盐胁迫对株高、光合能力、养分积累有负面影响，但盐胁迫促进了抗氧化防御系统和盐离子积累。盐离子过量积累引起的中毒症状随着盐浓度的增加而逐渐加重（50 mM NaCl处理除外）。AMF接种缓解了中等盐水平（100和150 mM）下的毒性症状，通过增加光合能力，加速营养吸收和激活抗氧化酶活性盐胁迫下。同时，在低浓度（0和50 mM）和高浓度（200 mM）的NaCl浓度下，AMF对幼苗没有检测到影响。本研究表明AMF对E.表明AMF-E具有潜在的应用价值。maackii关于盐生态系统的恢复。
Salt stress is one of the major environmental constraints for plant growth. Although the ways in which mycorrhizal plants deal with salt stress have been well documented, it still is blank for Euonymus maackii, an important local ecological restoration tree, to arbuscular mycorrhizal fungi (AMF) inoculation and salt stress. In this study, we tested the effect of different salt levels (0, 50, 100,150 and 200 mM) and AMF inoculation on E. maackii growth rate, photosynthesis, antioxidant enzymes, nutrient absorption and salt ion distribution. The results indicated negative effect of salt on height, photosynthesis capacity, nutrition accumulation, while salt stimulated the antioxidant defense system and salt ions accumulation. The toxic symptom by excessive accumulation of salt ions worsen with salt level increased gradually (except for the 50 mM NaCl treatment). AMF inoculation alleviated the toxic symptom under moderate salt levels (100 and 150 mM) by increasing photosynthesis capacity, accelerating nutrient absorption and activating antioxidant enzyme activities under salt stress. Meanwhile, effect of AMF was not detected on seedlings under slight (0 and 50 mM) and high (200 mM) NaCl concentration. Our study indicated AMF had positive impact on E. maackii subjected to salt, which suggested potential application of AMF- E. maackii on restoration of salt ecosystems.