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首页> 外文期刊>Nitrogen >Oxidative Stress Produced by Paraquat Reduces Nitrogen Fixation in Soybean- Bradyrhizobium diazoefficiens Symbiosis by Decreasing Nodule Functionality
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Oxidative Stress Produced by Paraquat Reduces Nitrogen Fixation in Soybean- Bradyrhizobium diazoefficiens Symbiosis by Decreasing Nodule Functionality

机译：通过减少结节功能，通过帕拉采集产生的氧化胁迫降低了大豆 - Bradyrozobium diazoeficiens共生中的氮固定

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摘要

Soybean (Glycine max.) is one of the most important legumes cultivated worldwide. Its productivity can be altered by some biotic and abiotic stresses like global warming, soil metal pollution or over-application of herbicides like paraquat (1,1’-dimethyl-4,4’-bipyridinium dichloride). In this study, the effect of oxidative stress produced by paraquat addition (0, 20, 50 and 100 μM) during plant growth on symbiotic nitrogen fixation (SNF) and functionality of Bradyrhizobium diazoefficiens-elicited soybean nodules were evaluated. Results showed that the 50 μM was the threshold that B. diazoefficiens can tolerate under free-living conditions. In symbiosis with soybean, the paraquat addition statistically reduced the shoot and root dry weight of soybean plants, and number and development of the nodules. SNF was negatively affected by paraquat, which reduced total nitrogen content and fixed nitrogen close to 50% when 100 μM was added. These effects were due to the impairment of nodule functionality and the increased oxidative status of the nodules, as revealed by the lower leghaemoglobin content and the higher lipid peroxidation in soybean nodules from paraquat-treated plants.
机译：大豆（甘氨酸最大）是全球培育的最重要的豆类之一。它的生产率可以通过一些生物和非生物胁迫改变，如全球变暖，土壤金属污染或超施用除草剂（如百草枯（1,1'-二甲基-4,4'-双氯化吡啶））。在该研究中，评估了在植物生长期间通过百草枯加成（0,20,50和100μm）产生的氧化应激对共生氮固定（SNF）和BradyrhizobiumIdoficiciens引发大豆结节的官能度的影响。结果表明，50μm是B. diazoeffiens在自由生活条件下耐受的阈值。在Syobiean中的共生中，百草枯添加统计上减少了大豆植物的芽和根系干重，以及结节的数量和发育。 SNF受百草枯对100μm加入100μm时减少总氮含量和固定氮气的百草含量。这些效果是由于结节官能度的损害以及结节的氧化状态增加，如下leghaemoglobin含量和大豆结节中的脂质过氧化的较高脂质过氧化植物所揭示。

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