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首页> 外文期刊>Applied Microbiology >Field Evaluation of Arbuscular Mycorrhizal Fungal Colonization in Bacillus thuringiensis Toxin-Expressing (Bt) and Non-Bt Maize
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Field Evaluation of Arbuscular Mycorrhizal Fungal Colonization in Bacillus thuringiensis Toxin-Expressing (Bt) and Non-Bt Maize

机译：苏云金芽孢杆菌表达毒素（Bt）和非Bt玉米的丛枝菌根真菌定殖研究

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The cultivation of genetically engineered Bacillus thuringiensis toxin-expressing (Bt) maize continues to increase worldwide, yet the effects of Bt crops on arbuscular mycorrhizal fungi (AMF) in soil are poorly understood. In this field experiment, we investigated the impact of seven different genotypes of Bt maize and five corresponding non-Bt parental cultivars on AMF and evaluated plant growth responses at three different physiological time points. Plants were harvested 60 days (active growth), 90 days (tasseling and starting to produce ears), and 130 days (maturity) after sowing, and data on plant growth responses and percent AMF colonization of roots at each harvest were collected. Spore abundance and diversity were also evaluated at the beginning and end of the field season to determine whether the cultivation of Bt maize had a negative effect on AMF propagules in the soil. Plant growth and AMF colonization did not differ between Bt and non-Bt maize at any harvest period, but AMF colonization was positively correlated with leaf chlorophyll content at the 130-day harvest. Cultivation of Bt maize had no effect on spore abundance and diversity in Bt versus non-Bt plots over one field season. Plot had the most significant effect on total spore counts, indicating spatial heterogeneity in the field. Although previous greenhouse studies demonstrated that AMF colonization was lower in some Bt maize lines, our field study did not yield the same results, suggesting that the cultivation of Bt maize may not have an impact on AMF in the soil ecosystem under field conditions.
机译：全球范围内，基因工程苏云金芽孢杆菌表达毒素（Bt）的玉米的种植继续增加，但是人们对Bt作物对土壤中丛枝菌根真菌（AMF）的影响知之甚少。在该田间试验中，我们调查了7种不同基因型的Bt玉米和5种相应的非Bt亲本品种对AMF的影响，并评估了三个不同生理时间点的植物生长反应。播种后60天（活跃生长），90天（抽穗并开始产生穗）和130天（成熟）收获植物，并收集每次收获时植物生长反应和根部AMF定植百分比的数据。在田间季节开始和结束时还评估了孢子的丰度和多样性，以确定Bt玉米的种植是否对土壤中的AMF繁殖产生了负面影响。在任何收获时期，Bt和非Bt玉米的植物生长和AMF定植都没有差异，但是在130天收获时，AMF定植与叶绿素含量呈正相关。在一个田间季节中，种植Bt玉米对Bt与非Bt地块的孢子丰度和多样性没有影响。该图对总孢子数影响最大，表明田间空间异质性。尽管以前的温室研究表明，某些Bt玉米品系的AMF定植率较低，但我们的田间研究并未得出相同的结果，这表明Bt玉米的种植在田间条件下可能不会对土壤生态系统中的AMF产生影响。

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