Liu Xuesheng, Zeng Xing, Zhu Yuhang, Wang Wei, Huang Siqi, Qiao Xinxin, Wang Zhenhua, Di Hong, Qu Juanjuan
College of Resources and Environmental Science, Northeast Agricultural University, Harbin, China.
College of Agronomy, Northeast Agricultural University, Harbin, China.
Front Microbiol. 2023 Jun 6;14:1180310. doi: 10.3389/fmicb.2023.1180310. eCollection 2023.
The development of salt-alkali tolerant genetically modified crops represents an important approach to increase grain production in saline-alkali soils. However, there is a paucity of research on the impact of such genetically modified crops on soil microbial diversity. This study aims to investigate the straw degradation of betaine aldehyde dehydrogenase () transgenic maize BZ-136 and its effects on soil chemical properties, fungal community composition, community diversity and ecological function compared to non-transgenic maize Zheng58 straw. The degradation experiments of BZ-136 straw were carried out under a simulated burying condition with saline-alkali soil for 210 days. The results showed that the degradation rate of C and N of BZ-136 straw was significantly faster than that of Zheng58 in the early stage ( < 0.05). Compared to Zheng58, the straw degradation of BZ-136 increased the soil available nitrogen (AN), total phosphorus (TP), and available phosphorus (AP) in the early stage ( < 0.05). The AN content of soil with BZ-136 straw was 18.16 and 12.86% higher than that of soil with Zheng58 at day 60 and 120 ( 0.05). The TP content of soil with BZ-136 was higher 20.9 and 20.59% than that with Zheng58 at day 30 and 90 ( 0.05). The AP content of soil with BZ-136 was 53.44% higher than that with Zheng58 at day 60 ( 0.05). The straw degradation of BZ-136 increased the OTU number of soil fungal community by 127 ( 0.05) at day 60, and increased Chao1 and Shannon index at day 60 and 180 ( 0.05). The degradation rate of C and N in BZ-136 straw was higher than that in Zheng58 at early stage, which led to the phased increase of soil AN and TP contents, and the obvious changes of relative abundances (RA) of some genera and guilds. These findings are important as they provide insight into the potential benefits of transgenic crops in upgrading the soil fertility and the fungal community diversity.
耐盐碱转基因作物的培育是提高盐碱地粮食产量的重要途径。然而，关于此类转基因作物对土壤微生物多样性影响的研究较少。本研究旨在探究甜菜碱醛脱氢酶（）转基因玉米BZ - 136的秸秆降解情况，以及与非转基因玉米郑58秸秆相比，其对土壤化学性质、真菌群落组成、群落多样性和生态功能的影响。BZ - 136秸秆的降解实验在模拟盐碱土掩埋条件下进行210天。结果表明，BZ - 136秸秆在早期的碳、氮降解速率显著快于郑58（<0.05）。与郑58相比，BZ - 136秸秆降解在早期增加了土壤有效氮（AN）、总磷（TP）和有效磷（AP）含量（<0.05）。在第60天和120天，含BZ - 136秸秆土壤的AN含量分别比含郑58秸秆的土壤高18.16%和12.86%（0.05）。在第30天和90天，含BZ - 136秸秆土壤的TP含量分别比含郑58秸秆的土壤高20.9%和20.59%（0.05）。在第60天，含BZ - 136秸秆土壤的AP含量比含郑58秸秆的土壤高53.44%（0.05）。在第60天，BZ - 136秸秆降解使土壤真菌群落的OTU数量增加了127个（<0.05），并在第60天和180天增加了Chao1和Shannon指数（<0.05）。BZ - 136秸秆在早期的碳、氮降解速率高于郑58，导致土壤AN和TP含量阶段性增加，以及一些属和功能组的相对丰度（RA）明显变化。这些发现很重要，因为它们为转基因作物在提升土壤肥力和真菌群落多样性方面的潜在益处提供了见解。
