Begum Nahmina, Hu Zhaoyang, Cai Qingsheng, Lou Laiqing
College of Life Sciences, Nanjing Agricultural University, Jiangsu 210095, China.
Plants (Basel). 2019 Nov 14;8(11):504. doi: 10.3390/plants8110504.
This study aimed to evaluate the gene expression of and in the switchgrass inoculated with plant-growth-promoting-bacteria (PGPB) under cadmium (Cd) stress and to observe the benefit of PGPB in plant growth and development. Plants were grown in hydroponic culture and treated with PGPB inoculants: and with the strains Bc09, So23, E02, and Oj24, respectively. The experimental results revealed that and genes expressed highly in the PGPB-inoculated plants under Cd stress. In addition, the expression of and genes was considerably higher in the first two days after successive four-day exposure of Cd in plants compared to the last two days of exposure. Increased biomass and indole-3-acetic-acid production with reduced Cd accumulation were observed in the PGPB-inoculated plants under Cd stress compared to the Cd-control plants. These PGPB, with their beneficial mechanisms, protect plants by modifying the gene expression profile that arises during Cd-toxic conditions and increased the healthy biomass of switchgrass. This demonstrates there is a correlation among the growth parameters under Cd stress. The PGPB in this study may help to intensify agriculture by triggering mechanisms to encourage plant growth and development under heavy metal stress.
本研究旨在评估镉（Cd）胁迫下接种促植物生长细菌（PGPB）的柳枝稷中[具体基因名称缺失]和[具体基因名称缺失]的基因表达，并观察PGPB对植物生长发育的益处。植物采用水培法种植，并用PGPB接种剂处理：[具体植物名称缺失]和[具体植物名称缺失]分别接种菌株Bc09、So23、E02和Oj24。实验结果表明，在Cd胁迫下，接种PGPB的植物中[具体基因名称缺失]和[具体基因名称缺失]基因高表达。此外，与连续四天暴露于Cd的最后两天相比，植物在连续四天暴露于Cd后的前两天中，[具体基因名称缺失]和[具体基因名称缺失]基因的表达明显更高。与Cd对照植物相比，在Cd胁迫下接种PGPB的植物中观察到生物量增加、吲哚 - 3 - 乙酸产量增加且Cd积累减少。这些PGPB通过其有益机制，通过改变Cd毒性条件下出现的基因表达谱来保护植物，并增加了柳枝稷的健康生物量。这表明在Cd胁迫下生长参数之间存在相关性。本研究中的PGPB可能通过触发机制来促进重金属胁迫下的植物生长发育，从而有助于强化农业生产。
