He Zaimei, Xiong Ji, Yu Xianghai, Wang Yi, Cheng Yiran, Zhou Yonghong, Kang Houyang, Zeng Jian
Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, 611130 Sichuan China.
College of Resources, Sichuan Agricultural University, Wenjiang, 611130 Sichuan China.
Physiol Mol Biol Plants. 2024 Nov;30(11):1841-1852. doi: 10.1007/s12298-024-01532-8. Epub 2024 Nov 28.
Soil cadmium (Cd) contamination in agriculture has intensified due to industrial development and human activities, which seriously affected the safety production in wheat. There are increasing evidences that rhizosphere bacteria contributed to alleviating Cd stress in plants, but the mechanism of how rhizosphere bacteria affecting the adaptive growth of wheat exposed to Cd contamination has not been extensively explored. Therefore, the rhizosphere bacterial community dynamics and plant growth for wheat were investigated under different levels of soil Cd contamination in accordance with risk control standard for soil contamination of agricultural land. The results showed that there was no significant difference in transport coefficient of Cd in wheat plants grown in different levels of soil Cd contamination conditions. Soil Cd contamination led to a decrease in soil pH value and an increase in exchangeable Cd content in rhizosphere soil. Although rhizosphere bacterial richness and diversity had no significant difference between soil Cd contamination conditions, as its community composition changed significantly. Under Cd contamination of risk screening value, Actinobacteria, Chloroflexi, and Nitrospira showed higher abundance, but Bacteroidetes, Patescibacteria, Sphingomonas, ADurbBin063-1 and Bryobacter were more prevalent under Cd contamination of risk intervention value. The enrichment of Patescibacteria, Proteobacteria and Acidobacteria was beneficial for Cd fixation, while Nitrospira enhanced nutrient uptake and utilization. Furthermore, Cd contamination with risk screening value enhanced the relationship among rhizosphere bacterial communities, and Cd contamination with risk intervention value increased the cooperative relationship among rhizosphere bacterial species. Additionally, soil Cd content showed a significantly positive correlation with Patescibacteria and ADurbBin063-1, and a significantly negative correlation with pH. Altogether, the shift in the community structures of rhizosphere bacterial was crucial for farmland protection and food safety in Cd polluted soil.
The online version contains supplementary material available at 10.1007/s12298-024-01532-8.
由于工业发展和人类活动，农业土壤镉（Cd）污染加剧，严重影响了小麦安全生产。越来越多的证据表明，根际细菌有助于缓解植物镉胁迫，但根际细菌如何影响受镉污染小麦的适应性生长的机制尚未得到广泛探索。因此，根据农用地土壤污染风险管控标准，研究了不同土壤镉污染水平下小麦根际细菌群落动态和植株生长情况。结果表明，在不同土壤镉污染水平条件下生长的小麦植株中，镉的转运系数没有显著差异。土壤镉污染导致土壤pH值下降，根际土壤中交换性镉含量增加。虽然根际细菌丰富度和多样性在土壤镉污染条件之间没有显著差异，但其群落组成发生了显著变化。在镉污染风险筛选值条件下，放线菌门、绿弯菌门和硝化螺旋菌门丰度较高，而在镉污染风险管控值条件下拟杆菌门、微枝形菌门、鞘氨醇单胞菌属、ADurbBin063 - 1和Bryobacter更为普遍。微枝形菌门、变形菌门和酸杆菌门的富集有利于镉的固定，而硝化螺旋菌门则增强了养分的吸收和利用。此外，镉污染风险筛选值增强了根际细菌群落之间的关系，镉污染风险管控值增加了根际细菌物种之间的协作关系。另外，土壤镉含量与微枝形菌门和ADurbBin063 - 1呈显著正相关，与pH呈显著负相关。总之，根际细菌群落结构的变化对镉污染土壤的农田保护和食品安全至关重要。
在线版本包含可在10.1007/s12298 - 024 - 01532 - 8获取的补充材料。
