Effects of fertilizer reduction coupled with straw returning on soil fertility, wheat root endophytic bacteria, and the occurrence of wheat crown rot

Frontiers in Microbiology

Microbiology

Caiyun Cao¹  Xuetong Liu¹  Yuxing Wu²  Sen Han²  Yajiao Wang²  Weisong Zhao²  Qiusheng Li²  Lingxiao Kong² 

[1] Institute of Dryland Farming, Hebei Academy of Agricultural and Forestry Sciences, Hengshui, China;Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Baoding, China;

关键词: excessive fertilization;    fertilizer reduction;    straw returning;    endophytic bacteria;    wheat crown rot;   

DOI  :  10.3389/fmicb.2023.1143480

 received in 2023-01-13, accepted in 2023-03-06,  发布年份 2023

来源: Frontiers

【 摘 要 】

Excessive fertilization is associated with nutrient loss, soil compaction, and weak plant resistance. Straw returning can increase soil fertility with a consequent reduction in fertilizer, but the effects of fertilizer reduction coupled with straw returning on crop endophytic microbes and crop disease are poorly understood. Therefore, using metagenomic sequencing methods we investigated the responses of soil fertility, diversity, the function of root endophytic bacteria, and the occurrence of wheat crown rot due to the application of fertilizer (no, moderate and excessive fertilizer) coupled with or without straw returning after 7 years of treatments. The results showed that, after excessive fertilization, the wheat crown rot became severe, registering a disease index of 23. Compared with excessive fertilization, moderate fertilization coupled with straw returning significantly reduced the incidence of wheat crown rot, the disease index was reduced by 38.50%, and the richness and diversity of endophytic bacteria were increased by 61.20 and 11.93%, respectively, but the soil fertility was not significantly affected. In addition, moderate fertilization coupled with straw returning changed the community structure of endophytic bacteria and increased the relative abundance of carbohydrate metabolism and nitrogen fixation-related genes by 4.72 and 9.32%, respectively. Our results indicated that fertilizer reduction coupled with straw returning reduced the occurrence of wheat crown rot, increased the diversity of endophytic bacteria, and changed the community structure and function of endophytic bacteria, which will provide a better understanding of the interaction of fertilization coupled with straw returning, endophytic bacteria and wheat crown rot.

【 授权许可】

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Copyright © 2023 Wang, Wu, Cao, Han, Zhao, Li, Liu and Kong.