TY - JOUR T1 - Liquid Organic Fertilizer Amendment Alters Rhizosphere Microbial Community Structure and Co-occurrence Patterns and Improves Sunflower Yield Under Salinity-Alkalinity Stress. AU - Li,Haiyang, AU - Luo,Nanyan, AU - Ji,Chenglong, AU - Li,Jin, AU - Zhang,Lan, AU - Xiao,Li, AU - She,Xiaolin, AU - Liu,Zhe, AU - Li,Yulong, AU - Liu,Cunshou, AU - Guo,Qiao, AU - Lai,Hangxian, Y1 - 2021/09/18/ PY - 2021/06/02/received PY - 2021/09/10/accepted PY - 2021/9/19/pubmed PY - 2022/9/8/medline PY - 2021/9/18/entrez KW - Co-occurrence network KW - Fungal diversity KW - Organic fertilizer KW - Rhizosphere microorganisms KW - Saline-alkaline soils KW - Sunflower SP - 423 EP - 438 JF - Microbial ecology JO - Microb Ecol VL - 84 IS - 2 N2 - Response of rhizosphere microbial community structure and co-occurrence patterns to liquid organic fertilizer in sunflower cropland was investigated. Moderate and severe saline-alkaline soils were treated with liquid organic fertilizer containing mainly small molecular organic compounds (450 g L-1) at a rate of 4500 L ha-1 year-1 over 2 years. Compared with the untreated soils, organic fertilizer treatment increased soil nutrient concentrations by 13.8-137.1% while reducing soil pH and salinity by 5.6% and 54.7%, respectively. Organic fertilizer treatment also improved sunflower yield, plant number, and plant height by 28.6-67.3%. Following organic fertilizer treatment, fungal α-diversity was increased, and the effects of salinity-alkalinity stress on rhizosphere microbial communities were alleviated. The relative abundances of some halotolerant microbes and phytopathogenic fungi were reduced in organic fertilizer-treated soils, in contrast to increases in the relative abundances of plant growth-promoting microbes and organic matter decomposers, such as Nocardioides, Rhizophagus, and Stachybotrys. Network analysis revealed that severe salinity-alkalinity stress stimulated cooperation among bacteria, while organic fertilizer treatment tended to stimulate the ecosystem functions of fungi with higher proportions of fungi-bacteria and fungi-fungi links. More keystone taxa (e.g., Amycolatopsis, Variovorax, and Gemmatimonas) were positively correlated with soil nutrient concentrations and crop yield-related traits in organic fertilizer-treated soils. Overall, liquid organic fertilizer amendment could attenuate the adverse effects of salinity-alkalinity stress on sunflower yield by improving soil quality and optimizing rhizosphere microbial community structure and co-occurrence patterns. SN - 1432-184X UR - https://www.unboundmedicine.com/medline/citation/34535834/Liquid_Organic_Fertilizer_Amendment_Alters_Rhizosphere_Microbial_Community_Structure_and_Co_occurrence_Patterns_and_Improves_Sunflower_Yield_Under_Salinity_Alkalinity_Stress_ DB - PRIME DP - Unbound Medicine ER -