Root Exudates Promoted Microbial Diversity in the Sugar Beet Rhizosphere for Organic Nitrogen Mineralization

Dali Liu, Lingqing Xu, Hao Wang, Wang Xing, Baiquan Song and Qiuhong Wang ()
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Dali Liu: Key Laboratory of Sugar Beet Genetics and Breeding, Heilongjiang Province Common College, College of Advanced Agriculture and Ecological Environment, Heilongjiang University, Harbin 150080, China
Lingqing Xu: Key Laboratory of Sugar Beet Genetics and Breeding, Heilongjiang Province Common College, College of Advanced Agriculture and Ecological Environment, Heilongjiang University, Harbin 150080, China
Hao Wang: Key Laboratory of Sugar Beet Genetics and Breeding, Heilongjiang Province Common College, College of Advanced Agriculture and Ecological Environment, Heilongjiang University, Harbin 150080, China
Wang Xing: Key Laboratory of Sugar Beet Genetics and Breeding, Heilongjiang Province Common College, College of Advanced Agriculture and Ecological Environment, Heilongjiang University, Harbin 150080, China
Baiquan Song: Key Laboratory of Sugar Beet Genetics and Breeding, Heilongjiang Province Common College, College of Advanced Agriculture and Ecological Environment, Heilongjiang University, Harbin 150080, China
Qiuhong Wang: Key Laboratory of Sugar Beet Genetics and Breeding, Heilongjiang Province Common College, College of Advanced Agriculture and Ecological Environment, Heilongjiang University, Harbin 150080, China

Agriculture, 2024, vol. 14, issue 7, 1-14

Abstract: Rhizosphere environments play a vital role in the nutrient cycling of crops and soil organic nitrogen mineralization. Sugar beet is a highly nitrogen (N)-demanding crop, and it is necessary to explore the relationship between the sugar beet root exudates, the microbial community, and nitrogen utilization. In this study, a special separation method was employed to create rhizosphere (H3) and non-rhizosphere (H2 and H1) environments for sugar beet. After 50 d of cultivation in nearly inorganic-free soil, the microbial diversity and its correlation with root metabolites and N were examined. The results showed that in H3, the inorganic N content was over 23 times higher than in H1 and H2, with a 13.1% higher relative abundance of ammonia-oxidizing bacteria compared to H2 and a 32% higher abundance than H1. The relative abundance of nitrite-oxidizing bacteria was also 18.8% higher than in H1. Additionally, a significant positive correlation was observed between inorganic nitrogen content and serine (Ser) and isoleucine (Ile). The organic nitrogen content exhibited positive correlations with glycine (Gly), alanine (Ala), and tyrosine (Tyr) but displayed negative correlations with certain amino acids, organic acids, and glucose. The co-linearity network indicated that the microbial composition in H3 also exhibited higher node connectivity. It can be inferred that under the influence of sugar beet root exudates, the changes in the rhizosphere’s microbial diversity were more intricate, thereby benefiting soil nitrogen cycling and inorganic N accumulation. These findings provide profound insight into sugar beet soil organic nitrogen mineralization and contribute to the sustainable and environmentally friendly development of modern agriculture.

Keywords: sugar beet; nitrogen mineralization; root exudates; rhizosphere microorganisms (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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