1  
[PERSON]  
1 Qingdao Academy of Agricultural Sciences, Qingdao 266100, China; [EMAIL_ADDRESS] (X.Z. ); [EMAIL_ADDRESS] (S.O. ); [EMAIL_ADDRESS] (E.S. ); [EMAIL_ADDRESS] (X.L.) 1  
[PERSON]  
1 Qingdao Academy of Agricultural Sciences, Qingdao 266100, China; [EMAIL_ADDRESS] (X.Z. ); [EMAIL_ADDRESS] (S.O. ); [EMAIL_ADDRESS] (E.S. ); [EMAIL_ADDRESS] (X.L.) 1  
[PERSON]  
1 Qingdao Academy of Agricultural Sciences, Qingdao 266100, China; [EMAIL_ADDRESS] (X.Z. ); [EMAIL_ADDRESS] (S.O. ); [EMAIL_ADDRESS] (E.S. ); [EMAIL_ADDRESS] (X.L.) 1  
[PERSON]  
1 Qingdao Academy of Agricultural Sciences, Qingdao 266100, China; [EMAIL_ADDRESS] (X.Z. ); [EMAIL_ADDRESS] (S.O. ); [EMAIL_ADDRESS] (E.S. ); [EMAIL_ADDRESS] (X.L.) 1  
[PERSON]  
1 Qingdao Academy of Agricultural Sciences, Qingdao 266100, China; [EMAIL_ADDRESS] (X.Z. ); [EMAIL_ADDRESS] (S.O. ); [EMAIL_ADDRESS] (E.S. ); [EMAIL_ADDRESS] (X.L.) 1  
[PERSON]  
1 Qingdao Academy of Agricultural Sciences, Qingdao 266100, China; [EMAIL_ADDRESS] (X.Z. ); [EMAIL_ADDRESS] (S.O. ); [EMAIL_ADDRESS] (E.S. ); [EMAIL_ADDRESS] (X.L.) 1  
[PERSON]  
1 Qingdao Academy of Agricultural Sciences, Qingdao 266100, China; [EMAIL_ADDRESS] (X.Z. ); [EMAIL_ADDRESS] (S.O. ); [EMAIL_ADDRESS] (E.S. ); [EMAIL_ADDRESS] (X.L.) 1  
[PERSON]  
1 Qingdao Academy of Agricultural Sciences, Qingdao 266100, China; [EMAIL_ADDRESS] (X.Z. ); [EMAIL_ADDRESS] (S.O. ); [EMAIL_ADDRESS] (E.S. ); [EMAIL_ADDRESS] (X.L.) 1  
[PERSON]  
1 Qingdao Academy of Agricultural Sciences, Qingdao 266100, China; [EMAIL_ADDRESS] (X.Z. ); [EMAIL_ADDRESS] (S.O. ); licsf1130@163. Endophytic bacteria thrive inside plant tissues and organs with no immediate impact on normal plant growth [8]. Over time, they may either cause damage to plants or promote plant growth under normal and/or stressful conditions [9]. Growth-promoting endophytic bacteria can enhance plant nutrient utilization, growth, and health via multiple approaches, including but not limited to enhancing plant resistance against phytopathogens, production of enzymes for nutrition solubilization, uptake and absorption, canonical phytohormone biosynthesis and modulation of their homeostasis, production and secretions of volatile organic acids and secondary metabolites, and heavy metal phytoremediation [3; 10; 11]. Endophytic bacteria-assisted acquisitions of macro- and micronutrients in plants especially involve nitrogen (N), phosphorus (P), and potassium (K) [3]. Legume-symbiotic nitrogen-fixing bacteria (NFB) have nitrogenase activity capable of transforming atmospheric nitrogen into plant-usable inorganic compounds [12]. Phosphorus-solubilizing bacteria (PSB) [13] and potassium-solubilizing bacteria (KSB) [14] can solubilize soil inorganic/organic phosphorus and potassium, respectively. These nutrients can be easily utilized by plants in their soluble forms. Endophytic bacteria may also produce auxins [15], cytokins [16], and/or gibberellins [17] to modulate plant hormonal homeostasis, which may have significant impacts on plant growth and development. Nitrogen fixation, nutrient solubilization, and phytohormone production activities are not mutually exclusive in growth-promoting endophytic bacteria, with some strains playing two or more roles in promoting plant nutrient uptake and utilization [9]. Cultivable endophytic bacteria only account for 0.01-10% of the total bacterial species. Their species/genera can be determined by morphology observation, Gram staining, biochemical/physiological assays, and 165 ribosomal RNA (rRNA) sequencing [18; 19; 20]. High-throughput 16S rRNA sequencing enables an accurate and complete investigation of endophytic bacterial community structures, species diversity, and abundance at the microbiome level, with no need for individual strain isolation and culture [21; 22; 23]. Considered to originate from the external environment, endophytic bacteria can be found in plant seeds, leaves, flowers, roots, and root nodules [24].