文献类型： 外文期刊

作者： Chen, Zhao ¹ ; Zhou, Wennan ² ; Sui, Xin ¹ ; Xu, Nan ¹ ; Zhao, Tian ³ ; Guo, Zhipeng ¹ ; Niu, Junpeng ¹ ; Wang, Quanzhen ¹ ;

作者机构： 1.Northwest Agr & Forestry Univ, Coll Anim Sci & Technol, Dept Grassland Sci, Xianyang, Peoples R China

2.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, Lanzhou, Peoples R China

3.Guizhou Acad Agr Sci, Inst Anim Husb & Vet Med, Guiyang, Peoples R China

关键词： rhizosphere endophytic; Pseudomonas sp; Y1; switchgrass cv; blackwell; maternal lateral root; seedling growth

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）

ISSN： 1664-462X

年卷期： 2022 年 12 卷

页码：

收录情况： SCI

摘要： Switchgrass, a C4 plant with high potential as a bioenergy source, is unsteady in yield under sub-optimal conditions. Bacteria containing 1-aminocyclopropane-1-carboxylate synthase (ACC) deaminase can promote plant growth. We isolated bacteria containing ACC deaminase activity from switchgrass rhizosphere using an orthogonal matrix experimental design with four factors (bacterial liquid concentration, bacterial liquid treatment time, nitrogen content, and NaCl) to quantitatively investigate the effects and pairwise interactions on the seedling growth. Pseudomonas sp. Y1, isolated from the switchgrass cv. Blackwell rhizomes was selected. We optimized the inoculation bacterial concentration, treatment time, NaCl, and nitrogen concentration for the seedling growth. The optimal bacterial concentration, treatment time, NaCl, and nitrogen content was 0.5-1.25 OD at 600 nm, 3 h, 60-125 mM and 158 mg L-1, respectively. Pseudomonas sp. Y1 significantly increased the total root length, root surface, shoot length, and fresh and dry weight through an effective proliferation of the number of first-order lateral roots and root tips. This indicated that Pseudomonas sp. Y1 has a higher potential to be used as a plant growth-promoting rhizobacteria bacteria.