Synergistic effects of SAP and PGPR on physiological characteristics of leaves and soil enzyme activities in the rhizosphere of poplar seedlings under drought stress

被引:0
|
作者
Jing, Dawei [1 ]
Liu, Fangchun [2 ]
Li, Shanwen [3 ]
Dong, Yufeng [4 ]
机构
[1] Dezhou Univ, Coll Ecol Resources & Environm, Dezhou, Peoples R China
[2] Shandong Acad Forestry, Inst Resource & Environm, Jinan, Peoples R China
[3] Shandong Acad Forestry, Key Lab Genet Improvement Forest Trees Shandong Pr, Jinan, Peoples R China
[4] Shandong Acad Forestry, Jinan, Peoples R China
来源
FRONTIERS IN PLANT SCIENCE | 2024年 / 15卷
基金
中国国家自然科学基金;
关键词
endogenous hormone balance; plant growth-promoting rhizobacteria; <italic>populus</italic> x <italic>canadensis</italic> 'huaxiong 1' seedling; rhizosphere soil enzyme; super absorbent polymers; SUPER-ABSORBENT POLYMERS; PLANT-GROWTH; PARAMETERS;
D O I
10.3389/fpls.2024.1485362
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Super absorbent polymers (SAP) provide moisture conditions that allow plant growth-promoting rhizobacteria (PGPR) to enter the soil for acclimatization and strain propagation. However, the effects of SAP co-applied with PGPR on the physiological characteristics of leaves and rhizosphere soil enzyme activities of poplar seedlings are not well understood. Here, a pot experiment using one-year-old poplar seedlings with five treatments, normal watering, drought stress (DR), drought stress + SAP (DR+SAP), drought stress + Priestia megaterium (DR +PGPR) and drought stress + SAP + P. megaterium (DR+S+P), was performed to analyze the contents of non-enzymatic antioxidants, osmotic regulators and hormones in leaves, as well as rhizosphere soil enzyme activities. Compared with normal watering, the DR treatment significantly decreased the contents of dehydroascorbate (DHA; 19.08%), reduced glutathione (GSH; 14.18%), oxidized glutathione, soluble protein (26.84%), indoleacetic acid (IAA; 9.47%), gibberellin (GA) and zeatin (ZT), the IAA/abscisic acid (ABA), GA/ABA, ZT/ABA and (IAA+GA+ZT)/ABA (34.67%) ratios in leaves, and the urease and sucrase activities in the rhizosphere soil. Additionally, it significantly increased the soluble sugar, proline and ABA contents in leaves. However, in comparison with the DR treatment, the DR+S+P treatment significantly increased the DHA (29.63%), GSH (15.13%), oxidized glutathione, soluble protein (29.15%), IAA (12.55%) and GA contents, the IAA/ABA, GA/ABA, ZT/ABA and (IAA+GA+ZT)/ABA (46.85%) ratios in leaves, and the urease, sucrose and catalase activities in rhizosphere soil to different degrees. The soluble sugar, proline and ABA contents markedly reduced in comparison to the DR treatment. The effects of the DR+SAP and DR+PGPR treatments were generally weaker than those of the DR+S+P treatment. Thus, under drought-stress conditions, the simultaneous addition of SAP and P. megaterium enhanced the drought adaptive capacities of poplar seedlings by regulating the non-enzymatic antioxidants, osmotic regulators, and endogenous hormone content and balance in poplar seedling leaves, as well as by improving the rhizosphere soil enzyme activities.
引用
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页数:11
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