|Table of Contents|

Effects of PGPR Bacteria on Physiological Characteristics of Ryegrass Plants Under Salt Stress

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2024年10
Page:
55-60
Research Field:
Publishing date:

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Title:
Effects of PGPR Bacteria on Physiological Characteristics of Ryegrass Plants Under Salt Stress
Author(s):
CHEN Jia1; YANG Cairong1; 2; QI Weiliang3; LIN Xin1; LI Shishi1; LIU Songqing1; 2
(1.College of Chemistry and Life Sciences,Chengdu Normal University,Chengdu,Sichuan 611130;2.Sichuan Provincial Key Laboratory for Development and Utilization of Characteristic Horticultural Biological Resources,Chengdu,Sichuan 611130;3.College of Agriculture and Forestry,Longdong University,Qingyang,Gansu 745000)
Keywords:
salt stress; physiological index; ryegrass
PACS:
S 543+.6
DOI:
10.11937/bfyy.20233451
Abstract:
Taking ryegrass as the test material,a pot experiment was conducted to study the effects of inoculating rhizosphere growth promoting bacteria Bacillus subtilis CP5 (T1),LM2 (T2),T3 (mixed bacterial agent,T1∶T2=1∶1) on the physiological characteristics of ryegrass under different concentrations of NaCl treatments,in order to provide reference for PGPR application.The results showed that,1) inoculation with T1 bacterial agent could reduce MDA content,increase soluble sugar content,CAT activity,and SOD activity under relatively high concentration (500,700 mmol·L-1 NaCl) salt stress.2) After inoculation with T2 bacterial agent,the MDA content of ryegrass was reduced and the soluble sugar content,POD,SOD,and CAT activities were increased under relatively high concentration (500,700 mmol·L-1 NaCl) salt stress.3) Under different concentrations of salt stress,inoculation with T3 bacterial agent could increase soluble sugar content,proline (Pro) content,peroxidase (POD),superoxide dismutase (SOD),catalase (CAT) activity,and reduce malondialdehyde (MDA) content.Especially under 300 mmol·L-1 salt stress,the SOD activity of T3 inoculated plants significantly increased by 44.42% compared to the non inoculated group.Under 500 mmol·L-1 salt stress,the Pro content,soluble sugar content,and CAT activity of T3 inoculated plants significantly increased by 17.42%,100.74%,and 91.60% compared to the non inoculated group,respectively.Under 700 mmol·L-1 salt stress,the MDA content of T3 inoculated plants significantly decreased by 43.83% and POD activity significantly increased by 69.29% compared to the non inoculated group (P<0.05).In conclusion,this study indicated that inoculation with rhizosphere growth promoting bacteria Bacillus subtilis could help alleviate salt stress on plant growth,and the effect of mixed microbial agents on alleviating salt stress was significantly greater than that of single microbial agents,indicating the potential for development and application as a growth microbial agent for plants under salt stress.

References:

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Last Update: 2024-06-06