Arid
DOI10.1002/jobm.201800309
Exopolysaccharides producing rhizobacteria and their role in plant growth and drought tolerance
Naseem, Hafsa1; Ahsan, Muhammad2; Shahid, Muhammad A.3; Khan, Naeem1
通讯作者Khan, Naeem
来源期刊JOURNAL OF BASIC MICROBIOLOGY
ISSN0233-111X
EISSN1521-4028
出版年2018
卷号58期号:12页码:1009-1022
英文摘要

Drought stress not only effect the population and activities of microorganisms inhabiting the rhizosphere but also various physiological and biochemical process in plants that is, photosynthesis, respiration, translocation, uptake of ions, carbohydrates, and nutrient metabolism. Plant growth promoting rhizobacteria (PGPR) and their exopolysaccharides (EPS) showed profound effects on plant growth and drought tolerance. Reactions of bacteria to drought stress at various organizational levels are different which depends on intensity of stress, duration, species, and growth stage. PGPR could be effectively utilized in developing strategies to facilitate water conservation strategies of plants. They have the ability to improve plant growth directly by enhancing level of phytohormones, siderophore, biofilm, and exopolysaccharides production and by increasing the nutrient availability in the rhizosphere or indirectly by protecting plants from pathogen attack. EPS producing bacteria are capable to maintain higher soil moisture content and growth of plants even under severe dried sandy soils. The evidence of survival of rhizobacteria under low moisture content obtained from the fact of rhizobacterial occurrence in the soil of desert and effective nodule formation in desert soil. Beside this, EPS produced by PGPR form rhizosheath around the roots and thus protect the plant roots from desiccation for a longer period of time. Important role exhibited by exopolysaccharides includes, protection from desiccation, microbial aggregation, plant-microbe interaction, surface attachment, bioremediation and its use by many industries for stabilizing, thickening, coagulating, gelling, suspending and for film forming. Plants inoculated with EPS-producing bacteria showed higher accumulation of proline, sugars, and free amino acids under water deficit stress. Biofilms formed by the PGPR around the roots are made up of bacterial populations or bacterial communities that encased inside the polymeric extracellular matrix formed by bacteria itself, they adhered to the external surfaces that contain sufficient moisture. It is concluded that the application of PGPR in combination with their EPS is a promising measure to combat drought stress thus, increasing global food security.


英文关键词drought EPS PGPR water conservation
类型Review
语种英语
国家Pakistan ; USA
收录类别SCI-E
WOS记录号WOS:000451862800001
WOS关键词POLYMERIC SUBSTANCES EPS ; ARBUSCULAR MYCORRHIZAL FUNGI ; LACTIC-ACID BACTERIA ; ANTIOXIDANT ENZYME-ACTIVITY ; STREPTOCOCCUS-THERMOPHILUS ; PROMOTING RHIZOBACTERIA ; AZOSPIRILLUM-BRASILENSE ; STRUCTURAL-CHARACTERIZATION ; EXTRACELLULAR POLYSACCHARIDES ; PHOSPHATE SOLUBILIZATION
WOS类目Microbiology
WOS研究方向Microbiology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/210693
作者单位1.Quaid I Azam Univ, Dept Plant Sci, Islamabad, Pakistan;
2.Allama Iqbal Open Univ, Dept Chem, Islamabad, Pakistan;
3.Univ Florida, Inst Food & Agr Sci, Hort Sci Dept, Gainesville, FL 32611 USA
推荐引用方式
GB/T 7714
Naseem, Hafsa,Ahsan, Muhammad,Shahid, Muhammad A.,et al. Exopolysaccharides producing rhizobacteria and their role in plant growth and drought tolerance[J],2018,58(12):1009-1022.
APA Naseem, Hafsa,Ahsan, Muhammad,Shahid, Muhammad A.,&Khan, Naeem.(2018).Exopolysaccharides producing rhizobacteria and their role in plant growth and drought tolerance.JOURNAL OF BASIC MICROBIOLOGY,58(12),1009-1022.
MLA Naseem, Hafsa,et al."Exopolysaccharides producing rhizobacteria and their role in plant growth and drought tolerance".JOURNAL OF BASIC MICROBIOLOGY 58.12(2018):1009-1022.
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