scholarly journals Isolation, Root Colonization and Evaluation of Some Plant Growth-promoting Rhizobacteria in Paddy Rice

2017 ◽  
Vol 50 (3) ◽  
pp. 135-149
Author(s):  
Ui-Gum Kang ◽  
Hyang-Mi Park ◽  
Jee-Yeon Ko ◽  
Jae-Saeng Lee ◽  
Weon-Tai Jeon ◽  
...  
Keyword(s):  
Plant Growth ◽  
Root Colonization ◽  
Plant Growth Promoting Rhizobacteria ◽  
Paddy Rice ◽  
Plant Growth Promoting ◽  
Growth Promoting

scholarly journals The Interactions of Rhizodeposits with Plant Growth-Promoting Rhizobacteria in the Rhizosphere: A Review

Agriculture ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 142 ◽  
Author(s):  
Mohammad Hassan ◽  
John McInroy ◽  
Joseph Kloepper
Keyword(s):  
Plant Growth ◽  
Root Exudates ◽  
Root Colonization ◽  
Plant Growth Promoting Rhizobacteria ◽  
Border Cells ◽  
Physiological Processes ◽  
Plant Growth Promoting ◽  
Root Border Cells ◽  
Pathogenic Microbes ◽  
Growth Promoting

Rhizodeposits, root exudates, and root border cells are vital components of the rhizosphere that significantly affect root colonization capacity and multiplication of rhizosphere microbes, as well as secretion of organic bioactive compounds. The rhizosphere is an ecological niche, in which beneficial bacteria compete with other microbiota for organic carbon compounds and interact with plants through root colonization activity to the soil. Some of these root-colonizing beneficial rhizobacteria also colonize endophytically and multiply inside plant roots. In the rhizosphere, these components contribute to complex physiological processes, including cell growth, cell differentiation, and suppression of plant pathogenic microbes. Understanding how rhizodeposits, root exudates, and root border cells interact in the rhizosphere in the presence of rhizobacterial populations is necessary to decipher their synergistic role for the improvement of plant health. This review highlights the diversity of plant growth-promoting rhizobacteria (PGPR) genera, their functions, and the interactions with rhizodeposits in the rhizosphere.

scholarly journals Investigation of salt-tolerant rhizosphere bacteria from seawater-intruding paddy rice field in Vietnam

2020 ◽  
Vol 42 (3) ◽  
Author(s):  
Ho Tu Cuong ◽  
Bui Van Cuong ◽  
Lam Thuong Thuong ◽  
Tran Mai Hoang ◽  
Luong Thi Thu Huong ◽  
...  
Keyword(s):  
Plant Growth ◽  
Plant Growth Promoting Rhizobacteria ◽  
Rice Paddy ◽  
Paddy Rice ◽  
Salt Tolerant ◽  
Plant Growth Promoting ◽  
Paddy Rice Field ◽  
Growth Promoting ◽  
Indole 3 Acetic Acid ◽  
Number Of Bacteria

Salt‐tolerant plant growth‐promoting rhizobacteria (ST‐PGPR) are known as potential tools to improve rice salinity tolerance. In this study, we aimed to investigate the plant growth‐promoting rhizobacteria community richness of the paddy rice fields in Soc Trang and Ben Tre Provinces where were seriously affected by sea level rise. The salinity in the sampling sites ranged from 0.14‰ to 2.17‰ in November 2018, the rainy season. The microbial abundance of samples was evaluated by spreading the samples in tryptic soy agar (TSA) medium supplemented with various concentrations of NaCl. With the increase of salt concentration up to 10% NaCl, a total number of bacteria decreased for all the samples, ranging from 106 to 104 CFU/g, and bacterial colonies were not observed at 30% NaCl. Among a total of 48 salt-resisting bacteria isolated from the rice paddy field mud surrounding the rice root, 22 isolates were able to produce indole-3-acetic acid (IAA: phytohormone for the plant growth). Seventeen out of 48 isolates were able to grow in the medium without nitrogen or phosphor sources. Six isolates having high IAA producing activity, nitrogen fixation and phosphate solubilization were belonged to Bacillus (DT6, LT16, and LHT8), Halobacillus (DT8), Aeromonas (LHT1), and Klebsiella (LHT7) genera. All the sequences of the strains DT6, DT8, LT16, LHT1, LHT7, and LHT8 were registered in the GeneBank with the accession numbers MK335670, MK335671, MK335672, MK335673, MK335674, and MK335675, respectively. 

In-furrow spray as a delivery system for plant growth-promoting rhizobacteria and other rhizosphere-competent bacteria

1991 ◽  
Vol 37 (8) ◽  
pp. 632-636 ◽  
Author(s):  
R. M. Zablotowicz ◽  
E. M. Tipping ◽  
F. M. Scher ◽  
M. Ijzerman ◽  
J. W. Kloepper
Keyword(s):  
Plant Growth ◽  
Field Experiments ◽  
Root Colonization ◽  
Cell Concentration ◽  
Plant Growth Promoting Rhizobacteria ◽  
Agronomic Practices ◽  
Colony Forming Units ◽  
Plant Growth Promoting ◽  
Maximum Root ◽  
Growth Promoting

A series of greenhouse and field experiments were conducted to evaluate aqueous in-furrow spray techniques for inoculating crop plants with cell suspensions of rhizosphere-competent root-colonizing bacteria. Maximum root colonization of soybean or canola roots by strains of Serratia, Pseudomonas, and Bradyrhizobium occurred using log 8 colony-forming units (cfu)/mL in the spray in greenhouse conditions. Field experiments evaluating a dose reponse demonstrated that maximum soybean root colonization by strains of Serratia or Pseudomonas was achieved between log 7 and 8 cfu/mL, while root colonization by a Bacillus strain was not related to cell concentration in the spray suspension. Root colonization greater than log 4.5 cfu/g root fresh weight was achieved for most strains by in-furrow spray application of a suspension of log 8 cfu/mL at a rate of 10 mL/m for canola, soybean, and wheat, while root colonization of corn ranged from a maximum of log 3.4 to no recovery. In-furrow spray may be a useful method for inoculating plants with rhizosphere-competent bacteria for experimental purposes, thereby avoiding interactions of formulation. It may also have some value for commercial delivery of bacteria to agricultural crops when it is compatible with accepted agronomic practices. Key words: rhizosphere, plant growth promoting rhizobacteria, formulation, Pseudomonas, root colonization.

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