scholarly journals Salinity tolerance of Dodonaea viscosa L. inoculated with plant growth-promoting rhizobacteria: assessed based on seed germination and seedling growth characteristics

2017 ◽  
Vol 44 (1) ◽  
pp. 20-27
Author(s):  
Sonia Yousefi ◽  
Davoud Kartoolinejad ◽  
Mohammad Bahmani ◽  
Reza Naghdi
Keyword(s):  
Plant Growth ◽  
Pseudomonas Putida ◽  
Salinity Stress ◽  
Plant Growth Promoting Rhizobacteria ◽  
Germination Percentage ◽  
Azotobacter Chroococcum ◽  
Azospirillum Lipoferum ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Different Strains

AbstractThe study was conducted to evaluate the potential of different strains of plant growth-promoting rhizobacteria (PGPR) to reduce the effects of salinity stress on the medicinal hopbush plant. The bacterium factor was applied at five levels (non-inoculated, inoculated by Pseudomonas putida, Azospirillum lipoferum + Pseudomonas putida, Azotobacter chroococcum + Pseudomonas putida, and Azospirillum lipoferum + Azotobacter chroococcum + Pseudomonas putida), and the salinity stress at six levels: 0, 5, 10, 15, 20, and 50 dS m-1. The results revealed that Pseudomonas putida showed maximal germination percentage and rate at 20 dS m-1(18.33% and 0.35 seed per day, respectively). The strongest effect among the treatments was obtained with the treatment combining the given 3 bacteria at 15 dS m-1salinity stress. This treatment increased the root fresh and dry weights by 31% and 87.5%, respectively (compared to the control). Our results indicate that these bacteria applied on hopbush affected positively both its germination and root growth. The plant compatibility with the three bacteria was found good, and the treatments combining Pseudomonas putida with the other one or two bacteria discussed in this study can be applied in nurseries in order to restore and extend the area of hopbush forests and akin dry stands.

Low temperature growth, freezing survival, and production of antifreeze protein by the plant growth promoting rhizobacterium Pseudomonas putida GR12-2

1995 ◽  
Vol 41 (9) ◽  
pp. 776-784 ◽  
Author(s):  
Xiuying Sun ◽  
Marilyn Griffith ◽  
J. J. Pasternak ◽  
Bernard R. Glick
Keyword(s):  
Plant Growth ◽  
Pseudomonas Putida ◽  
Growth Medium ◽  
Polyacrylamide Gel Electrophoresis ◽  
Plant Growth Promoting Rhizobacteria ◽  
Antifreeze Protein ◽  
High Arctic ◽  
Major Protein ◽  
Plant Growth Promoting ◽  
Growth Promoting

The plant growth promoting rhizobacterium Pseudomonas putida GR12-2 was originally isolated from the rhizosphere of plants growing in the Canadian High Arctic. Here we report that this bacterium was able to grow and promote root elongation of both spring and winter canola at 5 °C, a temperature at which only a relatively small number of bacteria are able to proliferate and function. In addition, the bacterium survived exposure to freezing temperatures, i.e., −20 and −50 °C. In an effort to determine the mechanistic basis for this behaviour, it was discovered that following growth at 5 °C, P. putida GR12-2 synthesized and secreted to the growth medium a protein with antifreeze activity. Analysis of the spent growth medium, following concentration by ultrafiltration, by SDS-polyacrylamide gel electrophoresis revealed the presence of one major protein with a molecular mass of approximately 32–34 kDa and a number of minor proteins. However, at this point it is not known which of these proteins contains the antifreeze activity.Key words: plant growth promoting rhizobacteria, PGPR, bacterial fertilizer, soil bacteria, antifreeze protein.

Plant growth–promoting rhizobacteria and their functional role in salinity stress management

2020 ◽  
pp. 151-160 ◽  
Author(s):  
Akanksha Gupta ◽  
Sandeep Kumar Singh ◽  
Manoj Kumar Singh ◽  
Vipin Kumar Singh ◽  
Arpan Modi ◽  
...  
Keyword(s):  
Plant Growth ◽  
Stress Management ◽  
Salinity Stress ◽  
Functional Role ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting

scholarly journals Effect of plant growth promoting rhizobacteria (PGPR) and IBA treatments on rooting in cuttings of apple (Malus × domestica Borkh.) clonal rootstock Merton 793

2017 ◽  
Vol 9 (2) ◽  
pp. 1135-1138
Author(s):  
Pramod Verma ◽  
P. S. Chauhan ◽  
J. S. Chandel
Keyword(s):  
Plant Growth ◽  
Bacillus Licheniformis ◽  
Dry Weight ◽  
Plant Growth Promoting Rhizobacteria ◽  
Bacillus Sp ◽  
Main Shoot ◽  
Primary Roots ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Different Strains

The preliminary studies on the effect of different strains of plant growth promoting rhizobacteria (PGPR) alone and in combination with IBA at 1000 ppm on rooting in cuttings of apple clonal rootstock Merton 793 were carried out during 2012-13. The PGPR strains (RG (1)3 – Bacillus sp.), B6 – Bacillus licheniformis and R3 (3) – Sirretia sp. alone failed to induce rooting response in cuttings of apple clonal rootstock Merton 793. The results revealed that IBA 2500 ppm recorded the maximum rooting (65 %), number of primary roots (5.00), length (28.43 cm) and diameter (3.25 mm) of primary roots, fresh (3.67 g) and dry weight (2.59 g) of roots, length of main shoot (134.14cm), diameter of main shoot (8.18 mm), fresh (30.40 g) and dry weight (22.60 g) of shoots in cuttings of Merton 793. However, the PGPR strains RG (1)3 – Bacillus sp., B6 – Bacillus licheniformis and R3 (3) – Sirretia sp. in combination with IBA 1000 ppm showed improvement in rooting of cuttings to the extent of 10, 15 and 5 per cent rooting, respectively and growth of the rooted plants. IBA at 2500 ppm resulted better rooting and growth of rooted plants. Hence, this treatment is suggested for commercial propagation of apple clonal rootstock Merton 793 through cuttings.

scholarly journals Effects of Plant Growth Promoting Rhizobacteria on Seed Germination Characteristics of Tomato and Lettuce

2015 ◽  
Vol 1 (2) ◽  
pp. 35-40 ◽  
Author(s):  
Jonathan Mangmang ◽  
Rosalind Deaker ◽  
Gordon Rogers
Keyword(s):  
Plant Growth ◽  
Germination Rate ◽  
Seedling Emergence ◽  
Plant Growth Promoting Rhizobacteria ◽  
Rhizospheric Bacteria ◽  
Azospirillum Brasilense Sp7 ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Germination Vigor ◽  
Different Strains

Plant growth promoting rhizobacteria (PGPR) represent a wide genera of rhizospheric bacteria which, when introduced in association with the host plant in proper amount, can enhance plant growth and productivity. A series of experiments were conducted to determine the germination responses of tomato and lettuce to PGPR inoculation. Seeds were inoculated with different strains of Azospirillum brasilense Sp7, Sp7-S and Sp245, Herbaspirillum seropedicea and Burkholderia phytofirmans PsJNT. The results reveal that Sp7-S inoculation yielded better germination rate and total germination of tomato. PGPR inoculation, except Sp7, produced longer (28%) and heavier (37%) roots with superior vigor. In lettuce, PGPR strains, except B. phytofirmans PsJNT, and Sp7 and B. phytofirmans PsJNT, enhanced germination vigor and length of roots (26%), respectively. The results provide further evidence concerning their importance as PGPR and indicate the potential of exploiting some of these PGPR to improve seedling emergence and establishment of vegetables.

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