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.

scholarly journals Plant growth promoting rhizobacteria from Juan Fernández archipelago improve germination rate of endangered plant Solanum fernandezianum Phil.

2020 ◽  
Vol 80 (1) ◽  
pp. 41-49
Author(s):  
Jorge Carrasco-Fernández ◽  
Matías Guerra ◽  
Jean Franco Castro ◽  
Luis Bustamante ◽  
Lorena Barra-Bucarei ◽  
...  
Keyword(s):  
Plant Growth ◽  
Germination Rate ◽  
Plant Growth Promoting Rhizobacteria ◽  
Endangered Plant ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Juan Fernández Archipelago

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 Effect of plant growth promoting rhizobacteria (PGPR) on the growth of habanero pepper (Capsicum chinense Jacq.)

2021 ◽  
Author(s):  
Ricardo Antonio Chiquini-Medina ◽  
Crescencio de la Cruz Castillo-Aguilar ◽  
Guillermo Carrillo-Castañeda ◽  
Carlos Fredy Ortíz-García ◽  
Alberto Córdova-Gaspar ◽  
...  
Keyword(s):  
Plant Growth ◽  
Seedling Emergence ◽  
Plant Growth Promoting Rhizobacteria ◽  
Fresh Fruit ◽  
Control Treatment ◽  
Pepper Plant ◽  
Capsicum Chinense ◽  
Habanero Pepper ◽  
Plant Growth Promoting ◽  
Growth Promoting

Objective: To evaluate the effect of plant growth promoting rhizobacteria (PGPR) on the growth and production of habanero pepper (Capsicum chinense Jacq.). Design/Methodology/Approach: Twelve strains of PGPR were evaluated in habanero pepper seeds of the orange variety. The species of PGPR were Rhizobium leguminosarum: (CP Méx 46), Pseudomonas spp: (P fluorescens, C2, A7, A9, A9m, Avm); Azospirillum, (Sp7, Sp 59, UAP 40, UAP154), plus a control treatment, giving a total of 13 treatments. The study variables were seedling emergence (SE), plant height (PH), white fruit incidence (WFI), virotic plants (VP), days to flowering (DF) and fresh fruit yield (FFY). The experimental design was random blocks with four repetitions. Results: An effect on the growth of habanero pepper from PGPRs was found in all the variables studied. Seedling emergence and their height was favored by strains Sp9 (84.16%) and A7 (73.44). The number of white flies decreased with the inoculation of CP Méx 46, while the incidence of virosis decreased in plants inoculated with SP9 (32.00%). The highest yield of fresh fruit was found in plants with the strain AVM with 16636 kg ha-1. Findings/Conclusions: The effect of inoculation with PGPR is in function of the strain used and the study variable, growth stage and development stage of the habanero pepper plant.

Plant growth promoting rhizobacteria for winter wheat

1990 ◽  
Vol 36 (4) ◽  
pp. 265-272 ◽  
Author(s):  
J. Renato de Freitas ◽  
James J. Germida
Keyword(s):  
Plant Growth ◽  
Winter Wheat ◽  
Seedling Emergence ◽  
Leptosphaeria Maculans ◽  
Plant Growth Promoting Rhizobacteria ◽  
Shoot Biomass ◽  
Pseudomonas Cepacia ◽  
Plant Growth Promoting ◽  
Growth Promoting

The association of winter wheat (Triticum aestivum L. cv. Norstar) with root-colonizing bacteria (rhizobacteria) was studied in potted soil experiments in the growth chamber. Thirty-six known bacteria, some of which have been reported to stimulate plant growth, and 75 isolates obtained from the rhizosphere of winter wheat were tested for their effects on plant growth and development in two different soils. Two known bacteria and 12 isolates stimulated growth of winter wheat. Of these, the most effective were nine isolates that significantly (P < 0.01) increased plant height, root and shoot biomass, and number of tillers. The plant growth promoting effects of isolates were different in the two soils. Three of these strains were tentatively classified as Pseudomonas aeruginosa, and two each as Pseudomonas cepacia, Pseudomonas fluorescens, and Pseudomonas putida. Some isolates induced significant increases in seedling emergence rates and (or) demonstrated antagonism in vitro against Rhizoctonia solani and Leptosphaeria maculans. These results demonstrate the potential use of plant growth promoting rhizobacteria as inoculants for winter wheat. Key words: pseudomonads, plant growth promoting rhizobacteria, winter wheat, rhizosphere, bacterial inoculants.

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.

scholarly journals Effects of plant growth promoting rhizobacteria (PGPR) and cover crops on seed germination and early establishment of field dodder (Cuscuta campestris Yunk.)

2017 ◽  
Vol 32 (2) ◽  
pp. 105-111 ◽  
Author(s):  
Marija Saric-Krsmanovic ◽  
Dragana Bozic ◽  
Ljiljana Radivojevic ◽  
Jelena Gajic-Umiljendic ◽  
Ljiljana Santric ◽  
...  
Keyword(s):  
Seed Germination ◽  
Plant Growth ◽  
Cover Crops ◽  
Germination Rate ◽  
Red Clover ◽  
Plant Growth Promoting Rhizobacteria ◽  
Initial Growth ◽  
Cuscuta Campestris ◽  
Plant Growth Promoting ◽  
Growth Promoting

Several bacterial cultures: Bacillus licheniformis (MO1), B. pumilus (MO2), and B. amyloliquefaciens (MO3), isolated from manure; B. megatherium ZP6 (MO4) isolated from maize rhizosphere; Azotobacter chroococcum Ps1 (MO5) and Pseudomonas fluorescens (MO6), were used to test the influence of plant growth promoting rhizobacteria (PGPR) on seed germination and germination rate of field dodder (Cuscuta campestris Yunk.). Also, to examine the effect of host seeds on germination and initial growth of seedlings of field dodder plants in the dark and under white light, the seeds of four host plants were used (watermelon, red clover, alfalfa and sugar beet). Germinated seeds were counted daily over a ten-day period and the length of seedlings was measured on the final day. The results show that treatments MO3, MO4 and MO6 had inhibitory effects (15%, 65% and 52%, respectively), while treatments MO1, MO2 and MO5 had stimulating effects (3%, 3% and 19%, respectively) on seed germination of field dodder. The data for host seeds show that light was a significant initial factor (83-95%, control 95%) for stimulating seed germination of field dodder plants, apart from host presence (73-79%, control 80%).

scholarly journals Exploring biofertilizer potential of plant growth-promoting rhizobacteria Bacillus clausii strain B8 (MT305787) on Brassica napus and Medicago sativa

2021 ◽  
Vol 49 (4) ◽  
pp. 12484
Author(s):  
Hakima OULEBSIR-MOHANDKACI ◽  
Farida BENZINA-TIHAR ◽  
Rima HADJOUTI
Keyword(s):  
Acetic Acid ◽  
Brassica Napus ◽  
Plant Growth ◽  
Medicago Sativa ◽  
Inorganic Phosphate ◽  
Germination Rate ◽  
Plant Growth Promoting Rhizobacteria ◽  
Lytic Enzymes ◽  
Plant Growth Promoting ◽  
Growth Promoting

Plant Growth Promoting Rhizobacteria (PGPR) are soil bacteria that can stimulate plant growth by supplying substances that are usually in limited quantities in the soil especially phosphorous, nitrogen and growth hormone such as indole acetic acid (AIA). These bacteria can also slow the growth of plant pathogens through the production of several antimicrobial metabolites. To investigate the role of rhizobacteria as a biostimulant agent a novel bacterium B8, isolated from the rhizospheric soil of medlar (Mespilus germanica L.- Family Rosaceae), was evaluated on Brassica napus and Medicago sativa. In addition to the classical methods of identification (physiological and biochemical tests), B8 was identified by 16S rRNA gene sequencing as Bacillus clausii. The ability of the strain to produce lytic enzymes such as cellulases, chitinases, pectinases, and phospholipases was studied.  Furthermore, the strain B8 was tested for the capability to produce plant growth metabolites like phosphatases and phytases in order to solubilize inorganic phosphate and production of siderophores, cyanhydric acid (HCN) and indole-3-acetic acid. The strain was able to produce lytic enzymes, with an intense production of siderophores and to solubilize inorganic phosphate. Result of in vivo experiments indicated that the application of B8 at 107 CFU/mL, improved markedly the germination rate of rapeseed, whereas alfalfa seeds treated with the same strain showed a lower germination rate than the controls. The vegetative growth parameters; Roots length, lateral roots number, stem length, number of leaves, diameters of stems and plant weight were significantly improved. We also noted capacity of bacteria to colonize root systems of both plants B. napus and M. sativa in one week of inoculation.  The overall results of this study showed that B clausii B8 has a great potential to be commercialized as a biostimulant agent and provide promising new option for sustainable agriculture.

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