scholarly journals CHARACTERIZATION OF PSEUDOMONAS SP FROM RHIZOSPHERE OF TOMATO PLANTS (LYCOPERSICON ESCULENTUM) AND ITS EFFICACY ON PLANT GROWTH PROMOTION

2015 ◽  
Vol 3 (3) ◽  
pp. 114-121
Author(s):  
Pavan Kumar Agrawal ◽  
Rishi Kundan ◽  
Shruti Agrawal
Keyword(s):  
Lycopersicon Esculentum ◽  
Plant Growth ◽  
Plant Growth Promotion ◽  
Growth Promotion ◽  
Pseudomonas Sp ◽  
Tomato Plants

Inoculum density, temperature, and genotype effects on in vitro growth promotion and epiphytic and endophytic colonization of tomato (Lycopersicon esculentum L.) seedlings inoculated with a pseudomonad bacterium

1997 ◽  
Vol 43 (4) ◽  
pp. 354-361 ◽  
Author(s):  
V. K. Pillay ◽  
J. Nowak
Keyword(s):  
Lycopersicon Esculentum ◽  
Plant Growth ◽  
Plant Growth Promotion ◽  
Growth Promotion ◽  
Bacterial Colonization ◽  
Root Surface ◽  
Inoculum Density ◽  
Dual Culture ◽  
Pseudomonas Sp

The effects of inoculum density (0, 4.6 × 107, 4.2 × 108, and 8.8 × 108 cfu∙mL−1), temperature (10, 20, and 30 °C), and plant genotype (cultivars Celebrity, Blazer, Scotia, and Mountain Delight) on bacterial colonization and plant growth promotion were investigated in a gnotobiotic system. An in vitro dual culture of tomato (Lycopersicon esculentum L.) plantlets and a Pseudomonas sp., strain PsJN, were used. Epiphytic (external) and endophytic (internal) bacterial populations were determined to evaluate plantlet colonization. Shoot and root biomass of bacterized plantlets was significantly higher (p ≤ 0.05) than that of nonbacterized controls. Growth promotion was best with inoculum densities of 3 × 108 – 7 × 108 cfu∙mL−1 at 20 °C, particularly in the early maturing cultivars Blazer and Scotia. Lower inoculum densities were required to maximize root growth (approximately 1 × 108 cfu∙mL−1) than shoot growth (approximately 3 × 108 cfu∙mL−1). Shoot surface populations did not vary with inoculum density or temperature, but the bacterium colonized the shoot exterior of cultivars Celebrity, Mountain Delight, and Scotia better than cultivar Blazer. The root surface populations increased linearly with increasing inoculum density (within a range of 107–108 cfu∙mL−1), decreased with increasing temperatures (from 10 to 30 °C), and were higher for the main season cultivar Celebrity than for cultivars Blazer, Scotia, and Mountain Delight. Populations of shoot endophytes did not vary with initial inoculum density or genotype but were affected by temperature; the highest colonization was at 10 °C. The number of root endophytes was also highest at 10 °C at the inoculum density of approximately 4 × 108 cfu∙mL−1 and did not vary with genotypes. The experiments clearly indicate that there was no relationship between root surface colonization and plant growth promotion. However, the range of inoculum levels (3 × 108 – 7 × 108 cfu∙mL−1) that promoted colonization of the inner root tissues (endophytic) also best promoted plant growth. A possible biostimulation threshold within the tissues of the inoculated plants under conditions favourable to the growth of tomato is proposed.Key words: Pseudomonas sp., tomato, colonization, growth promotion.

scholarly journals Exploitation of endophytic Pseudomonas sp. for plant growth promotion and colonization in rice

2017 ◽  
Vol 9 (3) ◽  
pp. 1310-1316
Author(s):  
Gurjot Kaur ◽  
Poonam Sharma ◽  
Deepika Chhabra ◽  
Kailash Chand ◽  
Gurjit Singh Mangat
Keyword(s):  
Plant Growth ◽  
Plant Growth Promotion ◽  
Growth Promotion ◽  
Acc Deaminase ◽  
Pseudomonas Sp ◽  
Bacterial Isolates ◽  
Pgp Traits ◽  
P Solubilization ◽  
Fluorescent Pigment

The present investigation was carried out to exploit bacterial endophytes associated with root and leaf tissue of rice plant for plant growth promotion (PGP) and colonization study in vitro. Total 10 endophytic bacterial isolates (Pseudomonas sp.) were evaluate for PGP traits like P solubilization, production of Indole acetic acid (IAA), siderophore, ACC deaminase, protease, cellulase, fluorescent pigment, urease and denitrification activity. Out of 10 endophytic bacteria 30 %, 60 %, 20 %, 70 %, 10 % and 10 % were positive for siderophore, protease, cellulase, fluorescent pigment, urease and denitrification respectively. Maximum IAA production was recorded with isolate LRBLE7 (18.8 μgml-1) followed by LRBRE4 (16.0 μgml-1) and maximum P-solubilization was recorded with isolate LRBRE4 (5.8 mg 100 ml-1) followed by LRBLE7 (4.4 mg 100 ml-1). ACC deaminase production was recorded with isolate LRBLE6 (O.D=0.352 nm) followed by LRBRE5 (O.D=0.324nm). Three potential isolates (LRBRE4, LRBRE6 and LRBLE7) were selected on the basis of multiple PGP traits and were subjected to colonization study of rice seedling in vitro. Potential bacterial isolates can be exploited for improving growth and productivity in rice under sustainable management system.

Enhanced tomato plant growth in soil under reduced P supply through microbial inoculants and microbiome shifts

2019 ◽  
Vol 95 (9) ◽  
Author(s):  
Namis Eltlbany ◽  
Mohamed Baklawa ◽  
Guo-Chun Ding ◽  
Dinah Nassal ◽  
Nino Weber ◽  
...  
Keyword(s):  
Plant Growth ◽  
Root Growth ◽  
Growth Promotion ◽  
Bacterial Community Composition ◽  
Soil Microbial Communities ◽  
Rrna Gene ◽  
Pseudomonas Sp ◽  
Tomato Plants ◽  
Soil P ◽  
Bacterial Inoculants

ABSTRACT Soil microbial communities interact with roots, affecting plant growth and nutrient acquisition. In the present study, we aimed to decipher the effects of the inoculants Trichoderma harzianum T-22, Pseudomonas sp. DSMZ 13134, Bacillus amyloliquefaciens FZB42 or Pseudomonas sp. RU47 on the rhizosphere microbial community and their beneficial effects on tomato plants grown in moderately low phosphorous soil under greenhouse conditions. We analyzed the plant mass, inoculant colony forming units and rhizosphere communities on 15, 22, 29 and 43 days after sowing. Selective plating showed that the bacterial inoculants had a good rhizocompetence and accelerated shoot and root growth and nutrient accumulation. 16S rRNA gene fingerprints indicated changes in the rhizosphere bacterial community composition. Amplicon sequencing revealed that rhizosphere bacterial communities from plants treated with bacterial inoculants were more similar to each other and distinct from those of the control and the Trichoderma inoculated plants at harvest time, and numerous dynamic taxa were identified. In conclusion, likely both, inoculants and the rhizosphere microbiome shifts, stimulated early plant growth mainly by improved spatial acquisition of available nutrients via root growth promotion. At harvest, all tomato plants were P-deficient, suggesting a limited contribution of inoculants and the microbiome shifts to the solubilization of sparingly soluble soil P.

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