Similar Effects on Tomato Plants of Azotobacter Inoculation and Application of Gibberellins

Jackson, R. M.; Brown, Michael; Burlingham, Susan K.

doi:10.1038/203851a0

Cited by 36 publications

(9 citation statements)

References 8 publications

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“…Rempe and Kaltagova (1985) showed that activities of some root enzymes and the chlorophyll contents of the shoots increased when rhizosphere microorganisms were present, and the sap from non‐sterile plants had higher free amino acid contents. In other studies, Rovira (1963) found that rhizosphere microorganisms cause wheat to produce seeds earlier, whereas Jackson et al. (1984) reported early flowering and ripening in tomatoes.…”

Section: Importance Of Rhizosphere Modificationsmentioning

confidence: 96%

Ecophysiology of the Plant–Rhizosphere System

El-Shatnawi

Makhadmeh

2001

J Agronomy Crop Science

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The rhizosphere is the site of organic deposition and the generator of habitat and resource heterogeneity for soil organisms. Plants can modify their rhizosphere through nutrient, moisture and O2 uptake from the rhizosphere, rhizo‐deposition and production of root exudates. As a result, rhizosphere chemical (pH, nutrient solubility, O2, CO2 and other chemicals), physical (moisture and aeration), and biological (soil pathogens, beneficial microorganisms and allelopathy) characteristics will be changed or modified. Rhizosphere microorganisms have positive or negative effects on plant growth and morphology by affecting the plant hormone balance, plant enzymatic activity, nutrient availability and toxicity, and competition with other plants. Plants modify the rhizosphere and as a result will modify the community.

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Section: Importance Of Rhizosphere Modificationsmentioning

confidence: 96%

Ecophysiology of the Plant–Rhizosphere System

El-Shatnawi

Makhadmeh

2001

J Agronomy Crop Science

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“…At 28, 35, and 42 days, inoculated plants were significantly larger than the uninoeulated controls. Inoculating tomatoes with Azotobacter chroococcum produced efIects resembling ttlose described by J a c k s o n et al 12 i.e. the stem and leaf growth was accelerated during the first few weeks of plant growth.…”

Section: E//ects O/ Azotobacter Inoculation On Plantsmentioning

confidence: 77%

Micro-organisms in the rhizosphere of plants inoculated withAzotobacter chroococcum

Patel

1969

Plant Soil

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Part of a thesis accepted by the University of London for the degree of Ph.D. in Microbiology.--209 --210 j.j. PATEL Irom the soil near its roots and is subject to attack by root parasites, the microbial activities in the rtfizosphere are clearly important in influencing plant growth. This paper compares the micro-organisms of the rhizosphere and also the root-surface fungi of wheat and tomato plants inoculated with Azotobacter chroococcum with those of uninoculated plants. MATERIALS AND METHODS Solls and [ertilizersTwo soils were used:(1) Clay loam with fiints from Great Field, Rothamstd (carbon content 3.5% of air-dry soil, pH 5.8).(2) Compost mixture containing 6 patts loam from Kettering, Northamptonshire, 3 patts peat and 2 parts of sand. Agricultural chalk was added to both soils to bring the pH to 7.0-7.2. Neither soll contained Azotobacter.Pots containing clay loam were each given 85 mg N, 16 mg P, and 50 mg K (per Kg of soil) as NaNOa, Ca(HzPO4)2 and K2SO4 respectively. A bushel of compost mixture was given a basal dressing of ¼ lb of superphosphate and potash, in experiments where plants were grown for more than four weeks, 50 mg N, 10 mg P and 30 mg K per pot were given every 2 weeks. Plant culture and gradingPlants were grown in the glasshouse with a day temperature of 20-22°C and night temperature of 16-18°C. Seedling plants were grown singly in pots of 200 g capacity; in experiments requiring plants older than four weeks 600-g-capaeity pots were used. The pots were watered from below by capillarity. During the winter plants received supplementary light to give them an 18-h day.Wheat (Jury 1) plants were visually graded at 8-10 day intervals to assess the general development. For this four plants, the smallest, the largest and two of intermediate size were taken from the experimental plants for use as standards and given seores of 2, 4, 6, and 8 respectively, with which plants were compared and given appropriate scores. Leaf length and height of the tomato plants (Money Maker) were measured at weekly intervals; the dry weight of stems and leaves was also obtained at the time of sampling. Azotobacter culture and methods o/inoculationAzotobacter chroococcum Strain A 6 a local isolate from Rothamsted Garden plot was grown in liquid medium (K2HPO4, 0.8 g; MgSO4.7FI20, 0.04g; Na2MoO4, 0.005 g; FeSO4.7H20, 0.04 g; CaCO3, 2,0 g; sucrose, 5.0g; and distilled water 1,000 ml; pH 7.2-7.4, 100 ml quantities autoclaved in 500 ml flasks at 121°C for 15 min) Oll a rotary shaker at 26°C for 14 days. The viable cells iI1 batches of cultures ranged from 4-9 x 108 cells/ml.

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“…Zúñiga y Gutiérrez-Correa (1982), observaron efectos similares en poblaciones de diazótrofos sobre plantas de Sycius baderoa, los exudados radiculares estarían ejerciendo una influencia primordial sobre los diazótrofos. Por lo tanto, Azotobacter actuaría sobre el crecimiento de las plantas al fijar N 2 , producir reguladores del crecimiento en la rizósfera y ser antagonista de organismos patógenos (Jackson et al, 1964).…”

Section: Efecto Del Fosforo Sobre La Poblacion Microbiana En Suelos Dunclassified

Efecto Del Fosforo Sobre La Poblacion Microbiana en Suelos Con Pasturas en La Zona Altoandina De Junin

Hernandez

Zúñiga-Dávila

2016

Ecol. apl.

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ResumenSe evaluó el efecto de la fertilización fosforada (80 Kg P 2 O 5 /ha) sobre la población microbiana del suelo y la producción de materia seca en la pastura asociada Rye-grass/trébol (Lolium perenne / Trifolium repens y Trifolium pratense) en zona altoandina del Perú. Se encontró que la población de bacterias mesófilas, hongos, Rhizobium y Azotobacter fueron mayores en el tratamiento con fósforo en comparación con el tratamiento sin fósforo. Las más bajas poblaciones de todos los microorganismos en estudio se observaron en los meses de Mayo y Julio, meses en los que se registraron las temperaturas del suelo más bajas, y las poblaciones más altas en los meses de Enero y Noviembre. Los pesos secos (PST, PS trébol, PS rye-grass) fueron significativamente mayores en el tratamiento con fósforo. Además se observó que el trébol respondió mejor a la fertilización que el Rye-grass. Los más altos rendimientos de materia seca del trébol y rye-grass corresponden a las más altas poblaciones de Rhizobium y Azotobacter respectivamente. Esto sugiere que la fijación biológica del N 2 favorece el crecimiento de la pastura. Palabras claves: Rizósfera, Rhizobium, Azotobacter, trébol, fósforo. AbstractA study was conducted to investigate the phosphorus fertilization effect (80 Kg P 2 O 5 /ha) on the microbial population and the total dry matter weight (DW) of Rye-grass/Clover associated pasture (Lolium perenne / Trifolium repens and Trifolium pratense) in highlands of Peru. The results showed that mezophile bacteria, fungi, Rhizobium y Azotobacter populations were higher in the phosphorus treatment compared with the non-phosphorus treatment. The lowest microbial population levels were between May and July. These months registered the lowest soil temperatures. The highest microbial population levels were obtained in January and November The dry matter weight (total WD, Clover WD, Rye-grass WD) were highly significant in the phosphorous treatment. Moreover, better fertilization answers were established for Clover than for Rye-grass. The highest yields of Clover and Rye-grass dry matter weight have a positive correlation with the highest Rhizobium -Azotobacter populations respectively. This suggests that nitrogen biological fixation improve the growth of the pasture.

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Similar Effects on Tomato Plants of Azotobacter Inoculation and Application of Gibberellins

Cited by 36 publications

References 8 publications

Ecophysiology of the Plant–Rhizosphere System

Ecophysiology of the Plant–Rhizosphere System

Micro-organisms in the rhizosphere of plants inoculated withAzotobacter chroococcum

Efecto Del Fosforo Sobre La Poblacion Microbiana en Suelos Con Pasturas en La Zona Altoandina De Junin

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