The spermosphere model. I. Its use in growing, counting, and isolating N<sub>2</sub>-fixing bacteria from the rhizosphere of rice

Thomas-Bauzon, Danièle; Weinhard, P.; Villecourt, P; Balandreau, J.

doi:10.1139/m82-139

Cited by 108 publications

(38 citation statements)

References 13 publications

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“…Shoot elongation was also increased through (Ela et al, 1982; Thomas-Bauzon et al, 1982) or phytohormone production (Zimmer and Böthe, 1989 (Fages, 1990) and the methodology of field application is therefore very important and must allow a good root colonization at the beginning of plant growth. These methods are under current investigation in our laboratory.…”

Section: Effect Of Bacterial Concentrationmentioning

confidence: 99%

Growth enhancement of maize (Zea mays L) through Azospirillum lipoferum inoculation : effect of plant genotype and bacterial concentration

Arsac¹,

Lamothe²,

Mulard³

et al. 1990

Agronomie

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Section: Effect Of Bacterial Concentrationmentioning

confidence: 99%

Growth enhancement of maize (Zea mays L) through Azospirillum lipoferum inoculation : effect of plant genotype and bacterial concentration

Arsac¹,

Lamothe²,

Mulard³

et al. 1990

Agronomie

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“…They did not produce acid from dulciol, adonitol, and inulin. Klebsiella oxytoca and E. cloacae are the common nitrogen-fixing bacteria associated with a number of rice varieties (12,13,15,52,53). A nitrogen-fixing E. herbicola strain was isolated from water and a compost of paper mill process (54), and it was found in strains preserved at the Centers for Disease Control (CDC) (Atlanta, Georgia, U.S.A.) (55).…”

Section: Erwinia Herbicola (Lohnis 1911) Dye 1964mentioning

confidence: 99%

“…Recently nitrogen-fixing P. paucimobilis was isolated from rice (12,13), Deschampsia caespitosa (62), and soil (63). The acetylene reduction activity of the type strain of P. paucimobilis KM 2395T was tested but no activity was found.…”

Section: Tatmentioning

confidence: 99%

Isolation of free-living nitrogen-fixing bacteria from the rhizosphere of rice.

Oyaizu-Masuchi

Komagata

1988

J. Gen. Appl. Microbiol.

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Bacterial flora of rhizosphere of the rice plant was examined to determine the relationship of nitrogen-fixing bacteria to rice plants. Of 7,344 bacterial strains from the rhizosphere, 1,005 strains (13.7%) reduced acetylene. Representative 74 strains with acetylene reduction activity were selected for identification. All of these strains were gram negative, aerobic or facultatively anaerobic, and most had ubiquinone (Q-10) and cellular fatty acid composition, mainly with straight-chain fatty acids. Twenty-two strains were assigned to the following known species: Azospirillum brasilense Tarrand, Krieg and Dobereiner (1 strain), Azospirillum lipoferum Tarrand, Krieg and Dobereiner (1 strain), Enterobacter cloacae (Jordon) Hormaeche and Edwards (4 strains), Erwinia herbicola (Lohnis) Dye (2 strains), Klebsiella oxytoca (Flugge) Lautrop (6 strains), and Xanthobacter autotrophicus (Baumgarten, Reh and Schlegel) Wiegel, Wilke, Baumgarten, Opitz and Schlegel (8 strains). Fifty-two strains could not be assigned to any known species.Since YOSHIDA and ANCAJAS (1) reported the association of free-living nitrogen-fixing bacteria with rice plants, several workers have isolated such bacteria and investigated the interrelation between bacteria and rice (2-17). Until recently, Azospirillum lipoferum (11-14), Azospirillium brasilense (12-14), Enterobacter cloacae (12,13,15), Klebsiella oxytoca (12, 13), Pseudomonas paucimobilis (12, 13), Pseudomonas sp. (16,17), and Clostridium sp. (5) have been isolated. SANO et al. (18) reported a seasonal variation of nitrogen-fixation in the rice plant and a possible symbiotic relation between bacteria and the plants. We have collaborated with them to investigate the relation between the nitrogen-fixing bacteria and the rice plant. This paper deals with the characterization and identification of the free-living nitrogen-fixing bacteria isolated from rice roots and paddy soil.

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“…A. lipoferum strain 4T was isolated from the rice rhizosphere [2]. Compared to typical A. lipoferum isolates [3], the 4T strain was non-motile and unable to acidify media containing certain sugars.…”

Section: Introductionmentioning

confidence: 96%

Emergence of a laccase-positive variant of Azospirillum lipoferum occurs via a two-step phenotypic switching process

Alexandre

1999

FEMS Microbiology Letters

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Two variants have been isolated from the wild-type Azospirillum lipoferum strain 4B. The first variant, 4V s , spontaneously emerged from the wild-type at frequencies in the order of 10 3R to 10 3Q per cell generation. Compared to the wild-type, the 4V s variant gained (production of a carotenoid-like pigment, assimilation of certain carbohydrates) and lost (swimming motility, reduction of triphenyl tetrazolium chloride, acid production from certain sugars) apparently unrelated phenotypic characteristics. Only from the 4V s variant, a second atypical stable form, variant 4V ss , which acquired laccase activity and ability to produce melanin, appeared under very specific conditions, namely growth at extremely low oxygen concentrations. Neither of the variants was able to revert to the parental phenotype. The results suggest that atypical non-motile laccasepositive isolates of A. lipoferum that are found in the rice rhizosphere originate from wild-type (motile, laccase-negative) cells via a two-step phenotypic switching event, a non-motile laccase-negative variant being an intermediate phase. z 1999 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.

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The spermosphere model. I. Its use in growing, counting, and isolating N₂-fixing bacteria from the rhizosphere of rice

Cited by 108 publications

References 13 publications

Growth enhancement of maize (Zea mays L) through Azospirillum lipoferum inoculation : effect of plant genotype and bacterial concentration

Growth enhancement of maize (Zea mays L) through Azospirillum lipoferum inoculation : effect of plant genotype and bacterial concentration

Isolation of free-living nitrogen-fixing bacteria from the rhizosphere of rice.

Emergence of a laccase-positive variant of Azospirillum lipoferum occurs via a two-step phenotypic switching process

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The spermosphere model. I. Its use in growing, counting, and isolating N2-fixing bacteria from the rhizosphere of rice

Cited by 108 publications

References 13 publications

Growth enhancement of maize (Zea mays L) through Azospirillum lipoferum inoculation : effect of plant genotype and bacterial concentration

Growth enhancement of maize (Zea mays L) through Azospirillum lipoferum inoculation : effect of plant genotype and bacterial concentration

Isolation of free-living nitrogen-fixing bacteria from the rhizosphere of rice.

Emergence of a laccase-positive variant of Azospirillum lipoferum occurs via a two-step phenotypic switching process

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The spermosphere model. I. Its use in growing, counting, and isolating N₂-fixing bacteria from the rhizosphere of rice