Tryptophanabbau zu Indolessigs�ure durch pflanzenbesiedelnde Mikroorganismen

Libbert, Eike; Wichner, Siegfried

doi:10.1007/bf00601608

Cited by 16 publications

(3 citation statements)

References 4 publications

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“…Caffeic acid and tryptophan interacted to promote root formation on detached bean leaves (Gorter, 1969). This auxin could also be produced by the effect of epiphytic bacteria on the plants (Libbert and Wichner, 1963). My experiments were not done in sterile conditions, which are not usual during rooting of cuttings.…”

Section: Discussionmentioning

confidence: 99%

Auxins and cytokinins exuded during formation of roots by detached primary leaves and stems of dwarf French bean (Phaseolus vulgaris L.)

1971

Planta

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Hypocotyls of detached stems standing in culture solution produced adventitious roots sooner than did petioles of detached primary leaves. An auxin, probably indol-3-ylacetic acid, appeared in the solutions before the hypocotyls or petioles produced roots. After attaining a maximum, the amounts of auxin in the solutions decreased as fewer roots were formed. Two cytokinins were found in the culture solutions; one had a similar Rf to zeatin, the other ran more slowly on chromatograms. The amounts of cytokinin in the solutions were associated with root formation. Stems soon died unless their hypocotyls formed roots, but the primary leaves survived without roots forming provided a callus formed on the petiole. Hence adventitious roots, or callus tissues, may have produced cytokinins that replaced those produced by the original roots, found in sap exuded from the stem stumps, and were essential for survival of the stems and leaves.

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Section: Discussionmentioning

confidence: 99%

Auxins and cytokinins exuded during formation of roots by detached primary leaves and stems of dwarf French bean (Phaseolus vulgaris L.)

1971

Planta

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“…Research work on the auxin content of liigher planls is usually done with nonslerile plant material. However, nonsterile plant parts are covered with epiphytic bacteria able to produce IAA from tryplophan (Libbert and Wichner 1963, Libbert et al 1966, Risch 1967, Wichner and Libbert 1968. Therefore the auxin amounts extractable from nonsterile plant material possibly partially originate from bacteria.…”

Section: Introductionmentioning

confidence: 99%

Interactions between Plants and Epiphytic Bacteria Regarding Their Auxin Metaholism

Wichner

1968

Physiologia Plantarum

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During an ether extraction (20 h, 4'^C), nonsterilc pea epicotyls dehver at lea.st 5 times more auxin than sterile ones. A great part of the additional auxin originates from a bacterial auxin production during the extraction. Presence of chloramphenicol or streptomycin during the extraction lowers the auxin amount extractable from nonsterile epicotyls. In extraction conditions (i.e. covered with ether, 20 h, 4 C), epiphytic bacteria contained in homogenates of nonsterile plant parts produce IAA from added tryptophan.Furthermore, first results are presented underlining the fact that epiphytic bacteria already produce auxin at the surface of nonsterile plant parts (before an extraction). Physiol. Plant., 21. lOOS [1356]

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“…Libbert and co-workers reported that such bacteria are responsible for the indoleacetic acid formed from tryptophan in incubation mixtures, including plant tissue from pea seedlings and a variety of other plant tissue (22,23). Large populations of Bacillus subtilis have been associated with phosphorus toxicity in soybeans (9).…”

Section: Discussionmentioning

confidence: 99%

Curtobacterium plantarum sp. nov. Is Ubiquitous in Plant Leaves and Is Seed Transmitted in Soybean and Corn

Dunleavy

1989

International Journal of Systematic Bacteriology

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A total of 22 strains of a yellow-pigmented bacterium which I designated YB, which were isolated from leaves of various plants, were compared with the type strains of Curtobacterium citreum, Curtobacterium albidum, Curtobacterium luteum, and Curtobacterium pusillum and six strains of Curtobacterium jlaccumfaciens, a pathogen of soybeans and garden beans. These species comprise the genus Curtobacterium. YB was nonpathogenic when it was inoculated onto leaves of soybeans and garden beans and produced p-carotene, as did both C. citreum and C . luteum. These species and YB were all originally isolated from plants. YB could be distinguished from all previously described species of the genus Curtobacterium on the basis of more rapid production of acid from maltose and xylose, more rapid hydrolysis of gelatin, susceptibility to bacteriophage PYB-3 infection, inability to hydrolyze hippurate, growth in the presence of 10% sodium chloride, and higher deoxyribonucleic acid guanine-plus-cytosine content. Because the YB strains represent a new center of variation in the genus Curtobacterium, a new species, Curtobacterium plantarum, is proposed. This bacterium was isolated from leaves of three soybean cultivars at weekly intervals. Mean populations, expressed in colony-forming units (CFU) per gram of leaf tissue, increased gradually over the season from 28 CFU/g at 5 weeks after planting to 158 CFU/g at plant maturity. The bacterium was also isolated from leaves of 10 soybean cultivars and 10 corn inbred lines in each of 3 years, from leaves in one soybean field and one corn field in each of 25 Iowa counties, and from leaves of each of 100 soybean plants from one field and 100 corn plants from one field. Over a 2-year period, it was isolated from all 200 plant species sampled. The samples represented 62 plant families and included trees (both broad leaved, and conifers), shrubs, annuals, and perennials. The bacterium was isolated from field-grown immature and mature soybean seeds and from leaves of soybean and corn seedlings grown in a microbe-free environment from seeds treated to eliminate external microorganisms. I concluded that C. plantarum sp. nov. is seed transmitted in soybeans and corn and is ubiquitous in the leaves of plants.From 1881, when T. J. Burrill first established that Erwinia amylovora (Burrill) Winslow, Broadhurst, Buchanan, Krumwiede, Rogers and Smith is the cause of fire blight of apples and pears, the following two groups of plant-associated bacteria have been recognized: the pathogens, which invade plant tissues and produce disease, and the saprophytes, which utilize leaf and root surfaces as substrates but cause no disease. While isolating Curtobacterium Jlaccumfaciens pv. Jaccumfaciens (Hedges) Collins and Jones, which is pathogenic for leaves of soybeans (GIycine max [L.] Merr.) and garden beans (Phaseolus vulgaris L.), I consistently observed colonies of another yellow-pigmented bacterium that I designated YB (yellow-pigmented bacterium). YB was associated with other plants, such as corn, oats, a...

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Tryptophanabbau zu Indolessigs�ure durch pflanzenbesiedelnde Mikroorganismen

Cited by 16 publications

References 4 publications

Auxins and cytokinins exuded during formation of roots by detached primary leaves and stems of dwarf French bean (Phaseolus vulgaris L.)

Auxins and cytokinins exuded during formation of roots by detached primary leaves and stems of dwarf French bean (Phaseolus vulgaris L.)

Interactions between Plants and Epiphytic Bacteria Regarding Their Auxin Metaholism

Curtobacterium plantarum sp. nov. Is Ubiquitous in Plant Leaves and Is Seed Transmitted in Soybean and Corn

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