Entwicklungsphysiologie der Moose

Bopp, Martin

doi:10.1007/978-3-642-50088-6_27

Cited by 6 publications

(6 citation statements)

References 116 publications

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“…Lack of phosphate or nitrate enhances formation of cells with oblique cross walls, caulonema and rhizoids (Schoene, 1906), whereas lack of calcium leads to inhibition of caulonema formation. Thus, caulonema formation appears to be a response to a deficiency that needs calcium gradients to be established (Bopp, 1981). In Ceratodon, both protonemal cell types, chloronema and caulonema, show a positive phototropic response mediated by phytochrome and intracellular Ca2+-gradients (Hartmann et al, 1983).…”

Section: Caulonemamentioning

confidence: 99%

“…Subsequently, it has been shown that bud induction is a specific cytokinin-effect in several mosses, mainly using "potent" but artificial cytokinins (Bopp, 1963;Brandes, 1967;Hahn and Bopp, 1968). From these studies it has been suggested that only caulonema cells react by budding (Bopp, 1981) and that they may be specific target cells for cytokinin action because they have cytokinin-binding proteins which are not present in chloronema cells (Erichsen et aI., 1977). However, 6-(,12-isopentenyl)adenine ([P), the main native cytokinin of mosses, induced budding on chloronemata and on caulonernata of Physcomitrella and Funaria in a specific manner.…”

Section: Budsmentioning

confidence: 99%

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Development, Genetics and Molecular Biology of Mosses

1998

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The first descriptions of sex chromosomes in plants, of the continuity of chromosomes during the mitotic cycle and of non‐Mendelian inheritance as well as the introduction of UV‐mutagenesis to genetic research are landmarks in biological sciences first achieved by scientists working on bryophytes. Haploidy of the tissue facilitates mutant isolation and many developmental moss mutants have been isolated. Early moss development is triggered by auxin, by cytokinin and by light, mainly acting via phytochrome and a blue‐light receptor. Due to the simplicity of the plants, development can be pinpointed to the differentiation of a single cell and be analysed in living tissue, making mosses ideal candidates for the analysis of development in an integrated approach of cell and molecular biology. Molecular genetic techniques have been applied mainly to Physcomitrella patens (Hedw.) B.S.G., where efficient protocols for transformation of nuclear DNA have been established and several nuclear, chloroplast and mitochondrial genes have been analysed. These studies reveal that Physcomitrella may be an appropriate model to study plant development in molecular terms. Recently, it has been shown that, in this species, nuclear genes can be targeted very efficiently by homologous recombination, now opening the door to reverse genetics for plant biologists.

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Section: Caulonemamentioning

confidence: 99%

Section: Budsmentioning

confidence: 99%

Development, Genetics and Molecular Biology of Mosses

1998

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“…For living material the phase contrast microscope permits the study of individual stages of dedifferentiation. Both qualitative information, as in the study of differentiation in Funaria protonema (Bopp, 1965). and quantitative information.…”

Section: Phase Contrast Microscopymentioning

confidence: 99%

Modern methods in the investigation of bryophyte morphology

Sarafis

1971

New Zealand Journal of Botany

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“…Ethylene released by setae increases during growth from 0.027 to 0.035 nanoliter per seta per hour. Application of 5 microliters per liter ethylene inhibits auxinstimulated elongation growth of this tissue, a result which suggests that both endogenously produced compounds act in tandem as natural growth modulators.Morphogenetic processes in bryophytes appear to be regulated by hormones that are quite similar to those found in higher plants (3,14). This conclusion is based largely upon the interpretation of morphologic responses to exogenously applied growth regulators.…”

mentioning

confidence: 94%

“…Morphogenetic processes in bryophytes appear to be regulated by hormones that are quite similar to those found in higher plants (3,14). This conclusion is based largely upon the interpretation of morphologic responses to exogenously applied growth regulators.…”

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Endogenous Auxin and Ethylene in Pellia (Bryophyta)

Thomas¹,

Harrison²,

Taylor³

et al. 1983

Plant Physiol.

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The occurrence of endogenous indole-3-acetic acid and ethylene in bryophyte tissue was tentatively demonstrated using gas chromatography, high performance liquid chromatography, and double-standard isotope dilution techniques. Rapidly elongating stalks (or setae) of Pellia epiphylla (L.) Corda sporophytes contain approximately 2.5 to 2.9 micrograms per gram fresh weight of putative free IAA. Ethylene released by setae increases during growth from 0.027 to 0.035 nanoliter per seta per hour. Application of 5 microliters per liter ethylene inhibits auxinstimulated elongation growth of this tissue, a result which suggests that both endogenously produced compounds act in tandem as natural growth modulators.Morphogenetic processes in bryophytes appear to be regulated by hormones that are quite similar to those found in higher plants (3,14). This conclusion is based largely upon the interpretation of morphologic responses to exogenously applied growth regulators. Very few studies have been directed toward isolation and identification of endogenously produced hormones in these plants. Two well-documented exceptions are the chemical characterization of cytokinin from cultured mosses (2,24), and the identification ofa bibenzyl compound that apparently substitutes for ABA in liverworts (9,17,23). Less convincing experimental evidence exists for the endogenous occurrence of auxin in bryophyte tissues (13,18). Criticism (21) has been directed especially toward the adequacy of ethanolic extraction and paper chromatographic purification techniques used until now for characterization, by bioassay, of the trace amounts detected. Ethylene released by Marchantia thalli, on the other hand, is readily detected with modern gas chromatographic techniques (6). The response of thalli and other liverwort tissues to this hormone, however, remain almost completely unknown.The object of this paper is to present further evidence for the occurrence of endogenous free auxin in bryophytes using a modified Bandurski extraction method (1) and a double-standard isotope dilution assay (4). The seta of Pellia sporophytes was selected as experimental material because of its high sensitivity to exogenously applied auxin (1 1, 20, 22). Seta tissue was also used to measure endogenous ethylene production and to test for growth sensitivity to exogenously applied ethylene. C2M4 Measurements. One to two hundred whole seta segments (excised as described above) were placed in a 5-ml vial sealed with a serum septum. Vacuum was then applied by three 10-cc syringes with plungers held out for 4 min, after which the syringes were released and removed. After 15 min, a l-ml air sample was analyzed for C2H4 by flame ionization chromatography (10).IAA Extraction. Excised setae (20-35 g) were extracted by homogenization in 80% acetone as described by Bandurski and coworkers (1,16

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Entwicklungsphysiologie der Moose

Cited by 6 publications

References 116 publications

Development, Genetics and Molecular Biology of Mosses

Development, Genetics and Molecular Biology of Mosses

Modern methods in the investigation of bryophyte morphology

Endogenous Auxin and Ethylene in Pellia (Bryophyta)

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