The ethylene action in the development of cellular slime molds: an analogy to higher plants

Amagai, Aiko; Maeda, Yasuo

doi:10.1007/bf01403379

Cited by 29 publications

(18 citation statements)

References 22 publications

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“…This pathway is uncommon in microorganisms. It has been described in the slime mould Dictyostelium mucoroides [5] and only recently in the fungus Penicillium citrinum [6]. Two additional biosynthetic pathways have been described in bacteria and fungi.…”

Section: Introductionmentioning

confidence: 99%

Ethylene biosynthesis in Botrytis cinerea

Chagué

Elad

Barakat

et al. 2002

FEMS Microbiology Ecology

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Ethylene is often released during plant pathogenesis. Enhanced ethylene biosynthesis by the attacked plant, and formation of ethylene by the attacking pathogen may be involved. We defined the biosynthetic pathway of ethylene in the pathogenic fungus Botrytis cinerea, and characterized the conditions that affect ethylene production in vitro. During the first 48 h of culture the fungus uses methionine to produce alpha-keto gamma-methylthiobutyric acid (KMBA) and secretes it to the medium. In darkness, KMBA accumulates in the medium. In light KMBA is photo-oxidized and ethylene is released. The photo-oxidation reaction is spontaneous and does not involve any enzymatic activity. Low levels of ethylene are produced in darkness between 48 and 96 h of culture. Adding peroxidase to dark-grown cultures induced ethylene formation. The results suggest that formation and secretion of KMBA by B. cinerea may affect ethylene levels during plant infection.

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Section: Introductionmentioning

confidence: 99%

Ethylene biosynthesis in Botrytis cinerea

Chagué

Elad

Barakat

et al. 2002

FEMS Microbiology Ecology

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“…The inhibition of macrocyst formation by ethionine was found to vary in efficiency depending on the cell densities at the time-point of starvation, as the case for Dm7 (7). In this connection, it is possible that the amount of methionine in growth medium might be lowered by being incorporatedup into cells in response to the increase of cell density, thus giving more striking inhibition of macrocyst formation by ethionine.…”

Section: Discussionmentioning

confidence: 93%

“…It has been shown that ethionine inhibits the sexual process (macrocyst formation) in MFl, and its inhibitory effect is cancelled by the addition of methionine (14). The ethionine effect is also cancelled by the addition of SAM, ACC, or ethylene (7), thus indicating that ethionine inhibits macrocyst formation by lowering ethylene production. In the present work, ethionine and ACC were used to examine whether ethylene is implicated for the heterothallic and homothallic macrocyst formation in Dd.…”

Section: Discussionmentioning

confidence: 99%

“…1). The inhibitory effect of ethionine varied in efficiency depending on the cell densities at the time-point of starvation, as the case for Dm7 cells (7). When cells growing in the presence of 4.8 mM ethionine were harvested at a relatively low density below 1.3 x 1 O6 cells/ml, ethionine had no effect and macrocysts were always formed (inhibition, 0%).…”

Section: Effect Of Ethionine On Macrocyst Formation In Heterothallic mentioning

confidence: 99%

“…Ethionine, an analogue of methionine, inhibits macrocyst formation, and its inhibitory effect of ethionine on macrocyst formation is almost completely cancelled by the addition of S-adenosyl methionine (SAM), 1 -aminocyclopropane-1 -carboxylic acid (ACC), the precursors for ethylene biosynthesis or ethylene (3). Based on these results, it has been suggested that ethionine inhibits macrocyst formation by decreasing ethylene production (7). There are homothallic and heterothallic strains in the cellular slime molds with respect to macrocyst formation (1 1, 12, 15).…”

Section: Introductionmentioning

confidence: 99%

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Induction of Heterothallic and Homothallic Zygotes in Dictyostelium discoideum by Ethylene

Amagai

1992

Dev Growth Differ

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Dictyosteliurn rnucoroides-7 (Dm7) and a mutant (MFI) derived from it exhibit homothallic macrocyst formation in the sexual process. As previously shown, the zygote formation during macrocyst formation is induced by a potent plant hormone, ethylene. The present work was undertaken to know if ethylene is also involved in heterothallic and homothallic macrocyst formation in D. discoideurn. In heterothallic macrocyst formation between NC4 and V12M2 cells, ethionine, an analogue of methionine, inhibits macrocyst formation through arresting specifically the acquisition process of fusion competence. Such an inhibitory effect of ethionine was almost completely cancelled by co-application of ACC (1 -aminocyclopropane-1 -carboxylic acid), the immediate precursor of ethylene. Essentially the same effects of ethionine and ACC were also noticed on homothallic macrocyst formation in D. discoideurnAC4. Thus it seems most likely that ethylene is required for the acquisition of fusion competence during macrocyst formation, and that in a variety of strains examined there is a common mechanism regulated by ethylene, beyond the difference of sexual modes.

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Ethylene Receptors in Nonplant Species

2019

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The effects of ethylene and ethylene signal transduction have been long studied in plants. It was only recently reported that a single-celled cyanobacterium, Synechocystis, contains a functional ethylene receptor. However, it remains to be determined if functional ethylene receptors are more widespread. This review summarizes what is known about responses to ethylene, ethylene receptors, and signal transduction in non-plant species. A summary is provided of information gleaned from searches of sequenced genomes and the possibility that ethylene receptors are widespread in microbes is discussed.

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The ethylene action in the development of cellular slime molds: an analogy to higher plants

Cited by 29 publications

References 22 publications

Ethylene biosynthesis in Botrytis cinerea

Ethylene biosynthesis in Botrytis cinerea

Induction of Heterothallic and Homothallic Zygotes in Dictyostelium discoideum by Ethylene

Ethylene Receptors in Nonplant Species

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