On the Water Potential Osmotical Pressure and Velocity of Water Uptake of Dormant Sporangiospores of Phycomyces blakesleeanus

Furch, Bodo

doi:10.1016/s0044-328x(78)80249-9

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…Even our method is likely to yield some overestimation of the water content. This value is quite close to the value recorded by Furch [17] after equilibration of the spores for 24 h in a moist chamber. This water content is quite low, and may perhaps limit metabolism in the dormant spores.…”

Section: Water Uptakesupporting

confidence: 89%

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Resistance of germinatingPhycomycesspores to desiccation, freezing and acids

Laere

1986

FEMS Microbiology Letters

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Phycomyces spores are remarkably resistant to desiccation, freezing and mineral acids, but this resistance gradually disappears during germination. Dehydration resistance decreases much faster in acetate‐activated spores than in heat‐activated spores. This may be related to the more extensive breakdown of trehalose in the former case. The water content of the spores doubles 10–40 min after activation in both cases. This may be related to the rapid loss of frost resistance in both heat‐ activated and acetate‐activated spores. Resistance to HCl, on the other hand, decreases only after 1 h germination, and is not related to any change in water or trehalose content of the spores.

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Section: Water Uptakesupporting

confidence: 89%

“…Although the water content of fully hydrated dormant Phycomyces spores was estimated to be as high as 80% by Furch [17] we found only some 60% after filtering the spores. Even our method is likely to yield some overestimation of the water content.…”

Section: Water Uptakecontrasting

confidence: 64%

Resistance of germinatingPhycomycesspores to desiccation, freezing and acids

Laere

1986

FEMS Microbiology Letters

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“…Although rehydration of the spores after suspension in water occurs in a split second, the water content of spores hydrated in water-saturated air has been reported to be as low as 50% (Verbeke & Van Laere, 1986) to 60% (Furch, 1978). With such low water contents, the availability and/or mobility of water might limit enzymic activity in the spores, especially if the substrates are large molecules (Potthast, 1978).…”

Section: Introductionmentioning

confidence: 99%

Relation between Germination, Trehalose and the Status of Water in Phycomyces blakesleeanus Spores as Measured by Proton-NMR

et al. 1987

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The distribution and properties of the cellular water in sporangiospores of Phycomyces blakesleeanus were investigated using proton-NMR. In dormant spores different classes of water were characterized by a difference in their transverse relaxation times (T2). The amount of cytoplasmic water was estimated to be as low as about 700 mg (g dry wt)-' and its small T2 (1 8.2 ms) indicated a very limited mobility. About 10 min after induction of germination (by a heat shock or by addition of 0.1 M-acetate), both the content and the mobility of the cytoplasmic water increased sharply. These changes coincided with a rapid breakdown of most of the cellular trehalose and with the production (and leakage from the spores) of large amounts of glycerol. The role of these biochemical changes is discussed in relation to the water status of the spores.

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The role of water in the activation ofPhycomyces blakesleeanus sporangiospores

Verbeke

Laere

1986

Experimental Mycology

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On the Water Potential Osmotical Pressure and Velocity of Water Uptake of Dormant Sporangiospores of Phycomyces blakesleeanus

Cited by 5 publications

References 7 publications

Resistance of germinatingPhycomycesspores to desiccation, freezing and acids

Resistance of germinatingPhycomycesspores to desiccation, freezing and acids

Relation between Germination, Trehalose and the Status of Water in Phycomyces blakesleeanus Spores as Measured by Proton-NMR

The role of water in the activation ofPhycomyces blakesleeanus sporangiospores

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