Sacrificial cell death and trichome breakage in an oscillatoriacean blue-green alga: the role of murein

1969 ◽  
Vol 69 (3) ◽  
pp. 237-259 ◽  
Author(s):  
Hayes C. Lamont
Keyword(s):  
Cell Death ◽  
Green Alga ◽  
Blue Green Alga

Parasitism of algae by lignicolous Basidiomycota and other fungi

1997 ◽  
Vol 75 (6) ◽  
pp. 1006-1011 ◽  
Author(s):  
Leonard J. Hutchison ◽  
G. L. Barron
Keyword(s):  
Cell Death ◽  
Key Words ◽  
Green Alga ◽  
Cell Walls ◽  
Wood Decay ◽  
Hyphal Growth ◽  
Synechococcus Elongatus ◽  
Blue Green Alga

On water agar, 30 out of 81 species of fungi tested showed positive directional hyphal growth towards microcolonies of the green alga Protococcus sp. and produced coralloid masses of branched assimilative hyphae within the invaded algal colonies. Of 77 species of fungi tested against the blue-green alga Synechococcus elongatus, 33 exhibited this same phenomenon. Cell walls of S. elongatus were subsequently lysed while only cell death occurred in Protococcus sp., resulting in the release of the contents that were presumably absorbed by the coralloid hyphae. Branched hyphae from some invading fungi occasionally attached to larger individual cells of Protococcus sp., penetrated the walls, and absorbed the contents. Key words: algae, Chlorophyta, Cyanophyta, cyanobacteria, Basidiomycota, wood decay, nitrogen requirements, Protococcus, Synechococcus.

The effect of cold shock on the blue-green alga Anacystis nidulans

1973 ◽  
Vol 19 (3) ◽  
pp. 381-387 ◽  
Author(s):  
E. R. Jansz ◽  
F. I. Maclean
Keyword(s):  
Cell Death ◽  
Green Alga ◽  
Photosynthetic Rate ◽  
Cold Shock ◽  
Anacystis Nidulans ◽  
Blue Green Alga ◽  
Short Term ◽  
And Control

We have investigated the known susceptibility of the blue-green alga Anacystis nidulans to cold shock. After suspensions of the organism were exposed to temperatures of 0°–3° for 15 min, viability was reduced to about 2% and the photosynthetic rate to about one third. Resistance to this effect increased with age of the culture from which the cells were harvested. Polarographic measurements showed that the decline in photosynthesis was complete within a few minutes after removal from the cold, and autoradiography showed that the decline was distributed among all the cells in the suspension. The short-term 14CO2 fixation products in cold-shocked and control cells differed only in amount and the 14CO2 fixed/O2 evolved during photosynthesis was the same in control and cold-shocked cells. Cold shock also caused the loss of some of the diffusible material from the cell; the loss was rapid but did not continue beyond about one quarter of the diffusible C and P; intracellular glutamate was lost to the extent of 50–80%. It is suggested that cold shock affects the limiting membrane of the cell and that this causes cell death but it is uncertain whether it is also responsible for the decline in photosynthesis.

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