Chitin synthetase mutants of Phycomyces blakesleeanus

1993 ◽  
Vol 240 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Beatriz Cubero ◽  
José Ruiz-Herrera ◽  
Enrique Cerdá-Olmedo
Keyword(s):  
Phycomyces Blakesleeanus ◽  
Chitin Synthetase

Chitin synthetase activity in a developmental mutant of Phycomyces blakesleeanus

1990 ◽  
Vol 58 (2) ◽  
pp. 67-72 ◽  
Author(s):  
E. Ruiz-Flores ◽  
E. Lopez-Romero ◽  
F. Gutierrez-Corona
Keyword(s):  
Synthetase Activity ◽  
Phycomyces Blakesleeanus ◽  
Chitin Synthetase ◽  
Developmental Mutant

scholarly journals Intersexual Partial Diploids of Phycomyces

Genetics ◽  
2001 ◽  
Vol 158 (2) ◽  
pp. 635-641
Author(s):  
Bina J Mehta ◽  
Enrique Cerdá-Olmedo
Keyword(s):  
Dry Mass ◽  
Sexual Cycle ◽  
Genetic Constitution ◽  
Phycomyces Blakesleeanus ◽  
Carotene Content ◽  
Sexual Interaction ◽  
Sexual Stimulation ◽  
Nuclear Composition ◽  
Opposite Sex ◽  
Β Carotene

Abstract Sexual interaction between strains of opposite sex in many fungi of the order Mucorales modifies hyphal morphology and increases the carotene content. The progeny of crosses of Phycomyces blakesleeanus usually include a small proportion of anomalous segregants that show these signs of sexual stimulation without a partner. We have analyzed the genetic constitution of such segregants from crosses that involved a carF mutation for overaccumulation of β-carotene and other markers. The new strains were diploids or partial diploids heterozygous for the sex markers. Diploidy was unknown in this fungus and in the Zygomycetes. Random chromosome losses during the vegetative growth of the diploid led to heterokaryosis in the coenocytic mycelia and eventually to sectors of various tints and mating behavior. The changes in the nuclear composition of the mycelia could be followed by selecting for individual nuclei. The results impose a reinterpretation of the sexual cycle of Phycomyces. Some of the intersexual strains that carried the carF mutation contained 25 mg β-carotene per gram of dry mass and were sufficiently stable for practical use in carotene production.

scholarly journals Helical growth during the phototropic response, avoidance response, and in stiff mutants of Phycomyces blakesleeanus

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Joseph K. E. Ortega ◽  
Revathi P. Mohan ◽  
Cindy M. Munoz ◽  
Shankar Lalitha Sridhar ◽  
Franck J. Vernerey
Keyword(s):  
Avoidance Response ◽  
Experimental Results ◽  
Sensory Transduction ◽  
Growth Responses ◽  
Phycomyces Blakesleeanus ◽  
Sensory Stimuli ◽  
Phototropic Response ◽  
Biophysical Models ◽  
Helical Growth ◽  
Made In

AbstractThe sporangiophores of Phycomyces blakesleeanus have been used as a model system to study sensory transduction, helical growth, and to establish global biophysical equations for expansive growth of walled cells. More recently, local statistical biophysical models of the cell wall are being constructed to better understand the molecular underpinnings of helical growth and its behavior during the many growth responses of the sporangiophores to sensory stimuli. Previous experimental and theoretical findings guide the development of these local models. Future development requires an investigation of explicit and implicit assumptions made in the prior research. Here, experiments are conducted to test three assumptions made in prior research, that (a) elongation rate, (b) rotation rate, and (c) helical growth steepness, R, of the sporangiophore remain constant during the phototropic response (bending toward unilateral light) and the avoidance response (bending away from solid barriers). The experimental results reveal that all three assumptions are incorrect for the phototropic response and probably incorrect for the avoidance response but the results are less conclusive. Generally, the experimental results indicate that the elongation and rotation rates increase during these responses, as does R, indicating that the helical growth steepness become flatter. The implications of these findings on prior research, the “fibril reorientation and slippage” hypothesis, global biophysical equations, and local statistical biophysical models are discussed.

Tangent algorithm for photogravitropic balance in plants and Phycomyces blakesleeanus: roles for EHB1 and NPH3 of Arabidopsis thaliana

2021 ◽  
pp. 153396
Author(s):  
Michaela Dümmer ◽  
Sladjana Z. Spasić ◽  
Martin Feil ◽  
Christian Michalski ◽  
Christoph Forreiter ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Phycomyces Blakesleeanus

scholarly journals Yeast Chitin Synthetase

1973 ◽  
Vol 248 (4) ◽  
pp. 1451-1458
Author(s):  
Enrico Cabib ◽  
Rodney Ulane ◽  
Blair Bowers
Keyword(s):  
Chitin Synthetase

Excess carotenoids disturb prospective cell-to-cell recognition system in mating responses of Phycomyces blakesleeanus

Mycoscience ◽  
1996 ◽  
Vol 37 (4) ◽  
pp. 427-435 ◽  
Author(s):  
Tamotsu Ootaki ◽  
Yutaka Yamazaki ◽  
Toshiro Noshita ◽  
Shunya Takahashi
Keyword(s):  
Recognition System ◽  
Cell Recognition ◽  
Phycomyces Blakesleeanus
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