Alternative fruiting pathways in phycomyces.

Developmental distinctions between giant and dwarf fruiting bodies of Phycomyces blakesleeanus (Burgeff) were studied by means of size measurements and growth analyses. Histograms of fruiting body lengths showed a bimodal distribution, with peaks around 0.3 millimeter (dwarfs) and 30 millimeters (giants).

Crystalloids of phycomyces sporangiophores: nature and photosensitive accumulation.

Crystalloids accumulate in the vacuoles of the giant sporangiophores of Phycomyces blakesleeanus Burgeff during growth. On the basis of solubility in alkaline solutions, cytochemical staining reactions, trypsin sensitivity, optical absorption and response in the Lowry protein test, the crystalloids have been judged to consist principally of an acidic protein. In assays by Lowry test and by reference to optical absorption at 280 mmu, dark-grown sporangiophores were consistently found to contain from 2 to 4 times as much crystalloid material as light-grown counterparts.

Transient effects of light on auxin transport in the Avena coleoptile.

The transport of indole-3-acetic acid-1-(14)C (IAA) through 4 mm segments of etiolated Avena coleoptiles was studied as a function of time by applying IAA in apical agar blocks and measuring the basal IAA export rate at 5-minute intervals. The transport velocity found in this way is at least 15 mm/hour at 26 degrees . Following a 30-minute equilibration period, the export rate is nearly constant for at least 50 minutes at physiological donor concentrations.