| bd | Because dense bands of conidia are produced on appropriate solid medium at intervals of
about 24 hr
(1792, 1794), the mutant has been used extensively to study circadian rhythms
(239, 560, 621, 1382,
1794). bd has no effect on the underlying clock mechanism, but allows the visible
expression of rhythm
(622). Grow rate is about 70% that of the wild type (232). Conidiation is enhanced, even on slants (232).
CO2 inhibits conidiation and, thus, inhibits banding; bd is much less
sensitive than wild type to this effect
of CO2 (1792). Biotin starvation leads to a phenocopy in wild type and to
increased persistence of
banding in bd (2206). Originally identified in a bd; inv strain called "timex"
(1791). bd alone is
sufficient to cause banding (1794). Used to study conidiation under nonstarvation conditions (1820).
Used in a study of morphological differentiation patterns such as concentric rings and radial
zonations
(528). Expression is affected by changing the concentrations of agar,
sugar, and salts. Conidial scatter is
eliminated in the double mutant bd; csp (239). Conveniently scored by conidial banding on agar in long
tubes or large plates at 25oC in constant dark or in a dark-light cycle, but not in
constant light (1791). | IVR | B |
