Abstract:
:Ambient light is the major agent mediating entrainment of circadian rhythms and is also a major factor influencing development and morphogenesis. We show that in Neurospora crassa the expression of clock-controlled gene 2 (ccg-2), a gene under the control of the circadian clock and allelic to the developmental gene easy wettable (eas), is regulated by light in wild-type strains. Light elicits a direct and important physiological effect on ccg-2(eas) expression as demonstrated using several mutant Neurospora strains. In white collar mutants (wc-1 and wc-2) that are "blind" to blue light, ccg-2(eas) mRNA shows no variation following illumination with saturating light. By contrast, ccg-2(eas) mRNA is photoinduced in clock-null strains such as frequency (bd;frq). The results in the clock mutants show that an intact circadian oscillator is not required for light induction of ccg-2(eas). Thus, ccg-2(eas) is subject to a dual regulation that involves separable regulation by light and circadian rhythm.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Arpaia G,Loros JJ,Dunlap JC,Morelli G,Macino Gdoi
10.1104/pp.102.4.1299subject
Has Abstractpub_date
1993-08-01 00:00:00pages
1299-305issue
4eissn
0032-0889issn
1532-2548pii
102/4/1299journal_volume
102pub_type
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