Light induced concentration changes of adenosine-triphosphate in phycomyces sporangiophores.
The concentrations of extractable adenosine triphosphate (ATP) following the induction of positive light-growth responses in Phycomyces sporangiophores by blue light stimuli have been measured by means of the luciferin-luciferase assay. The ATP concentration in the light-sensitive growing zone increases 30 to 50% within 30 seconds after the start of a light stimulus and returns to the normal adapted level within 1 minute after stimulation. The ATP concentration is constant for any level of light adaptation and is uniform along the length of sporangiophores even though the light sensitivity is confined to a growing zone less than 5 mm long. These results suggest that one of the initial biochemical steps after a light stimulus is the production of extractable ATP.
D000255:Adenosine Triphosphate / Q000378:metabolism*; D005658:Fungi / Q000254:growth & development*; D066298:In Vitro Techniques; D008027:Light
D000255:Adenosine Triphosphate