Abstract:
:The possible involvement of nucleic acid and protein synthesis in light-regulated chlorophyll formation by rapidly greening leaves has been studied.Removing leaves from illumination during the phase of rapid greening results in a reduction in the rate of pigment synthesis; cessation occurs within 2 to 4 hours. Etiolated leaves which exhibit a lag in pigment synthesis when first placed in the light do not show another lag after a 4 hour interruption of illumination during the phase of rapid greening.Actinomycin D, chloramphenicol, and puromycin inhibit chlorophyll synthesis when applied before or during the phase of rapid greening. Application of delta-amino-levulinic acid partially relieves the inhibition by chloramphenicol.It is suggested that light regulates chlorophyll synthesis by controlling the availability of delta-aminolevulinic acid, possibly by mediating the formation of an enzyme of delta-aminolevulinate synthesis. This process may result from gene activation or derepression; the involvement of RNA synthesis of some sort is suggested by the inhibitory effect of actinomycin D on chlorophyll production by rapidly greening leaves.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Gassman M,Bogorad Ldoi
10.1104/pp.42.6.774subject
Has Abstractpub_date
1967-06-01 00:00:00pages
774-80issue
6eissn
0032-0889issn
1532-2548journal_volume
42pub_type
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