Abstract:
:Phytochrome, activated by continuous red light, increases the amount of total polyadenylated RNA during photomorphogenesis of mustard (Sinapis alba L.) cotyledons. In-vitro translation of total polyadenylated RNA in a reticulocyte translation system has shown that the activity of translatable β-amylase mRNA is increased by phytochrome about threefold in the 3-d-old cotyledons, based on equal amounts of polyadenylated RNA, and about eightfold on a per-cotyledon basis. Cordycepin prevents the accumulation of translatable β-amylase mRNA. It is concluded that the phytochrome-mediated control of β-amylase synthesis is exerted on the level of mRNA synthesis. During seedling development in continuous red light, a phytochrome-dependent increase of β-amylase mRNA can be observed at least 6 h before the onset of β-amylase synthesis. If, after a period of enzyme synthesis, phytochrome action is interrupted by long-wavelength far-red light followed by darkness, β-amylase mRNA as well as β-amylase synthesis remain at a high level for 8-10 h and then decline sharply. It is concluded that β-amylase mRNA, having an apparent lifetime of the order of 8-10 h, can be formed under the influence of phytochrome during early seedling development but it activates β-amylase synthesis only after a lag-phase of about 8 h, when the cotyledons acquire competence to synthesize the enzyme. The consequences of these findings for the signal-transduction chain of phytochrome are discussed.
journal_name
Plantajournal_title
Plantaauthors
Sharma R,Schopfer Pdoi
10.1007/BF00398676subject
Has Abstractpub_date
1987-07-01 00:00:00pages
313-20issue
3eissn
0032-0935issn
1432-2048journal_volume
171pub_type
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