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Plastids are evolutionary descendants of cyanobacteria and retain many proteins of cyanobacterial origin including histidine kinases (HKs). Histidine kinases form a major group of protein kinases in cyanobacteria but a minor group in angiosperms; no HK has been detected in plant plastids so far. This raises the question: have higher plant plastids retained some cyanobacterial His/Asp regulatory systems...
The introduction of the gene for cytokinin biosynthesis into the potato genome led to a manifold increase in the level of cytokinins (zeatin and zeatin riboside) in transgenic plants grown in vitro. The high amount of endogenous cytokinins in 20-day-old plants of clone 1339-3A correlated with high cytokinin-binding capacity of ribosomes that is presumably attribute to a cytokinin receptor.
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