Abstract
Levels of isopentenyladenosine and zeatin riboside were monitored in buds and needles of Scots pine (Pinus sylvestris L.) seedlings grown under controlled climatic conditions and in field‐grown trees. Extracts were purified by immunoaffinity chromatography and high‐performance liquid chromatography. Cytokinin levels were quantified with an enzyme‐linked immunosorbent assay. The cytokinin content was low in buds and needles of dormant seedlings but increased during dormancy release, reaching peak values in buds just before resumption of shoot growth. Samples collected in the field also showed a marked increase in the levels of cytokinins just prior to bud burst. Further, the biological activity of applied cytokinins in activating the dormant buds of Scots pine is shown. The results indicate a probable role of cytokinins in seedlings during dormancy release.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
