In the shoots of 7-day-old seedlings of wheat (Triticum durum Desf., cv. Bezenchukskaya 139), ion deficiency in Hoagland-Arnon nutrient solution induced a decrease in the cytokinin content by the end of the first day, whereas the excision of four out of five primary roots brought about an opposite response (accumulation of cytokinins) as early as during the first hour. It was assumed that changes in the content of cytokinins might depend on the activity of cytokinin oxidase (CKO) and the expression of gene encoding this enzyme. It was shown that tenfold dilution of the nutrient solution activated CKO and raised the level of CKO gene expression, whereas excision of some roots brought about a quick decrease in enzyme activity and gene expression. The role of ABA and arrival of cytokinins from the roots to the shoot as factors affecting CKO activity in the shoot is discussed; arguments for the priority of hormonal signal over the influx of nitrates from the roots are offered. It was concluded that the regulation of CKO activity might be one of the important mechanisms determining plant response to treatments via the changes in the cytokinin concentration.
Russian Journal of Plant Physiology – Springer Journals
Published: Jul 7, 2010
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
All the latest content is available, no embargo periods.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud