Parameters of sugar beet (Beta vulgaris L.) leaf senescence were investigated in the stage of vegetative growth in plants grown at normal nitrate level (N) or under its deficiency (DefN). Accelerated senescence was initiated by the 41-h-long exposure of leaf discs on the surface of water with alternating darkness and light. In plants grown at DefN, the number of leaves and their average area decreased; after the incubation of the discs from such leaves on water, the content of soluble carbohydrates (sCarb) and especially of glucose sharply increased as compared with normal level of nitrate (N), whereas the content of soluble protein (sProt) and Rubisco activity considerably decreased, which is characteristic of the negative hexokinase (HXK1) effect of glucose. The rate of a decrease in the content of sProt in the course of leaf senescence calculated for the leaf of each strorey was lower than the rate of a decrease in RuBisCO activity. A decrease in the content of sProt and RuBisCO activity in all the storeys of leaves grown at joint action of nitrate deficit (DefN) and incubation on water was on the average greater than in each of these treatments separately but less than the sum of these effects. The imperfection of the putative mechanism of signal transduction at DefN and excess glucose and their interaction in senescent sugar beet leaves is discussed as well as the opportunity to use the ratio between sCarb and sProt for the evaluation of the manifestation of the negative hexokinase effect of glucose.
Russian Journal of Plant Physiology – Springer Journals
Published: Jun 24, 2014
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.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera