Skip Navigation

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Yoneyama, T.
Right arrow Articles by Takeba, G.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Yoneyama, T.
Right arrow Articles by Takeba, G.
Agricola
Right arrow Articles by Yoneyama, T.
Right arrow Articles by Takeba, G.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Plant and Cell Physiology, 1984, Vol. 25, No. 1 39-48
© 1984

Article

Compartment Analysis of Nitrogen Flows through Mature Leaves

Tadakatsu Yoneyama1 and Go Takeba2

1Department of Applied Physiology, National Institute of Agrobiological Resources Kannondai, Tsukuba, Ibaraki 305, Japan
2Faculty of Living Science, Kyoto Prefectural University Kyoto 606, Japan

Nitrogen flows in mature leaves of rice, sunflower and corn were analyzed by multicompartment analyses of data from 15N tracer experiments. The fourcompartment model fit the measured data better than the two- or three-compartment models. Rate constants of the nitrogen flows, transfers with or without protein turnover and flow through a storage pool of soluble-N, were derived from a least-squares fit between the mathematical expressions and the corresponding measured data.

Results of computations indicated the following: The flow of nitrogen through the protein pool was larger than the direct flow in recently matured leaves, whereas the reverse was true in senescent leaves. The presence of a temporary storage pool of soluble N was suggested, and the half-life of the N exchange in that pool was estimated to be roughly the amount of the insoluble N present in three of the four cases examined. The half-lives of insoluble N (protein) pools were 35 to 150 h. The pool for the N efflux from the leaves was small with the shortest half-lives (most less than 2 h) of N turnover. Some recycling of N during protein turnover was suggested in sunflower leaves, but the extent in the leaves of rice seedlings was estimated to be little.

(Received April 28, 1983; Accepted October 6, 1983)
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer:
Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.