| |
| Web URL(s): | https://archive.lib.msu.edu/tic/its/articles/2005jou834.pdf
Last checked: 09/29/2008
Requires: PDF Reader |
|---|
| Access Restriction: | Certain MSU-hosted archive URLs may be restricted to legacy database members. |
|---|
| Publication Type:
| Refereed |
|---|
| Author(s): | Bushoven, John T.;
Hull, Richard J. |
|---|
| Author Affiliation: | Department of Plant Sciences, University of Rhode Island, Kingston, Rhode Island |
|---|
| Title: | The role of nitrate in modulating growth and partitioning of nitrate assimilation between roots and leaves of perennial ryegrass (Lolium perenne L.) |
|---|
| Section: | Physiology/stress physiology
Other records with the "Physiology/stress physiology" Section
|
|---|
| Meeting Info.: | Llandudno, Wales, UK: July 10-15 2005 |
|---|
| Source: | International Turfgrass Society Research Journal. Vol. 10, No. Part 2, 2005, p. 834-840. |
|---|
| Publishing Information: | Aberystywth, Ceredigion, UK: International Turfgrass Society |
|---|
| # of Pages: | 7 |
|---|
| Keywords: | TIC Keywords: Nitrates; Nitrate nitrogen; Growth; Assimilation; Roots; Leaves; Lolium perenne; Nitrate reductase; Partitioning; Rooting capacity
|
|---|
| Cultivar Names: | Palmer III |
|---|
| Abstract/Contents: | "In perennial grasses most NO3- is reduced and assimilated in leaves. A growing body of evidence indicates that NO3- transport to and assimilation in leaves reduces the partitioning of carbon to roots. Since roots are dependent on leaf derived carbohydrates to support metabolism and growth, concentrating NO3- assimilation in roots may increase root growth and sink activity. This increase in root growth can enhance a grass' ability to acquire N and other mineral nutrients from the soil. The objectives of the present investigation were to test the hypotheses that root NO3- assimilation of perennial grasses is limited by: (i) Nitrate reductase (NR) capacity and/or (ii) NR access to NO3-. To meet these objectives, we examined the partitioning of NO3- assimilation between leaves and roots, as well as the growth responses of the perennial grass Lolium perenne L. cultivar 'Palmer III' supplied with 0.01, 0.09, 0.2, or 0.5 mM NO3-. As the external NO3- supply to roots of these grasses increased, more NO3- was transported to leaves prior to its reduction and assimilation. Partitioning of mass to roots was inversely proportional to NO3- supply to roots. At external NO3- concentrations above 0.09 mM, it appears that the root capacity for NO3- assimilation becomes saturated. At all NO3- concentrations, the leaves remained the predominant site of NO3- assimilation. Reducing NO3- transport from roots to leaves by growing grasses either in solutions lacking potassium or in the presense of sodium chloride, indicated that one of the limiting factors may be the rate at which NO3- translocation to leaves occurs. This suggests that inhibiting NO3- loading into xylem vessels may enhance root capacity for NO3- assimilation. These data will contribute towards efforts to develop perennial grass cultivars exhibiting increased root growth and enhanced NO3- uptake under low N conditions." |
|---|
| Language: | English |
|---|
| References: | 36 |
|---|
| Note: | Tables
Graphs |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bushoven, J. T., and R. J. Hull. 2005. The role of nitrate in modulating growth and partitioning of nitrate assimilation between roots and leaves of perennial ryegrass (Lolium perenne L.). Int. Turfgrass Soc. Res. J. 10(Part 2):p. 834-840. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=105720 |
| If there are problems with this record, send us feedback about record 105720. |
| Choices for finding the above item: |
|---|
| Web URL(s):
https://archive.lib.msu.edu/tic/its/articles/2005jou834.pdf
Last checked: 09/29/2008
Requires: PDF Reader |
| 
MSU catalog number: SB 433 .I52 v. 10 |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
