| |
| Web URL(s): | https://www.crops.org/publications/cs/pdfs/39/3/CS0390030746
Last checked: 08/05/2010
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
|---|
| Publication Type:
| Refereed |
|---|
| Author(s): | Jiang, Zhongchun;
Hull, Richard J. |
|---|
| Author Affiliation: | Department of Plant Sciences, University of Rhode Island, Kingston, RI |
|---|
| Title: | Partitioning of nitrate assimilation between shoots and roots of Kentucky bluegrass |
|---|
| Section: | Turfgrass science
Other records with the "Turfgrass science" Section
|
|---|
| Source: | Crop Science. Vol. 39, No. 3, May/June 1999, p. 746-754. |
|---|
| Publishing Information: | Madison, WI: Crop Science Society of America |
|---|
| # of Pages: | 9 |
|---|
| Keywords: | TIC Keywords: Poa pratensis; Nitrates; Nutrient uptake; Partitioning; Relative growth rate; Nitrate reductase; Metabolism; Root-shoot ratio; Cultivar variation; Application rates; Oxygen; Total nonstructural carbohydrate content
|
|---|
| Cultivar Names: | Livingston; Merit |
|---|
| Abstract/Contents: | "Turfgrass roots play an important role in the overall metabolism of NO₃⁻ partly because leaves of turfgrasses are partially lost during mowing. Nitrate transported to shoots stimulates shoot growth and decreases N use efficiency through clipping removal. This study was conducted to quantify NO₃⁻ reduction by shoots and roots of Kentucky bluegrass (Poa pratensis L.). Two cultivars, Livingston, which performed better under high N fertility, and Merit, which performed better under low N fertility, were grown in aerated nutrient solution containing 0.1 to 5.2 mM NO₃⁻. These grasses were analyzed for relative growth rate (RGR), shoot/root ratio (S/R), in situ NO₃⁻ uptake rate (NUR), in vivo NO₃⁻ reductase activity (NRA), metabolic NO₃⁻ pool (MNP), and storage NO₃⁻ pool (SNP) in shoots and roots. Under low NO₃⁻ levels, Merit exhibited a higher NUR, a larger root SNP, a smaller shoot SNP and a greater RGR than Livingston. Under high NO₃⁻ levels, Livingston exhibited a greater shoot growth rate and reduced a greater proportion of NO₃⁻ in its shoots than did Merit. In both cultivars, root contribution to the plant total NO₃⁻ reduction (PTNR), estimated from NRA, was <5%. When dissolved O₂ was decreased and root carbohydrate content increased, root contribution to PTNR increased to 40 and 15%, respectively. Our results suggest that root carbohydrate status and root-zone O₂ levels strongly influence root contribution to PTNR and N use efficiency of Kentucky bluegrass in response to N fertility. This in turn is a function of the partitioning of NO₃⁻ assimilation between shoots and roots." |
|---|
| Language: | English |
|---|
| References: | 36 |
|---|
| Note: | Tables
Graphs |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Jiang, Z., and R. J. Hull. 1999. Partitioning of nitrate assimilation between shoots and roots of Kentucky bluegrass. Crop Sci. 39(3):p. 746-754. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=60017 |
| If there are problems with this record, send us feedback about record 60017. |
| Choices for finding the above item: |
|---|
| Web URL(s):
https://www.crops.org/publications/cs/pdfs/39/3/CS0390030746
Last checked: 08/05/2010
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
| 
MSU catalog number: SB 183 .C7 |
| Find from within TIC:
Digitally in TIC by record number. |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
