Full TGIF Record # 71211
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Jiang, Z.; Sullivan, W. M.
Author Affiliation:University of Rhode Island
Title:Regulation of Kentucky bluegrass root development by nitrate availability
Section:Turfgrass science
Other records with the "Turfgrass science" Section
Meeting Info.:Minneapolis, MN: November 5-9, 2000
Source:2000 Annual Meeting Abstracts [ASA/CSSA/SSSA]. 2000, p. 164.
# of Pages:1
Publishing Information:[Madison, WI]: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America
Keywords:TIC Keywords: Poa pratensis; Root growth; Nitrogen; Nutrient availability; Seeding; Seedlings
Cultivar Names:Eclipse
Abstract/Contents:"In Arabidopsis, nitrate, but not ammonium, stimulates meristematic activity in lateral root tips, leading to elongated roots, whereas high concentrations of nitrate delay activiation of lateral root meristems, resulting in undeveloped roots. This information would benefit turfgrass N management if proved to be true in turfgrasses. Our study compared the effects of nitrate at 0.5 or 15 mM, and ammonium at 0.5 mM, on Kentucky bluegrass (Poa pratensis L.) root development. Cultivar Eclipse seeds were surface-sterilized and sown on a medium containing 23 mM MES (pH 5.7), 0.5% (w/v) sucrose, 1% agar, and 1:50 diluted B5 salts, in which N source was 0.01 mM ammonium nitrate. Twenty five days after seeding, seedlings were aseptically transferred to fresh medium, in which final dilution of B5 salts was 1:2 and N source was 0.5 or 15 mM nitrate, or 0.5mM ammonium. Ten days after transfer, roots were scanned and morphological traits were analyzed using Delta-T scan. Nitrate and ammonium at 0.5 mM increased the number of root tips, total root length, surface, and volume over 15 mM nitrate. The increase in total root length was largely due to that of fine roots with diameters smaller than 0.0423 mm. We observed little differences between 0.5 mM nitrate and ammonium. Our results suggest that nitrate or ammonium at low concentrations promotes root development, whereas nitrate at high concentrations inhibits root development."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Jiang, Z., and W. M. Sullivan. 2000. Regulation of Kentucky bluegrass root development by nitrate availability. Annu. Meet. Abstr. p. 164.
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MSU catalog number: S 1 .A58
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