Full TGIF Record # 65431
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Tan, Z. G.; Qian, Y. L.
Author Affiliation:Colorado State University
Title:Effects of light intensity of gibberellic acid contents in Kentucky bluegrass
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. 157-158.
# of Pages:2
Publishing Information:[Madison, WI]: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America
Keywords:TIC Keywords: Light intensity; Gibberellic acid; Poa pratensis; Leaf blade length; Trinexapac-ethyl; Biosynthesis
Cultivar Names:Kenblue; Livingston; NuGlade
Abstract/Contents:"Turfgrasses grown under low light conditions generally exhibit increased shoot elongation. Gibberellic acids (GAs), GA1 in particular, promote stem elongation in grass species. However, a direct quantitative measurement of GA1 and its immediate precursor, GA20, has not been reported for turfgrass under different light intensities. This study was conducted in the greenhouse to quantify the endogenous levels of GA1 and GA20 of 'Kenblue', 'Livingston', and 'NuGlade' Kentucky bluegrass cultivars under two light intensities with and without trinexapac-ethyl (TE) application. The contents of GA1 and GA20 were analyzed using gas chromatography - mass spectometry with deuterium-labeled GAs as internal standards. A light reduction of 73% from the greenhouse conditions increased by GA1 by 42% and GA20 by 30%. NuGlade had a GA1 content of 20% lower than that of Kenblue, suggesting that the dwarf habit of NuGlade may be related to its low GA1 content. The application of TE (0.1 kg a.i. ha-1) reduced GA1 concentration by 47%, but increased GA20 by 146%, confirming that TE inhibted the GA1 biosynthesis by blocking the conversion of GA20 to GA1."
Note:This item is an abstract only!
See Also:Other items relating to: PGRSHADE
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Tan, Z. G., and Y. L. Qian. 2000. Effects of light intensity of gibberellic acid contents in Kentucky bluegrass. Annu. Meet. Abstr. p. 157-158.
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MSU catalog number: S 1 .A58
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