Full TGIF Record # 184499
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Publication Type:
Author(s):DaCosta, M.; Ebdon, J.S.; Jiang, Z.
Author Affiliation:DaCosta and Ebdon: Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, MA; Jiang: Department of Plant Science, College of Agriculture and Technology, State University of New York, Cobleskill, NY
Title:Relationship between cell wall components and nitrogen use efficiency in dollar spot resistance in Agrostis species and cultivars: 2007 progress report submitted to the NERTF
Section:Turf physiology research
Other records with the "Turf physiology research" Section
Meeting Info.:South Deerfield, Massachusetts: June 18, 2008
Source:University of Massachusetts Turf Research Field Day. 2008, p. 115-131.
# of Pages:17
Publishing Information:Amherst, MA: University of Massachusetts
Keywords:TIC Keywords: ANOVA; Agrostis canina; Agrostis stolonifera; Disease severity; Dollar spot; Golf greens; Hemicellulose; Morphological evaluation; Nitrate reductase; Nitrogen efficiency; Sclerotinia homoeocarpa; Stoloniferous growth habit; Tissue testing
Abstract/Contents:"Dollar spot caused by Sclerotinia homoeocarpa is one of the most economically important diseases affecting golf greens. Dollar spot susceptibility varies among (Agrostis) species and cultivars, with velvet bentgrass (Agrostis canina L.) exhibiting superior resistance to dollar spot compared to creeping bentgrass (Agrostis stolonifera L.). Leaf surface properties, including anatomical, physiological, and morphological traits may affect the ability of the fungus to penetrate leaves and cause infection. The relationship between leaf cell wall components and dollar spot severity has not been investigated in these species. Efficient use of Nitrogen (N) and higher nitrogen use efficiency (NUE, greater productivity-to-plant N ration has been proposed in turfgrass to maintain turf function with less N, which is the current trend in the management of golf greens. NUE has been shown to be related to nitrate reductase activity (NRA) but its relationship to dollar spot has not been investigated. Our objectives were to evaluate dollar spot severity among cultivars of creeping and velvet bentgrass and determine relationships between cell wall components, NUE and NRA with dollar spot disease. Dollar spot, total cell wall (TCW), ligno- and hemi-cellulose contents, shoot NUE and NRA measurements were be made in the field on seven velvet bentgrass and seven creeping bentgrass entries as part of the 2003 NTEP Bentgrass Greens Test. A USGA green was used and maintained without fungicides during summer months, mowed at 5/32 inch height of cut, and fertilized with 3 pounds of total N per 1000ft2 per year. Dollar spot severity counts were made in early September and October of 2007 while NRA and NUE were determined in July. Velvet bentgrass cultivars exhibited lower disease severity to dollar spot compared to creeping bentgrass except under severe disease pressure. Shoot NRA and NUE were positively correlated. Dollar spot tolerant velvet bentgrass cultivars exhibited significantly lower NRA and NUE compared to dollar spot susceptible creeping bentgrass entries. NRA was positively correlated with dollar spot severity accounting for at least 50% of the total variation in disease severity. Dollar spot tolerant creeping bentgrass cultivars such as Declaration exhibited greater hemicellulose content compared to intolerant cultivars such as Independence. Leaf hemicellulose content accounted for at least 30% of the variation in Agrostis dollar spot severity. NUE was not correlated with dollar spot disease in Agrostis species and cultivars. These measurements will be repeated in 2008. However, first year results suggest that lower shoot NRA and greater leaf hemicellulose content, especially in dollar spot susceptible creeping bentgrass cultivars, may lower disease incidence. The data does not support the notion that NUE under the conditions of this test provides any influence on dollar spot severity. These results suggest that balanced N fertility in the management of creeping bentgrass is critical to balancing the competing effects of N fertility on dollar spot severity with leaf NRA and hemmicellulose content in Agrostis species and cultivars."
Note:Summary appears as abstract
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
DaCosta, M., J.S. Ebdon, and Z. Jiang. 2008. Relationship between cell wall components and nitrogen use efficiency in dollar spot resistance in Agrostis species and cultivars: 2007 progress report submitted to the NERTF. p. 115-131. In University of Massachusetts Turf Research Field Day. South Deerfield, Massachusetts: June 18, 2008. Amherst, MA: University of Massachusetts.
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