Full TGIF Record # 184849
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Author(s):DaCosta, M.; Ebdon, J. S.
Author Affiliation:Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, MA
Title:Relationship between cell wall components and nitrogen use efficiency in dollar spot resistance in Agrostis species and cultivars: Final report submitted to NERTF
Section:Turf physiology research
Other records with the "Turf physiology research" Section
Meeting Info.:South Deerfield, Massachusetts: June 17, 2009
Source:University of Massachusetts Turf Research Field Day. 2009, p. 89-105.
# of Pages:17
Publishing Information:Amherst, MA: University of Massachusetts
Keywords:TIC Keywords: Agrostis canina; Agrostis stolonifera; Cell wall; Disease resistance; Dollar spot; National Bentgrass Test - 2003 (Putting Green); Nitrogen efficiency; Sclerotinia homoeocarpa
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, such as anatomical (cell wall) may affect the ability of the fungus to penetrate leaves and cause infection but this has not been investigated in these species. Efficient use of Nitrogen (N) and higher nitrogen use efficiency (NUE, greater productivity-to-plant N ratio) has been proposed in turfgrass to maintain turf function with less N. 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 Agrostis cultivars and determine its relationship with cell wall components, NUE and NRA. Dollar spot, total cell wall (TCW), ligno- and hemi-cellulose contents, shoot NUE and NRA measurements were be made in the field in 2007 and 2008 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 3.5 pounds of total N 1000ft-2 year-1. Dollar spot severity counts were made in August, September and October, while NRA and NUE were determined in July. Velvet bentgrass cultivars exhibited superior dollar spot tolerance than creeping bentgrass when disease pressure was moderate (10-infection centers 18 ft-2). In both years NRA and NUE were consistently lower in velvet bentgrass compared to creeping bentgrass. Significantly greater variation in shoot NRA and dollar spot incidence was found in creeping bentgrass cultivars. In some years dollar spot incidence was lower in Agrostis cultivars of creeping and velvet bentgrass exhibiting lower shoot NRA. Agrostis cultivars exhibiting higher levels of shoot NRA were prone to greater disease, which may be associated with greater levels of free amino acids (nutrients) in leaf tissues for promoting fungal growth. Dollar spot tolerance was greater in cultivars of creeping bentgrass with greater leaf cell wall content derived from hemicellulose. Velvet bentgrass cultivars exhibiting greater leaf cell wall content from lignocellulose was associated with less dollar spot disease. These results may assist breeders to improve dollar spot tolerance in Agrostis.
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
DaCosta, M., and J. S. Ebdon. 2009. Relationship between cell wall components and nitrogen use efficiency in dollar spot resistance in Agrostis species and cultivars: Final report submitted to NERTF. p. 89-105. In University of Massachusetts Turf Research Field Day. South Deerfield, Massachusetts: June 17, 2009. Amherst, MA: University of Massachusetts.
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