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Long-Term Summary of Ryegrass Varieties and Ploidy Types in Mississippi

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Annual ryegrass (Lolium multiflourum) is the most important cool-season forage crop in Mississippi. It is seeded on more than 500,000 acres every year in the state and consequently seed companies intensely market the area with claims of superior genetic performance. Marketing literature observed in Mississippi focuses on the performance of tetraploid (4×) versus diploid (2×) with claims that 4× varieties provide better yield, disease resistance, and seedling vigor. These claims have rarely been substantiated on long-term performance variety trials. Archived Mississippi State forage variety test data from 1987 to 2012 were compiled for 10 diploid and tetraploid varieties grown at four physiographic locations (Starkville, Raymond, Newton, and Poplarville). Differences in the mean yields between 2× and 4× were only detected in Newton and Poplarville, where 2× varieties had a 4% yield advantage and 4× averaged 10% greater yields, respectively. Across the state, ryegrass yields for both ploidy levels increased over time (4×, R = 0.19931, P = 0.0105 & 2×, R = 0.18816, P = 0.0003), but correlations were variable by location. Biomass yields for both ploidy levels decreased over time in Starkville despite an increase in GDD (Growing Degree Days). With the exception of Raymond, year was the only factor influencing yield. The data suggest that ploidy level of ryegrass in Mississippi has minimal impact on seasonal yield production. However, genetic improvement other than polyploidy induction has increased yield over time.
Cite this paper
White, J. and Lemus, R. (2014) Long-Term Summary of Ryegrass Varieties and Ploidy Types in Mississippi. American Journal of Plant Sciences, 5, 3151-3158. doi: 10.4236/ajps.2014.521331. 
 

[1] Nelson, L.R., Alison, M.W., Glass, K.M., Lang, D., Rose, P.A. and Prine, G.M. (2006) Comparison of Forage Yields of Diploid versus Tetraploid Annual Ryegrass Cultivars in the Southern USA. Proceedings of the American Forage Grassland Council, 15, 221-225.
[2] Nelson, L. and Chrowder, J. (2011) Nelson Annual Ryegrass. Journal of Plant Registrations, 5, 45-48.
http://dx.doi.org/10.3198/jpr2010.02.0094crc
[3] Lemus, R. (2008) Forage Production Survey in Mississippi. Mississippi State University Extension Service. Unpublished Data.
[4] Prine, G.M. (2001) Evolutionary Recurrent Selection Develops Adapted Annual Ryegrass. Proceedings of the International Grassland Conference, Sao Paulo, 11-21 February 2001.
http://www.internationalgrasslands.org/files/igc/publications/2001/id1209.pdf
[5] Redfearn, D.D., Venuto, B.C., Pitman, W.D., Blouin, D.C. and Alison, M.W. (2005) Multilocation Annual Ryegrass Cultivar Performance over a Twelve-Year Period. Crop Science, 45, 2388-2393.
http://dx.doi.org/10.2135/cropsci2004.0322
[6] Edwards, N.C., Elmore, R., Hovernale, C.H., Johnson, B., Lang, D., McLean, S.D. and Watson, C.E. (1989) Winter Annual Forages 1989 Variety Trials. Mississippi State University Information Bulletin 149.
[7] Edwards, N.C., Elmore, R., Hovernale, C.H., Ingram, D.M., Ivy, R., Johnson, B., Lang, D., McLean, S.D. and Watson, C.E. (1990) Performance of Cool Season Forage Crops in Mississippi, 1989-1990. Mississippi State University Information Bulletin 175.
[8] Edwards, N.C., Elmore, R., Hovernale, C.H., Ingram, D.M., Ivy, R., Johnson, B., Lang, D. and White, R. (1991) Cool Season Forages, 1991 Variety Trials. Mississippi State University Information Bulletin 201.
[9] Edwards, N.C., Boykin, F., Elmore, R., Hovernale, C.H., Ingram, D.M., Ivy, R., Johnson, B., Pederson, D.G.A., Lang, D. and White, R. (1992) Perfomance of Forage Crop Varieties, 1991-1992 Variety Trials. Mississippi State University Information Bulletin 229.
[10] Edwards, N.C., Askew, J., Boykin, F., Burdine, W., Cuomo, G., Elmore, R., Hovernale, C.H., Ingram, D.M., Ivy, R., Johnson, B., Pederson, D.G.A., Lang, D., Saunders, R. and Tomlinson, J. (1993) Performance of Forage Crop Varieties, 1992-1993 Variety Trials. Mississippi State University Information Bulletin 247.
[11] Edwards N.C., Askew, J., Boykin, F., Burdine, W., Cuomo, G., Elmore., R., Hovernale, C.H., Ingram, D.M., Ivy, R., Johnson, B., Pederson, D.G.A., Lang, D., Saunders, R. and Tomlinson, J. (1994) Performance of Forage Crop Varieties, 1993-1994 Variety Trials. Mississippi State University Information Bulletin 269.
[12] Edwards N.C., Askew, J., Boykin, F., Burdine, W., Cuomo, G., Elmore., R., Hovernale, C.H., Ingram, D.M., Ivy, R., Johnson, B., Pederson, D.G.A., Lang, D., Saunders, R. and Tomlinson, J. (1995) Performance of Forage Crop Varieties, 1994-1995 Variety Trials. Mississippi State University Information Bulletin 289.
[13] Edwards N.C., Burdine, W., Elmore, R., Hovernale, C.H., Ingram, D.M., Ivy, R., Johnson, B., Pederson, D.G.A., Lang, D., Saunders, R. and Tomlinson, J. (1996) Performance of Forage Crop Varieties, 1995-1996 Variety Trials. Mississippi State University Information Bulletin 306.
[14] Edwards N.C., Burdine, W., Elmore, R., Hovernale, C.H., Ingram, D.M., Ivy, R., Johnson, B., Pederson, D.G.A. and Lang, D. (1998) Performance of Forage Crop Varieties, 1997-1998 Variety Trials. Mississippi State University Information Bulletin 342.
[15] Edwards N.C., Elmore, R., Hovernale, C.H., Ingram, D.M., Ivy, R. and Johnson, B. (1999) Performance of Forage Crop Varieties, 1998-1999 Variety Trials. Mississippi State University Information Bulletin 356.
[16] Edwards N.C., Boyd, B., Elmore, R., Hovernale, C.H., Ingram, D.M., Ivy, R. and Johnson, B. (2000) Mississippi Forage Crop Variety Trials, 2000. Mississippi State University Information Bulletin 369.
[17] Edwards, N.C., Boyd, B., Elmore, R., Hovernale, C.H., Ingram, D.M., Ivy, R., Johnson, B. and Macoon, B. (2001) Mississippi Forage Crop Variety Trials, 2001. Mississippi State University Information Bulletin 379.
[18] Lang, D., Boyd, B., Johnson, B., Macoon, B. and Smith, T. (2003) Mississippi Forage Crop Variety Trials, 2003. Mississippi State University Information Bulletin 401.
[19] Lang, D., Boyd, B., Johnson, B., Macoon, B. and Smith, T. (2004) Mississippi Forage Crop Variety Trials, 2004. Mississippi State University Information Bulletin 415.
[20] Lang, D. and Johnson, B. (2006) Mississippi Ryegrass Variety Trials, 2004-2006. Mississippi State University Information Bulletin 430.
[21] Lang, D., Johnson, B. Shankle, B. and Parish, J.R. (2008) Mississippi Ryegrass Variety Trials, 2006-2008. Mississippi State University Information Bulletin 450.
[22] Parish, J.R. (2010) Mississippi Annual Ryegrass Variety Trials, 2008-2009. Mississippi State University Information Bulletin 455.
[23] White, J., Lemus, R., Saunders, J.R., Fitzgerald, L., Johnson, B. and Morrison, J. (2012) Mississippi Annual Cool-Season Forage Crop, 2011-2012. Mississippi State University Information Bulletin 470.
[24] Brown, M.E. (2013) State Climatologist, Mississippi State University, Personal Communication.                                 eww141014lx
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