Some Morphological Characteristics of Perennial Ryegrass Genotypes and Correlations among Their Characteristics

Authors: A. Özköse, A. Tamkoç

Abstract:

The present study involved analysis of certain characteristics of the perennial ryegrass (Lolium perenne L.) genotypes collected from the natural flora of Ankara, and explores a correlation among them. In order to evaluate the plants for breeding purpose as per Turkey's environmental conditions, the perennial ryegrass plants were collected from natural pasture of Ankara in 2004 and were utilized for the study. Seeds of the collected plants were sown in pots and seedlings were prepared in a greenhouse. In 2005, the seedlings were transplanted at 50 × 50 cm2 intervals in Randomized Complete Blocks Design in an experimental field. In 2007 and 2008, data were recorded from the observations and measurements of 568 perennial ryegrasses. The plant characteristics, which were investigated, included re-growth time in spring, color, density, growth habit, tendency to form inflorescence, time of inflorescence, plant height, length of upper internode, spike length, leaf length, leaf width, leaf area, leaf shape, number of spikelets per spike, seed yield per spike and 1000 grain weight and the correlation analyses were made using this data. Correlation coefficients were estimated between all paired combinations of the studied traits. The yield components exhibited varying trends of association among themselves. Seed yield per spike showed significant and positive association with the number of spikelets per spike, 1000 grain weight, plant height, length of upper internode, spike length, leaf length, leaf width, leaf area and color, but significant and negative association with the growth habit and re-growth time in spring.

Keywords: Correlation, morphological traits, Lolium perenne.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1097365

References:

[1] S. Bolaric, S. Bart, A. E. Melchinger, and U. K. Posselt, “Molecular Genetic Diversity Within and Among German Ecotypes in Comparison to European Perennial Ryegrass Cultivars,” Plant Breeding vol. 124, pp. 257-267, 2005.
[2] M. M. Hoover, M. A. Hein, W. A. Dayton, and C. O. Erlanson, "Grass, The Yearbook of Agriculture 1948,”. United States Department of Agriculture. The Superintendent of Document, Washington, 25, D.D., USA. 1948, pp. 675-677.
[3] L. Watson, and M. J. Dallwitz, “The Grass Genera of The World,” CAB International, Wallingford Oxon OX10 8DE. 1994.
[4] R.R. Mill, “Lolium L., In: Davis, P.H. (ed.) 1985. Flora of Turkey and the East Aegean Island,” Vol 9, Edinburg: Edinburg University Press, UK. s. 445-451 1985.
[5] P. Conaghan, and M. D. Casler, “A theoretical and practical analysis of the optimum breeding system for perennial ryegrass,” Irish Journal of Agricultural and Food Research vol. 50 pp. 47–63, 2011.
[6] Anonymous, “Guidelines For The Conduct of Test For Distinctness, Homogeneity any Stability, Ryegrass (Lolium spp.),” İnternational Union For The Protection Of New Varieties Of Plants (UPOV), http://www.upov.org/en/publications/tg-rom/tg004/tg_4_7.pdf. (20.09.2005) 1990.
[7] Anonymous, “Farklılık Yeknesaklık ve Durulmuşluk Testleri için Bitki Özellik Belgesi, Çim (Ryegrass),” Tarım ve Köy İşleri Bakanlığı, Tohumluk Tescil ve Sertifikasyon Merkezi Müdürlüğü, Ankara, 1998. (in Turkish)
[8] Anonymous, “National Plant Germplasm System, National Turfgrass Evaluation Program (NTEP),” United States Department of Agriculture (USDA), Agricultural Research Service, (USA). http://www.arsgrin. gov/npgs/descriptors/grass (01.12.2005) 2005.
[9] K. N. Morris, “A Guide to NTEP (National Turfgrass Evaluation Program) Turfgrass Ratings,” http://www.ntep.org/reports/ratings. htm#introduction (22.11.2005) 2005
[10] A. Elgersma, “Floret site utilization in grasses: definitions, breeding perspective and methodology,” Journal of Applied Seed Production vol. 3 pp. 50-54, 1985
[11] A. Elgersma, “Heritability estimates of spaced-plant traits in three perennial ryegrass (Lolium perenne L.) cultivars,” Euphytica vol. 51(2), pp. 163-171, 1990.
[12] D. A. Diz, D. S. Wofford, and S. C. Schank, “Correlation and pathcoefficient analyses of seed-yield components in pearl millet x elephantgrass hybrids,” Theoretical and Applied Genetics vol. 89(1), pp. 112-115, 1994.
[13] L. Jian, S. ShengRong, and Y. AiXing, “Path-coefficient analysis of seed yield and some major agronomic characteristics in turf-type Lolium perenne,” Grassland of China vol. 1, pp. 31-34, 2000.
[14] S. Pourmoradi, and H. Mirzaie Nodoushan, “Path Analysis of Morphological Traits and Forage Yield on Several Populations of Lolium Species,” Iranian Journal of Rangelands and Forests Plant Breeding and Genetic Research vol. 18(36), pp. 294-304, 2011.
[15] Z. Acar, I. Ayan, O. Tongel, H. Mut, U. Basaran, “Morphological traits of perennial ryegrass accessions in Black Sea Region of Turkey,” The Contributions of Grasslands to Conservation of Mediterranean Biodiversity. Alicante-Spain, pp. 117-120, 2010.
[16] H. Okkaoglu, “Investigations on the seed yield and various agronomical characteristics of some forage grasses” MSc. Thesis. In Field Crops Department, Institute of Natural and Applied Sciences, Ege University, Izmir, Turkey, p.106. 2006. (in Turkish).