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Influence of environmental factors on seed germination and seedling emergence of rigid ryegrass (Lolium rigidum)

  • Bhagirath S. Chauhan, Gurjeet Gill (a1) and Christopher Preston (a2)

Rigid ryegrass is a major weed of southern Australian cropping systems. Increased knowledge about the germination biology of rigid ryegrass would facilitate development of effective weed control programs. The influence of different environmental factors on seed germination of rigid ryegrass was studied. The level of seed dormancy in five different populations, collected from different fields on the same farm, was found to be similar, suggesting consistency in seed dormancy in populations at a single location. Dormancy release was more rapid for seeds after-ripened in the field compared with those after-ripened dry in a greenhouse. Seed decay was found to be an important contributor to the loss of seeds for this species from the seed bank in the field. Seed decay was much greater for seeds after-ripened on the soil surface compared with buried seed. In contrast, germination played an important role in the loss of buried seed as compared with surface seed. Regardless of the burial depth, the dormant seed component present at the end of the growing season was quite small (4 to 16%). Seedling emergence of rigid ryegrass in the field was greater (49%) for seeds buried at 1 cm than for those on the soil surface (16%). No seedlings emerged from seeds buried at 10 cm. Seed germination of rigid ryegrass was tolerant to a wide range of pH and showed some tolerance to salt and osmotic stress. The results indicate rigid ryegrass is unlikely to become a greater weed problem in no-till compared with cultivated seeding systems.

Corresponding author
Corresponding author. School of Agriculture, Food and Wine, The University of Adelaide, Roseworthy Campus, South Australia, Australia 5371;
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Andersson, L. and Milberg, P. 1998. Variation in seed dormancy among mother plants, populations and years of seed collection. Seed Sci. Res. 8:2938.
Ballare, C. L., Ghersa, C. M., Sanchez, R. A., and Scopel, A. L. 1988. The fate of Datura ferox L. seeds in the soil as affected by cultivation depth of burial and degree of maturity. Ann. Appl. Biol. 112:337345.
Baskin, C. C. and Baskin, J. M. 1998. Seeds: ecology, biogeography, and evaluation of dormancy and germination. San Diego, CA: Academic Press.
Baskin, J. M. and Baskin, C. C. 1985. The annual dormancy cycle in buried weed seeds: a continuum. Bioscience. 25:492498.
Beckstead, J., Meyer, S. E., and Allen, P. S. 1996. Bromus tectorum seed germination: between-population and between-year variation. Can. J. Bot. 74:875882.
Benvenuti, S. and Macchia, M. 1997. Germination ecophysiology of bur beggarticks (Bidens tripartita) as affected by light and oxygen. Weed Sci. 45:696700.
Benvenuti, S., Macchia, M., and Miele, S. 2001. Quantitative analysis of emergence of seedlings from buried weed seeds with increasing soil depth. Weed Sci. 49:528535.
Chachalis, D. and Reddy, K. N. 2000. Factors affecting Campsis radicans seed germination and seedling emergence. Weed Sci. 48:212216.
Chauhan, B. S., Gill, G., and Preston, C. 2006. Influence of tillage systems on vertical distribution, seedling recruitment and persistence of rigid ryegrass (Lolium rigidum) seed bank. Weed Sci. 54:669676.
Davis, A. S., Cardina, J., and Forcella, F. et al. 2005. Environmental factors affecting seed persistence of annual weeds across the U.S. Corn Belt. Weed Sci. 53:860868.
D'Emden, F. H. and Llewellyn, R. S. 2004. No-till adoption and cropping issues for Australian grain growers. Page 108 in Fischer, T. ed. Fourth International Crop Science Conference. Brisbane, Australia: The Regional Institute Ltd.
DiTommaso, A. 2004. Germination behavior of common ragweed (Ambrosia artemisiifolia) populations across a range of salinities. Weed Sci. 52:10021009.
Fawcett, R. S. and Slife, F. W. 1978. Effects of field application of nitrate on weed seed germination and dormancy. Weed Sci. 26:594596.
Genstat 5 Committee. 1993. Genstat 5, Release 3 Reference Manual. Oxford, UK: Clarendon Press.
Ghorbani, R., Seel, W., and Leifert, C. 1999. Effects of environmental factors on germination and emergence of Amaranthus retroflexus . Weed Sci. 47:505510.
Gill, G. S. 1996. Why annual ryegrass is a problem in Australian agriculture. Plant Prot. Q. 11:193195.
Gramshaw, D. and Stern, W. 1977. Survival of annual ryegrass (Lolium rigidum Gaud.) seed in a Mediterranean type environment, II: effects of short-term burial on persistence of viable seed. Aust. J. Agric. Res. 28:93101.
Greenway, H. and Munns, R. 1980. Mechanisms of salt tolerance in nonhalophytes. Ann. Rev. Plant Physiol. 31:149190.
Heap, I. 2004. The International Survey of Herbicide Resistant Weeds.
Koger, C. H., Reddy, K. N., and Poston, D. H. 2004. Factors affecting seed germination, seedling emergence, and survival of texasweed (Caperonia palustris). Weed Sci. 52:989995.
Marcar, N. E. 1987. Salt tolerance in the genus Lolium (ryegrass) during germination and growth. Aust. J. Agric. Res. 38:297307.
Mennan, H. 2003. The effects of depth and duration of burial on seasonal germination, dormancy and viability of Galium aparine and Bifora radians seeds. J. Agron. Crop Sci. 189:304309.
Mennan, H. and Ngouajio, M. 2006. Seasonal cycles in germination and seedling emergence of summer and winter populations of catchweed bedstraw (Galium aparine) and wild mustard (Brassica kaber). Weed Sci. 54:114120.
Meyer, S. E. and Monsen, S. B. 1992. Big sagebrush germination patterns: subspecies and population differences. J. Range Manag. 45:8793.
Michel, B. E. 1983. Evaluation of the water potentials of solutions of polyethylene glycol 8000 both in the absence and presence of other solutes. Plant Physiol. 72:6670.
Milberg, P., Andersson, L., Elfverson, C., and Regner, S. 1996. Germination characteristics of seeds differing in mass. Seed Sci. Res. 6:191197.
Mohler, C. L. and Galford, A. E. 1997. Weed seedling emergence and seed survival: separating the effects of seed position and soil modification by tillage. Weed Res. 37:147155.
Peters, N. C. B. 1982. The dormancy of wild oat seed (Avena fatua L.) from plants grown under various temperature and soil moisture conditions. Weed Res. 22:205212.
Philippi, T. 1993. Bet-hedging germination of desert annuals: variation among populations and maternal effects in Lepidium lasiocarpum . Am. Nat. 142:488507.
Preston, C. 2000. Herbicide mode of action and herbicide resistance. Pages 209225 in Sindel, B. ed. Australian weed management systems. Meredith, Victoria: R. G. and F. J. Richardson.
Rengasamy, P. 2002. Transient salinity and subsoil constraints to dryland farming in Australian sodic soils: an overview. Aust. J. Exp. Agric. 42:351361.
Shaw, D. R., Mack, R. E., and Smith, C. A. 1991. Redvine (Brunnichia ovata) germination and emergence. Weed Sci. 39:3336.
Slattery, W. J., Conyers, M. K., and Aitken, R. L. 1999. Soil pH, aluminium, manganese and lime requirement. Pages 103128 in Peverill, K. I., Sparrow, L. A. and Reuter, D. J. eds. Soil analysis—an interpretation manual. Collingwood, Victoria, Australia: CSIRO Publishing.
Steadman, K. J., Bignell, G. P., and Ellery, A. J. 2003a. Field assessment of thermal after-ripening time for dormancy release prediction in Lolium rigidum seeds. Weed Res. 43:458465.
Steadman, K. J., Bignell, G. P., and Michael, P. J. 2004a. Stimulating dormancy release and emergence of annual ryegrass (Lolium rigidum) seeds using short-term hydrated storage in darkness. Aust. J. Agric. Res. 55:787795.
Steadman, K. J., Crawford, A. D., and Gallagher, R. S. 2003b. Dormancy release in Lolium rigidum seeds is a function of thermal after-ripening time and seed water content. Funct. Plant Biol. 30:345352.
Steadman, K. J., Ellery, A. J., Chapman, R., Moore, A., and Turner, N. C. 2004b. Maturation temperature and rainfall influence seed dormancy characteristics of annual ryegrass (Lolium rigidum). Aust. J. Agric. Res. 55:10471057.
Taylorson, R. B. 1970. Changes in dormancy and viability of weed seeds in soils. Weed Sci. 18:265269.
van Esso, M. L., Ghersa, C. M., and Soriano, A. 1986. Cultivation effects on the dynamics of a Johnsongrass seed population in the soil. Soil Tillage Res. 6:325335.
Van Mourik, T. A., Stomph, T. J., and Murdoch, A. J. 2005. Why high seed densities within buried mesh bags may overestimate depletion rates of soil seed banks. J. Appl. Ecol. 42:299305.
Watson, C. E. J. and Watson, V. H. 1982. Nitrogen and date of defoliation effects on seed yield and seed quality of tall fescue. Agron. J. 74:891893.
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Weed Science
  • ISSN: 0043-1745
  • EISSN: 1550-2759
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