View More View Less
  • 1 Agriculture and Agrifood Semiarid Prairie Agricultural Research Centre Saskatchewan Canada
Restricted access

Cross Mark

The low seedling vigour of Russian wildrye grass ( Psathyrostachys juncea ) (RWR) limits its use. Shading from durum wheat ( Triticum turgidum ) reduced RWR leaf number, tiller number, leaf area and seedling dry weight in a growth room experiment. Treatments with similar shading differed in tiller number and dry weight, which suggested that light quality may have also contributed to these responses. In a second growth room experiment, light intensity (PAR) and red:far-red light ratio (670:730 nm) were altered by coloured plastic filters suspended above seedlings of Russian wildrye, crested wheatgrass ( Agropyron desertorum ) (CWG) and Dahurian wildrye grass ( Elymus dahuricus ) (DWR). Leaf area, tiller number and dry weight of RWR seedlings were reduced by declining red:far-red light ratio while light intensity differences at similar red:far-red ratio did not affect these variables. CWG exhibited similar responses to declining red:far-red light ratio as RWR, except that it exhibited a seedling weight response to light intensity. DWR tiller number was not responsive to low red:far-red light ratio but rather to low light intensity. However, DWR seedling weight, tiller weight and leaf area were responsive to declining red:far-red light ratio. These results indicate that RWR seedlings are sensitive to light quality changes caused by neighbouring plants.

  • Alderson J., Sharp, W. C. (1994): Grass Varieties in the United States . USDA-ARS. Handbook No. 170, Washington, DC. 296 p.

  • Ballare, C. L., Scopel, A. L., Sanchez, R. A. (1997): Foraging for light: photosensory ecology and agricultural implications. Plant Cell Environ. , 20 , 820–825.

    Sanchez R. A. , 'Foraging for light: photosensory ecology and agricultural implications ' (1997 ) 20 Plant Cell Environ. : 820 -825.

    • Search Google Scholar
  • Barnes, C., Bugbee, B. (1991): Morphological responses of wheat to changes in phytochrome equilibrium. Plant Physiol. , 97 , 359–365.

    Bugbee B. , 'Morphological responses of wheat to changes in phytochrome equilibrium ' (1991 ) 97 Plant Physiol. : 359 -365.

    • Search Google Scholar
  • Berdahl, J. D., Ries, R. E. (1997): Development and vigor of diploid and tetraploid Russian wildrye seedlings. J. Range Manage. , 50 , 80–84.

    Ries R. E. , 'Development and vigor of diploid and tetraploid Russian wildrye seedlings ' (1997 ) 50 J. Range Manage. : 80 -84.

    • Search Google Scholar
  • Casal, J. J., Sanchez, R. A., Deregibus, V. A. (1987): Tillering responses of Lolium multiflorum plants to changes of red/far-red ratio typical of sparse canopies. J. Exp. Bot. , 38 , 1432–1439.

    Deregibus V. A. , 'Tillering responses of Lolium multiflorum plants to changes of red/far-red ratio typical of sparse canopies ' (1987 ) 38 J. Exp. Bot. : 1432 -1439.

    • Search Google Scholar
  • Casal, J. J., Sanchez, R. A., Gibson, D. (1990): The significance of changes in the red/far-red ratio, associated with either neighbour plants or twilight, for tillering in Lolium multiflorum Lam. New Phytol. , 116 , 565–572.

    Gibson D. , 'The significance of changes in the red/far-red ratio, associated with either neighbour plants or twilight, for tillering in Lolium multiflorum Lam ' (1990 ) 116 New Phytol. : 565 -572.

    • Search Google Scholar
  • Casal, J. J., Smith, H. (1989): The function, action, and adaptive significance of phytochrome in light-grown plants. Plant, Cell Environ. , 12 , 855–862.

    Smith H. , 'The function, action, and adaptive significance of phytochrome in light-grown plants ' (1989 ) 12 Plant, Cell Environ. : 855 -862.

    • Search Google Scholar
  • Dodd, M. B., McGowan, A. W., Power, I. L., Thorrold, B. S. (2005): Effects of shade level, shade duration and light quality on perennial pastures. New Zealand J. Agr. Res. , 48 , 531–543.

    Thorrold B. S. , 'Effects of shade level, shade duration and light quality on perennial pastures ' (2005 ) 48 New Zealand J. Agr. Res. : 531 -543.

    • Search Google Scholar
  • Evers, J. B., Vos, J., Andrieu, B., Struik, P. C. (2006): Cessation of tillering in spring wheat in relation to light interception and red:far-red ratio. Ann. Bot. , 97 , 649–658.

    Struik P. C. , 'Cessation of tillering in spring wheat in relation to light interception and red:far-red ratio ' (2006 ) 97 Ann. Bot. : 649 -658.

    • Search Google Scholar
  • Holt, N. W. (1996): Russian Wildrye for Pasture . Grazing and Pasture Technology Program, Agriculture and Agri-Food Canada, and Saskatchewan Agriculture and Food (co-publishers). Regina, SK. 11 p.

  • Jefferson, P. G. (1993): Seedling growth analysis of Russian wildrye. Can. J. Plant Sci. , 73 , 1009–1015.

    Jefferson P. G. , 'Seedling growth analysis of Russian wildrye ' (1993 ) 73 Can. J. Plant Sci. : 1009 -1015.

    • Search Google Scholar
  • Lawrence, T., Ratzlaff, C. D. (1985): Evaluation of fourteen grass populations as forage crops for southwestern Saskatchewan. Can. J. Plant Sci. , 65 , 951–957.

    Ratzlaff C. D. , 'Evaluation of fourteen grass populations as forage crops for southwestern Saskatchewan ' (1985 ) 65 Can. J. Plant Sci. : 951 -957.

    • Search Google Scholar
  • Leyshon, A. J., Campbell, C.A. (1992): Effect of timing and intensity of first defoliation on subsequent production of 4 pasture species. J. Range Manage. , 45 , 379–384.

    Campbell C.A. , 'Effect of timing and intensity of first defoliation on subsequent production of 4 pasture species ' (1992 ) 45 J. Range Manage. : 379 -384.

    • Search Google Scholar
  • McLeod, J. G., Jefferson, P. G., Muri, R., Lawrence, T. (2003): Tom, Russian wildrye. Can. J. Plant Sci. , 83 , 789–791.

    Lawrence T. , 'Tom, Russian wildrye ' (2003 ) 83 Can. J. Plant Sci. : 789 -791.

  • Schaaf, H. M. (1961): Effect of planting date on seed production in Russian wildrye (Elymus junceus Fisch.). Agron. J. , 53 , 353–354.

    Schaaf H. M. , 'Effect of planting date on seed production in Russian wildrye (Elymus junceus Fisch.) ' (1961 ) 53 Agron. J. : 353 -354.

    • Search Google Scholar
  • Skinner, R. H., Simmons, S. R. (1993): Modulation of leaf elongation, tiller appearance and tiller senescence in spring barley by far-red light. Plant. Cell Environ. , 16 , 555–562.

    Simmons S. R. , 'Modulation of leaf elongation, tiller appearance and tiller senescence in spring barley by far-red light ' (1993 ) 16 Plant. Cell Environ. : 555 -562.

    • Search Google Scholar
  • Smith, H., Casal, J. J., Jackson, G. M. (1990): Reflection signals and the perception by phytochrome of the proximity of neighbouring vegetation. Plant, Cell Environ. , 13 , 73–78.

    Jackson G. M. , 'Reflection signals and the perception by phytochrome of the proximity of neighbouring vegetation ' (1990 ) 13 Plant, Cell Environ. : 73 -78.

    • Search Google Scholar
  • Steel, R. G. D., Torrie, J. H., Dickey, D. A. (1997): Principles and Procedures of Statistics. A Biometrical Approach . 3rd ed. McGraw-Hill Book Co., New York (NY). 666 p.

    Dickey D. A. , '', in Principles and Procedures of Statistics. A Biometrical Approach , (1997 ) -.

  • Wherley, B. G., Gardner, D. S., Metzger, J. D. (2005): Tall fescue photomorphogenesis as influenced by changes in the spectral composition and light intensity. Crop Sci. , 45 , 562–568.

    Metzger J. D. , 'Tall fescue photomorphogenesis as influenced by changes in the spectral composition and light intensity ' (2005 ) 45 Crop Sci. : 562 -568.

    • Search Google Scholar
All Time Past Year Past 30 Days
Abstract Views 10 10 0
Full Text Views 13 7 0
PDF Downloads 7 5 0