View More View Less
  • 1 University of California Department of Botany and Plant Sciences Riverside CA 92521-0124 USA
Restricted access

Wild diploid goatgrass, Aegilops tauschii Coss., is the D-genome donor to hexaploid bread wheat. Goatgrass has been crossed with tetraploid durum wheat (Triticum turgidum var. durum L.) and hexaploid bread wheat (T. aestivum L. ssp. aestivum) to broaden the genetic base of bread wheat. We examined the contribution of main stem water-soluble carbohydrates (WSC) and current assimilates to grain yield in one goatgrass relative to those in one durum and four cultivars of bread wheat under well-watered and droughted field conditions across two years. Drought reduced grain yield and its components. Number of tillers per plant was higher in goatgrass, but 55% of tillers produced were sterile. Number of grains per spike was lower in goatgrass. Grain weight was the component severely limiting potential yield in goatgrass. Main stem WSC and concentration was lowest in goatgrass. Linear rate of grain growth in goatgrass was 20 and 17 mg spike−1 day−1 under well-watered and droughted conditions, whereas those in durum and bread wheats ranged from 55 to 73 and from 37 to 60 mg spike−1day−1, respectively. Current assimilates were the major source of carbon to fill the grains under both irrigation regimes. A large number of goatgrass accessions and adapted durum cultivars should be examined for grain yield and its components to identify promising accessions to be used in producing synthetics.

  • Boyko, E.V., Gill, K.S., Mickelson-Young, L., Nasuda, S., Raupp, W.J., Ziegle, J.N., Singh, S., Hassawi, D.S., Fritz, A.K., Namuth, D., Lapiton, N.L.V., Gill, B.S. 1999. A high-density genetic linkage map of Aegilops tauschii, the D-genome progenitor of bread wheat. Theor. Appl. Genet. 99:16–26.

    Gill B.S. , 'A high-density genetic linkage map of Aegilops tauschii, the D-genome progenitor of bread wheat ' (1999 ) 99 Theor. Appl. Genet. : 16 -26.

    • Search Google Scholar
  • Cox, J.S., Sears, R.G., Bequette, R.K. 1995. Use of winter wheat × Triticum tauschii backcross populations for germplasm evaluation. Theor. Appl. Genet. 90:571–577.

    Bequette R.K. , 'Use of winter wheat × Triticum tauschii backcross populations for germplasm evaluation ' (1995 ) 90 Theor. Appl. Genet. : 571 -577.

    • Search Google Scholar
  • Draper, N., Smith, H. 1981. Applied Regression Analysis. 2nd ed. John Wiley & Sons, New York, USA.

    Smith H. , '', in Applied Regression Analysis , (1981 ) -.

  • Dubcovsky, J., Dvorak, J. 2007. Genome plasticity a key factor in success of polyploid wheat under domestication. Science 316:1862–1866.

    Dvorak J. , 'Genome plasticity a key factor in success of polyploid wheat under domestication ' (2007 ) 316 Science : 1862 -1866.

    • Search Google Scholar
  • Ehdaie, B., Alloush, G.A., Madore, M.A., Waines, J.G. 2006. Genotypic variation for stem reserves and mobilization in wheat: II. Postanthesis changes in internode water-soluble carbohydrates. Crop Sci. 46:2093–2103.

    Waines J.G. , 'Genotypic variation for stem reserves and mobilization in wheat: II. Postanthesis changes in internode water-soluble carbohydrates ' (2006 ) 46 Crop Sci. : 2093 -2103.

    • Search Google Scholar
  • Kobata, T., Palta, J.A., Turner, N.C. 1992. Rate of development of postanthesis water deficits and grain filling of spring wheat. Crop Sci. 32:1238–1242.

    Turner N.C. , 'Rate of development of postanthesis water deficits and grain filling of spring wheat ' (1992 ) 32 Crop Sci. : 1238 -1242.

    • Search Google Scholar
  • Rafi, M.M., Ehdaie, B., Waines, J.G. 1992. Quality traits, carbon isotope discrimination and yield components in wild wheats. Ann. Bot. 69:467–474.

    Waines J.G. , 'Quality traits, carbon isotope discrimination and yield components in wild wheats ' (1992 ) 69 Ann. Bot. : 467 -474.

    • Search Google Scholar
  • Saini, H.S., Westgate, M.E. 2000. Reproductive development in grain crops during drought. Adv. Agron. 68:59–96.

    Westgate M.E. , 'Reproductive development in grain crops during drought ' (2000 ) 68 Adv. Agron. : 59 -96.

    • Search Google Scholar
  • Steel, R.G.D., Torrie, J.H., Dickey, D.A. 1997. Principles and Procedure of Statistics. A Biometrical Approach. 3rd ed. McGraw-Hill, New York.

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