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Crop Science Abstract - Crop Breeding & Genetics

Evaluation of Near-Isogenic Lines for Three Height-Reducing Genes in Hard Red Spring Wheat


This article in CS

  1. Vol. 52 No. 3, p. 1145-1152
    Received: Nov 28, 2011

    * Corresponding author(s): usslt@montana.edu
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  1. S. P. Lanninga,
  2. J. M. Martina,
  3. R. N. Stougaardd,
  4. F. R. Guillen-Portale,
  5. N. K. Blakea,
  6. J. D. Shermana,
  7. A. M. Robbins,
  8. K. D. Kephartc,
  9. P. Lambb,
  10. G. R. Carlsonb,
  11. M. Pumphreyf and
  12. L. E. Talbert *a
  1. a Plant Sciences and Plant Pathology Dep., Montana State Univ., Bozeman, MT 59717
    d Northwestern Agric. Res. Center, 4570 Montana 35, Kalispell, MT 59901
    e Sustainable Oils, LLC, 214 Shepherd Trail, Suite F, Bozeman, MT 59718
    c Southern Agric. Res. Center, 748 Railroad Hwy., Huntley, MT 50037
    b Northern Agric. Res. Center, 3710 Assiniboine Rd., Havre, MT
    f Dep. of Crop and Soil Sciences, Washington State Univ., Pullman, WA 99164


The most common genes for semidwarf habit in modern wheat (Triticum aestivum L.) cultivars are found at the Rht-B1 and Rht-D1 loci on chromosomes 4B and 4D, respectively. An alternative gene for semidwarf habit, Rht8, has shown potential as a replacement for Rht-B1b and Rht-D1b in some environments. The objective of the present study was to assess the impact of the height-reducing gene Rht8 relative to Rht-B1b and Rht-D1b on performance of spring wheat in Montana and Washington environments characterized by terminal drought stress. Evaluation of near-isogenic lines developed in four genetic backgrounds showed that Rht-B1b, Rht-D1b, and Rht8 caused height reduction of 19, 20, and 6.5%, respectively, relative to wild-type near-isogenic lines over 12 environments. An increase in grain yield was associated with reduced height for lines containing Rht-B1b and Rht-D1b based on means over the four genetic backgrounds and 10 environments. Height reduction and yield increase associated with Rht-B1b and Rht-D1b were significant in most environments. Lines with Rht8 yielded less than wild-type based on means over environments and in 3 of 10 individual environments. Reduced height lines with Rht-B1b and Rht-D1b tended to have a higher harvest index and more seed per spike than wild-type lines and reduced height lines with Rht8. In sum, our results suggest that Rht-B1b and Rht-D1b are superior to Rht8 as a source for height reduction for spring wheat in the tested environments.

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