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Near-isogenic lines for Triticum aestivum height and crop competitiveness

Published online by Cambridge University Press:  12 June 2017

Steven S. Seefeldt ,
Alex G. Ogg Jr.  and
Yuesheng Hou
Alex G. Ogg Jr.
Affiliation:
National A. cylindrica Research Program, P.O. Box 53, Ten Sleep, WY 82442
Yuesheng Hou
Affiliation:
Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164
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Extract

Near isolines of ‘Nugaines’ winter Triticum aestivum that differed in height were planted with and without Aegilops cylindrica to determine the effect of plant height on competition against A. cylindrica. The isolines had either reduced height gene Rht1, Rht2, Rht1 plus Rht2, or neither Rht genes and averaged 79, 77, 51, and 101 cm tall, respectively, when grown with or without competition from A. cylindrica. Plants with fewer reduced height genes had the faster rates of height and weight gain, which are important traits for enhanced competitiveness. When growing in competition with A. cylindrica, the shortest isoline allowed the greatest amount of A. cylindrica seed production but did not have the lowest T. aestivum yield. However, when compared to the A. cylindrica-free control, the shortest isoline had the greatest percent yield loss. The tallest isoline reduced A. cylindrica seed production the most, and T. aestivum yield reduction due to A. cylindrica on a percent basis was the least when averaged over 2 yr. When competing against A. cylindrica, the tallest isoline did not always have the largest yield and yield parameters, and the shortest isoline did not always have the smallest yield and yield parameters. There is a cost to the T. aestivum plant to produce extra stem biomass that may reduce yield potential of taller plants and reduce the advantage gained by being taller than the surrounding weeds.

Keywords

BromoxynildiclofopthifensulfurontribenuronAegilops cylindrica Host AEGCY, jointed goatgrassTriticum aestivum L., winter wheatGrowth rateyieldisolinesAEGCY
Type
Weed Biology and Ecology
Information
Weed Science , Volume 47 , Issue 3 , June 1999 , pp. 316 - 320
Copyright
Copyright © 1999 by the Weed Science Society of America 

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