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Crop Science Abstract -

Stability of Morphological Traits Conferring Bird Resistance to Sunflower across Different Environments


This article in CS

  1. Vol. 31 No. 4, p. 997-1000
    Received: May 16, 1990

    * Corresponding author(s):
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  1. P. L. Gross and
  2. J. J. Hanzel 
  1. Dep. of Plant Pathology, North Dakota State Univ., Fargo, ND 58105-5012



Bird depredation is a major concern of sunflower (Helianthus annuus L.) producers wherever the crop is grown in the world. Development of bird-resistant varieties would provide an economical, environmentally safe method of contending with the problem. Morphological traits that confer resistance to depredation by birds have been identified. These traits include long involucral bracts, horizontally oriented heads, concave heads, and long head-to-stem distances. The objective of this study was to determine the stability of the traits when cultured in different environments. Breeding lines BRS1, ND208, ND492, ND495, ND162, and ND223-16, which possess resistance traits, and seven susceptible counterparts, ND221, ND224, ND505, HA89, ND581, ND223-1, and ND223-3, were grown at three locations in North Dakota in 1988 and 1989. Measurements of the traits were made at the R7 stage of development. Genotype, environment, and genotype ✕ environment effects were all significant (P < 0.05). The genotype ✕ environment interaction effects, however, were not the result of changes in rank between resistant and susceptible genotypes, but represented differences in magnitude of response in the genotypes when grown in diverse environments. Results of this study indicate that performance of hybrids possessing these traits can be expected to be stable across a wide geographical area.

Research was funded by Cooperative Agreement no. 12-34-41-0020 with USDA-APHIS-S&T.

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Copyright © 1991. Crop Science Society of AmericaCopyright © 1991 by the Crop Science Society of America, Inc.