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This article in CS

  1. Vol. 52 No. 3, p. 1153-1161
     
    Received: June 20, 2011
    Published: May, 2012


    * Corresponding author(s): david.r.jordan@deedi.qld.gov.au
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doi:10.2135/cropsci2011.06.0326

The Relationship Between the Stay-Green Trait and Grain Yield in Elite Sorghum Hybrids Grown in a Range of Environments

  1. D. R. Jordan *a,
  2. C. H. Huntb,
  3. A. W. Cruickshankc,
  4. A. K. Borrella and
  5. R.G. Henzellc
  1. a The University of Queensland, Queensland Alliance for Agriculture & Food Innovation Hermitage Research Facility, Yangan Rd., Warwick, QLD 4370, Australia
    b Agri-Science Queensland, Tor St., Toowoomba, QLD 4350, Australia
    c Agri-Science Queensland, Hermitage Research Station, Yangan Rd., Warwick, QLD 4370, Australia

Abstract

The stay-green drought adaptation mechanism has been widely promoted as a way of improving grain yield and lodging resistance in sorghum [Sorghum bicolor (L.) Moench] and as a result has been the subject of many physiological and genetic studies. The relevance of these studies to elite sorghum hybrids is not clear given that they sample a limited number of environments and were conducted using inbred lines or relatively small numbers of experimental F1 hybrids. In this study we investigated the relationship between stay-green and yield using data from breeding trials that sampled 1668 unique hybrid combinations and 23 environments whose mean yields varied from 2.3 to 10.5 t ha−1. The strength and direction of the association between stay-green and grain yield varied with both environment and genetic background (male tester). The majority of associations were positive, particularly in environments with yields below 6 t ha−1. As trial mean yield increased above 6 t ha−1 there was a trend toward an increased number of negative associations; however, the number and magnitude of the positive associations were larger. Given that post-flowering drought is very commonly experienced by sorghum crops world wide and average yields are 1.2 and 2.5 t ha−1 for the world and Australia, respectively, our results indicate that selection for stay-green in elite sorghum hybrids may be broadly beneficial for increasing yield in a wide range of environments.

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Copyright © 2012. Copyright © by the Crop Science Society of America, Inc.