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This article in AJ

  1. Vol. 82 No. 3, p. 501-505
    Received: Dec 5, 1988

    * Corresponding author(s):
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Prediction of Time to Anthesis of a Selection of Sunflower Genotypes

  1. P. J. Goyne,
  2. A. A. Schneiter  and
  3. K. C. Cleary
  1. Q ueensland Dep. Primary Industries, Hermitage Res. Stn., via Warwick, Queensland 4370, Australia
    C rop Weed Sci. Dep., North Dakota State Univ., Fargo, 58105
    O akland, CA



Synchronization of anthesis of male and female sunflower (Helianthus annuus L.) inbreds to be crossed is important for successful hybrid seed production. The use of weather-related models, which predict anthesis dates in scheduling planting times could assist in this synchronization. The field plantings of 16 sunflower genotypes in locations from 32°51' S to 64°50' N lat. during 1982 and 1983 were used to develop an anthesis predictive model. This model which related mean daily screen temperature to daily rate of development accounted for genotypes classified into developmental response groups as very quick, quick, medium and slow. The model had satisfactory predictive ability when validated on independent data. The model requires refinement to account for temperature by photoperiod interactions when additional data are available.

Contribution from North Dakota Agric. Exp. Stn., Journal Article no. 1798.

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