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Crop Science Abstract - Crop Ecology, Management & Quality

Susceptibility to Preharvest Sprouting of Chilean and Australian Elite Cultivars of Common Wheat

 

This article in CS

  1. Vol. 57 No. 1, p. 462-474
     
    Received: June 15, 2016
    Accepted: Oct 08, 2016
    Published: November 28, 2016


    * Corresponding author(s): aschwember@uc.cl
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doi:10.2135/cropsci2016.02.0138
  1. N. Jiméneza,
  2. D. Maresb,
  3. K. Mrvab,
  4. C. Lizanac,
  5. S. Contrerasa and
  6. A.R. Schwember *a
  1. a Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal. Casilla 306-22, Santiago, Chile
    b School of Agriculture and Wine, University of Adelaide, WAITE Campus, Glen Osmond, SA 5064, Australia
    c Instituto de Producción y Sanidad Vegetal, Facultad de Ciencias Agrarias, Universidad Austral de Chile. Campus Isla Teja s/n, Valdivia, Chile

Abstract

One of the main factors that negatively affect common wheat (Triticum aestivum L.) grain quality is preharvest sprouting (PHS). In some regions of Chile and Australia, PHS can result in economic losses from lower yields and flour quality as a consequence of grains exposed to rain prior to harvest. Twenty-three Chilean common wheat cultivars were characterized in two locations (central and southern Chile) using the falling number (FN) method, standard germination test, and visual sprouting for PHS screening in two experimental seasons (2013–2014 and 2014–2015). Similarly, 20 Australian wheat cultivars were compared in six seasons using germination index (GI) at harvest ripeness. In the Chilean study, there were high positive (GI and sprouting score [SS]) and negative (FNwet samples and SS) correlations between the PHS tests, suggesting that they are appropriate tools to differentiate the PHS response among the common wheat genotypes studied. There was a strong phenological stage and genotypic effect on PHS variation, and while most cultivars showed intermediate or susceptible PHS phenotype, ‘Konde’, ‘Kumpa’, and ‘Swindy’ exhibited PHS resistance. Likewise, the germination index of Australian cultivars ranged from high to intermediate. The effect of temperature on PHS susceptibility was investigated by comparing varieties in open field conditions and under polyethylene covers in Chile or by using different times of sowing in Australia. In both experiments, a positive correlation between temperature and susceptibility to PHS was observed, which was more pronounced in cultivars with intermediate PHS resistance.

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