Evaluation of certain Egyptian wheat cultivars against rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae) using biochemical and biophysical traits
Abstract
Sitophilus oryzae (L.) is the most destructive pest of stored wheat, and is widely distributed in tropical regions. In the present study, the susceptibility of 11 Egyptian wheat cultivars, including seven durum wheat and four bread wheat cultivars were evaluated against S. oryzae were on the basis of percentage of weight loss, and damaged grain. The comparison between tested wheat cultivars in respect to wheat biophysical traits (kernel weight, kernel hardness and moisture), and biochemical variants (starch, wet gluten and protein content) was assayed. The correlation between these biophysical and biochemical traits and the percentage of weight loss and damaged grain was estimated. The results revealed that bread wheat cultivars (Misr-1, Misr-2, Giza-171, and Gimmiza-10) were highly susceptible to S. oryzae infestation than durum wheat (Beni Sweaf-1, Beni Sweaf-3, Beni Sweaf-4, Beni Sweaf-5, Beni Sweaf-6, Sohag-3, and Sohag-5). The most susceptible cultivar was the bread wheat cultivar Gemmieza-10, and the most resistant was durum wheat cultivar Beni Sweaf-3. The tested cultivars significantly varied in there biophysical and biochemical traits. A significant positive correlation was observed between percentage of damaged grain and grains content of starch, and wet gluten. However, negative correlations were found in grain hardness index and percentage of damaged grain. Protein content, grain diameter, kernel weight, %moisture (a) and (b) did not show a significant correlation to damaged grain.
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