Indices for grain morphometric assessment of hexaploid wheat species
Keywords:spherical thickness index, coarse-grained index, grain length, width and thickness, grain morphometric indices, Triticum petropavlovskyi, spheroidal wheat
Purpose. The article presents approaches to the effective use of the indices for grain morphometric assessment of hexaploid wheat species. The purpose of our research was to study the morphometric parameters (length, width and thickness) of grains and develop effective indices for grain parameters: roundness and size.
Methods. Four hexaploid samples of wheat were under research – two spring soft wheat varieties, one sample of the species Triticum petropavlovskyi (the most large-grained species among hexaploid) and the last one represented species T. spherococcum (has a spherical grain form). Grains’ morphometric indices were measured with the help of caliper and 10–20 plants were examined of each 2012, 2014, 2016 yield. The reliability of the obtained results was estimated in accordance with standard statistical processing.
Results. The introduced indexes had stable meanings along the years and practically did not depend on the conditions of cultivation, which makes them reliable for wheat samples evaluation, based on grain morphometric analysis. The clear tendency towards the difference between the indices of the first and the second grains in the spike was determined. Therefore, in order to optimize the number of measurements, we recommend to analyze grains of the second flower, where the grain characteristics are better expressed.
Conclusions. So, the study showed the efficiency in use of our indices to assess the shape and size of grains. The indices use will facilitate the effective selection of grain samples with the optimal parameters in the selection process and can be used in the special techniques development for the variety protection.
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