Invasive Species Compendium

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Abstract Full Text

Analysis of seed mass for assessment of seed production and homogeneity of agropopulation on the example of leuzea (Rhaponticum carthamoides (Willd.) Iljin.).


Seed productivity is an important indicator that depends on the growing conditions, the agricultural technology used, and also reflects the degree of adaptation of the introduced species in the new habitat. In order to clarify the seed production coefficient for different pollination types and to assess the homogeneity of the used agoropopulation of the leuzea (Rhaponticum carthamoides (Willd.) Iljin.), we used the mass of individual seeds as an objective measure of their plumpness. The research was carried out on experimental field of the Perm Research Institute of Agriculture in 2019-2020. A statistical analysis of the distribution of the mass of individual seeds has been carried out. It is shown that the distribution by mass of the totality of all plump seeds is close to normal (P> 0.99), due to which it is possible to establish an objective critical value of the mass of their attribution to plump seeds. Under natural conditions, the seeds of leuzea should have a mass of at least 9.0 mg. Measurement of the mass made it possible to classify as plump seeds a part of large, externally executed, but empty seeds, which made it possible to more correctly determine the seed productivity. The semenification coefficient for isolation from pollinating insects was 38.1%, with free pollination, including by honey bee - 91.1 and 93.1%. The average weight of completed seeds is influenced by weather conditions in different years (P <0.001). Protection of seeds from hatching by birds by tying the inflorescences with a nylon mesh leads to a decrease in the mass of seeds (P <0.001). The heterogeneity of the agropopulation by the weight of seeds was revealed, which is valuable for breeding and studying the inheritance of the trait.