Ectoparasites as mechanical and transmissive transmitting agents of infectious disease

Abstract

The purpose. To create and assess initial material of Lucerne on a complex of economic valuable attributes for further their use in selection process. Methods. Inbreeding, polycross-method and artificial crossing. They assessed plants grown in sandy substratum and field conditions. Results. Differentiation of synthetic selection material (S1 and S2) is made. They selected back-crossed and inbred progeny with the maximum productivity indexes, high level of morphological characteristics of root system: diameter of a root, its mass, volume of root system, and nitrogenase activity. Inbreeding in the second generation irrespective of constitution of root system of initial forms promoted increase of number of plants with rod-branched root system. Factorial attributes which can be used as criteria of selection on productivity of azotfixation are specified. Conclusions. Comprehensive assessment of collection material in conditions of irrigation has allowed to select forms which are of interest for selection of new high-yielding varieties of Lucerne with different attributes and properties, includinghigh symbiotic azotfixation. Marker attributes are determined which at the first stages of selection process allow to take forms with the maximum indexes of azotfixation.