Volga Region Farmland (Dec 2020)
SEARCH FOR THE SELECTION CRITERIA IN THE PROCESS OF SPRING BARLEY BREEDING IN DIFFERENT YEARS OF MOISTURE AVAILABILITY
Abstract
Variations in the elements of the yield structure and correlation relationships between them were studied using hybrids of spring barley of generations F1 and F2. The goal of the study is to search for effective selection criteria for productivity of a head and a plant in the process of spring barley breeding. Field experiments were carried out on chernozems of the forest-steppe of the Middle Volga region in years contrasting in the hydrothermal regime. The height of plants, Khoz of the main head and Khoz of the main shoot were consistently characterized by a low coefficient of variation (up to 10%), productive tillering, grain weight of the main head, Khoz of a plant by average (10-20%). The variability of the other studied elements of the yield structure varied from low to average. In the year with sufficient moisture, three relatively separate correlational constellations appeared: productivity of the main head, productivity of the plant, Khoz, as well as almost independent trait of “weight of 1000 grains”. In the dry year, there was a redefinition of the correlations between the elements, a conjugation between the characteristics of different constellations, and an increase of contribution to the productivity of indices of weight of 1000 grains and Khoz. The conclusion is made about the influence of various selection criteria on the productivity of barley under favorable and arid conditions. Under favorable conditions, it is necessary to select by the length of the main head and the number of grains in it. In a dry year, the weight of 1000 grains and indicators of Khoz acquire special importance, which are an independent goal of breeding under any conditions. When selecting breeding lines and selecting parental forms for crosses, it is necessary to rely on data obtained in years with contrasting weather conditions.
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