Morphometric trait manifestation in inbred lines of monogerm beetroot (Beta vulgaris L.)

Abstract

Relevance. Inbreeding is the most widespread method of obtaining starting breeding material and plays a central role in heterosis breeding programs of most crops. Beetroot inbred lines possessing economically valuable characteristics require constant maintenance via self-pollination. However, self-pollination leads to depression of a number of traits. Thorough theoretical studies and practical developments are needed to preserve valuable beetroot lines. We aimed to study the root and leaf rosette variability resulting from beetroot self-pollination. We also investigated the inheritance of monogermity in beetroots.
Materials and methods. Experimental work was carried out at the All-Russian Research Institute of Vegetable Growing – branch of the Federal State Budgetary Scientific Institution "Federal Scientific Vegetable Center" (FSBSI FSVC), 2011-202], Moscow Region. The object of the study was inbred beetroot lines originated from beetroots of foreign selection. The research data were obtained via field observations and measurements.
Results. It has been experimentally shown that the constant signs of self-pollinated beet lines of 1 year of life are the position and height of the leaf rosette. Stabilization and maintenance of separate fertility at a high level is carried out by selection. A negative correlation was noted between the signs of the degree of separateness and the height of the leaf rosette of the plant, the proportion of the neck of the root crop in its diameter, the mass of the root crop and the proportion of the root crop in the biomass of the plant in the offspring of the fourth generation of the inbreeding. The decrease in the productivity of the seed plant occurs at the beginning of the process of creating self-pollinated lines – in the first generation.