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EVALUATION OF NEW SELF-POLLINATED CORN LINES BASED ON DIFFERENT GENETIC PLASM IN TERMS OF PRODUCTIVITY AND ITS COMPONENTS

EVALUATION OF NEW SELF-POLLINATED CORN LINES BASED ON DIFFERENT GENETIC PLASM IN TERMS OF PRODUCTIVITY AND ITS COMPONENTS

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Date posted online

19.12.2015

Institution

Plant Production Institute nd. a V. Ya. Yuriev of NAAS

Bibliography

Section

SOURCES AND DONORS

Abstract

Goal. The goal was to determine the productivity level and its components in new promising corn lines within the germplasm as well as to identify valuable acessions for further use in breeding programs.

Matherials and Methods. The investigations were carried out in the fields of the Laboratory of Corn Breeding and Seed Production of the Plant Production Institute nd. a VYa Yuriev of NAAS in 2005-2011. The field surveys and laboratory analyzes were performed by the conventional methods of field and laboratory studies on corn. The experimental data were processed using cluster analysis.

Results. During 2005-2011 at the Plant Production Institute nd. a VYa Yuriev of NAAS the range of productivity fluctuations within 5 groups of germplasms in 49 new self-pollinated corn lines was studied. To differentiate lines by productivity and its components, we used cluster analysis. Cauterization was conducted in terms of the following traits: plant productivity, kernel number per ear, and 1000-grain weight. It was found that most of lines (63.2%) belonging to Lancaster plasm in this sample had a medium productivity formed by a medium 1000-grain weight and a large number of kernels per ear. The distribution of sister lines of Lancaster plasm into clusters provides an opportunity to highlight lines with various levels of productivity within a group and to analyze ways of their formation. This approach provides an opportunity to select source material within a sample, distinguishing the best accessions by certain characteristics, and subsequently to use them for improvement of elite lines that are part of promising hybrids or zoned hybrids. It was noted that the line group created with a specific plasm only comprised high-yielding lines  (33%) and medium-yielding lines (67%) with a very large (75%) and large (25%) kernel number per ear. High productivity in lines of this group was formed as a result of combination of a very large kernel number per ear and medium 1000-grain weight.

Conclusions. The efficiency of differentiation of self-pollinated corn lines by cluster analysis in terms of productivity and its elements within germplasm was proved. The ways of formation of productivity in lines of different genetic origin were defined. Sources of valuable economic traits were identified. Test crosses marked identified high-yielding hybrids, which were included in the program for further studies in a promising hybrid nursery.

Keywords

corn, line, genetic plasm, productivity, hybrid