REGULARITY OF MEIOSIS IN EARLY GENERATIONS IN HYBRIDS OF BREAD WHEAT WITH ARTIFICIAL SPELT
Journal Title: Вісник Одеського національного університету. Біологія - Year 2018, Vol 23, Issue 1
Abstract
Introduction. The study of meiosis in wheat-alien hybrids occupiess an important place in the introgressive hybridization of wheat. Purpose. The aim of the paper is to investigate regularity of meiosis in F1, F2 and BC1 hybrids of Triticum aestivum L. cv. Fantaziia odeska with wheat-alien amphiploid (T. dicoccum Schuebl. x Ae. tauschii Feld. et Kis.). Results. 42-chromosome PMC predominated in F1. The average number of bivalents in PMC in plants ranged from 16.7 to 19.2. Closed bivalents predominated. Multivalents were detected. The meiotic index was low (30.3-36.5 %). The main class of defective products of meiosis was represented by tetrads with micronuclei. Plants differed significantly in the frequency of polyade formation. No significant dependence between the level of chromosome pairing and the frequency of normal tetrads was detected. The F2 plants varied significantly in the pattern and level of chromosome pairing. The karyotype was stabilized, but multivalents awere detected. The meiotic index in plants ranged from 58.1 to 68.5 %. The pattern and level of chromosome pairing in BC1 were significantly higher than in F1 and F2. Depending on plant genotype the number of bivalents in the PMC was 19.3-20.8, and the closed bivalents 14.4-19.1. Multivalents were detected. The meiotic index of plants BC1 varied from 84.8 to 94.2 %. Among the anomalies, the tetrads with micronuclei are the most numerous, but the polyades and atypical tetrads were also observed. Conclusions. A high degree of chromosome homology of both parents is shown. The regularity of meiosis significantly improved from F1 to F2 and BC1. Normalization of chromosome pairing and meiotic index reflects the improvement of the meiosis regularity. Heterogeneity in the regularity of meiosis, depending on the genotype of the plant is observed. The level of chromosome pairing is not the only factor determining the regularity of meiosis in hybridization of bread wheat with wheat-alien amphiploid. Anomalies in the functioning of the mitotic spindle significantly contribute to the irregularity of meiosis.
Authors and Affiliations
О. L. Sechnуak
Keywords
Related Articles
- EP ID EP502796
- DOI 10.18524/2077-1746.2018.1(42).129125
- Views 59
- Downloads 0
THE INTER-ANNUAL CHANGES OF THE QUANTITATIVE AND BIOMASS INDICES OF MUSSELS MYTILUS GALLOPROVINCIALIS Lam. AND MYTILASTERS MYTILASTER LINEATUS Gmel. IN THE PERIPHYTON SETTLEMENTS NEAR ODESA COAST OF THE BLACK SEA
The inter-annual dynamics of the abundance and the biomass of mussels Mytilus galloprovincialis (Lamarck, 1819) and mytilasters Mytilaster lineatus (Gmelin, 1791) in the periphyton settlements on the concrete traverses i...
INFLUENCE OF PHYSICAL AND EMOTIONAL ACTIVITY ON THE METABOLIC PROFILE OF BLOOD SERUM OF DRESSAGE HORSES OF THE UKRAINIAN RIDING BREED
Efficiency of use of a dressage horse is caused by a complex of factors. Special attention is paid to the state of health of a horse and its ability to recover after physical activity (training) and emotional loading (st...
ANTIOXIDANT STATUS OF RAPANA TISSUES UNDER STRESS CAUSED BY COPPER IONS
Rapana venosa is widely spread in the world's oceans and has adapted well to the conditions of different pollution. The study of adaptation options of Rapana was the purpose of this work. We studied the antioxidant syste...
BIOINFORMATIC ANALISIS OF NUCLEOTIDE SEQUENCES OF DWARFING GENES Rht-B1 AND Rht-D1
Introduction. Dwarfing Rht-B1 and Rht-D1 genes have been used in world breeding programs since 1960s and have significant direct and pleiotropic effects on wheat plants growth and development. The aim of our work was to...
CHARACTERISTICS OF THE INITIAL STAGE OF VEGETATION DEMUTATION IN FALLOWS UNDER THE DONETSK REGION
The article considers the changes in species composition of herbage and projective cover in the areas taken out of agricultural use of various ages. The ecological certification (by the method of L. Belgard), makes it po...