INVESTIGATION ON THE INHERITANCE OF THE TRAITS NUMBER OF SEEDS PER PLANT AND 1000 KERNEL WEIGHT IN SUNFLOWER HYBRIDS

The investigation was carried out during 2013 – 2016 at Dobrudzha Agricultural Institute – General Toshevo, Bulgaria. The traits number of seeds per plant and 1000 kernel weight are of primary importance; they influence the increase of yield. This investigation included 8 hybrid combinations and the parental forms involved in the crosses. The additive-dominant relations of the traits were analyzed through the ratio between the parameters d/a. In crosses 217А x 88R, 813A x 97R, 813A x 100R, and 2003A x 98R, super dominance according to the parental forms was observed. Higher number of seeds per plant and 1000 kernel weight were obtained in these hybrid combinations in comparison to the parental forms. Incomplete dominance of these traits was found in combinations 217 x RW666 and 217 x 138R

BREEDING OF SUNFLOWER (HELIANTHUS ANNUUS L.) AT DOBRUDZHA AGRICULTURAL INSTITUTE – GENERAL TOSHEVO

Dobrudzha Agricultural Institute – General Toshevo is the only breeding center of sunflower in Bulgaria. Since its establishement in 1951, over 50 varieties and hybrids of this crop have been developed here. More than 15 joint hybrids have been registered abroad, the result from cooperation with our European partners. The institute has a rich and variable collection of initial breeding materials. The methods we use in our breeding work are intraspecific, interlinear, interspecific and intergeneric hybridization, experimental mutagenesis, embryoculture, somaclonal variation, in vitro screening and selection. The methods for evaluation of resistance to economically important diseases and the parasite Orobanche have been adapted to the working conditions of the Institute. Morphological, biological, technological, biochemical and phytopathological characterizations of the released and registered hybrids and their parental lines have been made. Many new materials have been developed during the last decade, which possess valuable breeding properties. Over 6000 inbred lines are involved in the breeding work. Annually, 1400 new hybrid combinations are being tested in Bulgaria and abroad. Hybrids have been developed, which possess very good productivity and adaptability potential, and which have been registered in Bulgaria, EU and other foreign contries. Some foreign companies included our new hybrids (Velko, Veleka, Yana, Divna, Valin, etc.) in their catalogs and are successfully organizing their seed production and marketing in the respective countries. A new direction of our breeding is the devlopment of sunflower hybrids resistant to herbicides. Several hybrids - Enigma, Sunny imi, Desi, Viyani, Danaya, etc., are now within the system of official testing in Bulgaria and abroad. Their registration is forthcoming. The aim of this investigation was to present the current status and achievements of the breeding work on sunflower at DAI-General Toshevo during the last decade

HYBRIDIZATION BETWEEN CULTIVATED SUNFLOWER AND WILD SPECIES HELIANTHUS BOLANDERI A. GRAY

Interspecific hybridization was carried out between sterile analogues of cultivated sunflower lines with normal cytoplasm and wild annual Helianthus bolanderi accession E-009 from collection of DAIGeneral Toshevo. Hybrid plants were produced using classical breeding methods and the biotechnological method embryo rescue. The degree of crossability and the inheritance of some morphological traits were determined. The obtained F1 progenies were characterized from morphological and phytopathological point of view. Hybrid forms distinguished with resistance to stem canker, phoma and downy mildew were obtained. The hybrid plants, carriers of Rf genes for CMS Pet 1, could be used in sunflower breeding programs for developing restorer lines

hep-th/9412054 Combinatorial constructions of modules for infinite-dimensional Lie algebras, I. Principal subspace.

This is the first of a series of papers studying combinatorial (with no “subtractions”) bases and characters of standard modules for affine Lie algebras, as well as various subspaces and “coset spaces ” of these modules. In part I we consider certain standard modules for the affine Lie algebra ˆg, g:= sl(n + 1, C), n ≥ 1, at any positive integral level k and construct bases for their principal subspaces (introduced and studied recently by Feigin and Stoyanovsky [FS]). The bases are given in terms of partitions: a color i, 1 ≤ i ≤ n, and a charge s, 1 ≤ s ≤ k, are assigned to each part of a partition, so that the parts of the same color and charge comply with certain difference conditions. The parts represent “Fourier coefficients ” of vertex operators and can be interpreted as “quasi-particles” enjoying (two-particle) statistical interaction related to the Cartan matrix of g. In the particular case of vacuum modules, the character formula associated with our basis is the one announced in [FS]. New combinatorial characters are proposed for the whole standard vacuum ˆg-modules at level one