Research of the chromosome complementin helianthus L. Genus

Abstract

The present cytogenetic investigations that were carried out have established the karyotypes for the species Helianthus annuus L., variety Record (2n = 34) and for the species H. debilis Nutt, line 403 (2n = 34). The karyotype of H. debilis is of asymmetrical type, containing 3 groups of chromosomes, according to the new nomenclature of LEVAN et al. (1964). namely: The first group of metacentric chromosomes (10 pairs). The second group of submetacentric chromosomes with satellites (3 pairs). The third group of subtelocentric chromosomes (4 pairs). In the monogenic male sterile line LC-1 of H. annuus, an analysis on the development of meiosis was performed resulting in a rather frequent occurrence of multivalent associations at diakinesis and the first metaphase. © 1990, Taylor and Francis Group, LLC.