Premium
Cytogenetic study of Helianthus laevigatus and its F 1 and BC 1 F 1 hybrids with cultivated sunflower, Helianthus annuus
Author(s) -
Atlagić J.,
Š Korić D.
Publication year - 1999
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1046/j.1439-0523.1999.00423.x
Subject(s) - helianthus annuus , sunflower , biology , hybrid , helianthus , botany , interspecific hybridization , agronomy , horticulture
Although the wild sunflower species Helianthus laevigatus has not been extensively studied it may be considered for sunflower breeding as a potential source of desirable genes for Sclerotinia stalk rot resistance and high contents of proteins and linoleic acid in the seed. A set of six H. laevigatus populations was crossed to cultivated sun~ower lines and produced nine F 1 (2‐14 plants) and 66 BC 1 F 1 hybrid combinations (1‐13 plants). Male sterility occurred in F 1 and BC 1 F 1 hybrid combinations and pollen viability was lower in the progenies than in the parents (51.6‐77.2%in F 1 and in F 1 and 4.8‐34.0% in BC 1 F 1 ). Meiosis was normal in the H. laevigatus populations It was found that this tetraploid species also occurred in a hexaploid form Numerous irregularities were observed in the meiosis of the F 1 interspecific hybrids During diakinesis, quadrivalents and hexavalents were recorded in addition to bivalents Dislocated chromosomes and chromosome bridges were present in the other phases The chromosome number in F 1 was 68 (tetraploid). Irregularities in chromosome pairing were observed in the interspecific hybrids at BC 1 F 1 . There were many univalents, and trivalents quadrivalents and hexavalents were also present The chromosome number in the BC 1 F 1 generation ranged from 34 to 60. The occurrence of meiotic irregularities in the F 1 and BC 1 F 1 interspecific hybrids indicates that H. laevigatus and the cultivated sunflower differ in genome constitution.