Knowledge of phylogenetic relatedness and cytogenetic characteristics can facilitate breeding programs and interspecific hybridization in ornamentals. In this study genetic relationships, genome sizes and chromosome numbers were determined in a collection of 82 lavender genotypes, including 15 hybrids. Amplified Fragment Length Polymorphism (AFLP) marker analysis revealed 5 clusters, corresponding to the sections Lavandula, Stoechas, Dentatae, Pterostoechas and Subnudae. Genome sizes varied between 0.76 ± 0.02 pg 2C−1 and 4.80 ± 0.06 pg 2C−1 and chromosome numbers ranged from 2n = 22 to 2n = 100. Genome sizes of hybrids were intermediate to the progenitors genome sizes. All analyzed hybrid genotypes were characterized by even chromosome numbers, with 2n = 48 or 50. Using Principal Coordinate Analysis (PCoA) separate hybrid clusters were identified between the progenitor species clusters. Polyploidy and/or aneuploidy was observed in two hybrids genotypes: L. × intermedia ‘Heavenly Angel’ (2n = 100) and L. × heterophylla ‘Big Boy James’ (2n = 66). Results obtained in this study can be used to predict cross compatibility among different species, thus enabling targeted breeding towards the creation of new improved Lavandula cultivars.
|Translated title of the contribution||Bepaling van genetische afstand, genoomgrootte en aantal chromosomen van lavendel ter ondersteuning van de veredeling.|
|Number of pages||14|
|Publication status||Published - 28-Oct-2021|