GENOME SIZE IN THREE SPECIES OF Glandularia AND THEIR HYBRIDS
Fecha
2019-12Autor
Ferrari, Maria Rosa
Greizerstein, Eduardo
Poggio, Lidia
Metadatos
Mostrar el registro completo del ítemResumen
In this work the relationship between genome size of Glandularia species and the meiotic
configurations found in their hybrids are discussed. Glandularia incisa (Hook.) Tronc.,
growing in two localities of Corrientes and Córdoba provinces, Argentina, with different
ecological conditions, showed inter-population variability of the 2C-value. The DNA content
found in the Corrientes locality (2.41 pg) was higher than that obtained in the Córdoba locality
(2.09 pg) which has more stressful environmental conditions than the former. These values
are statistically different from those that were found in Glandularia pulchella (Sweet) Tronc.
from Corrientes (1.43 pg) and in Glandularia perakii Cov. et Schn from Córdoba (1.47 pg).
The DNA content of the diploid F1 hybrids, G. pulchella × G. incisa and G. perakii × G. incisa,
differed statistically from the DNA content of the parental species, being intermediate
between them. Differences in the frequency of pairing of homoeologous chromosomes were
observed in the hybrids; these differences cannot be explained by differences in genome
size since hybrids with similar DNA content differ significantly in their meiotic behavior.
On the other hand, the differences in the DNA content between the parental species justify
the presence of a high frequency of heteromorphic open and closed bivalents and univalents
with different size in the hybrids.