GENOME SIZE IN THREE SPECIES OF Glandularia AND THEIR HYBRIDS

FERRARI MR; BOTTINI M.C.J., E.J. GREIZERSTEIN Y L. POGGIO; POGGIO LIDIA

JOURNAL OF BASIC &APPLIED GENETICS

INTA

Lugar: Buenos Aires; Año: 2019 vol. XXX p. 47 - 54

In this work the relationship between genome size of Glandularia species and the meioticconfigurations found in their hybrids are discussed. Glandularia incisa (Hook.) Tronc.,growing in two localities of Corrientes and Córdoba provinces, Argentina, with differentecological conditions, showed inter-population variability of the 2C-value. The DNA contentfound 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 valuesare 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 intermediatebetween them. Differences in the frequency of pairing of homoeologous chromosomes wereobserved in the hybrids; these differences cannot be explained by differences in genomesize 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 justifythe presence of a high frequency of heteromorphic open and closed bivalents and univalentswith different size in the hybrids.