Showing papers by "Lidia Poggio published in 1994"
TL;DR: The results suggest that the differences in DNA content among species could be attributed, at least in part, to differences in heterochromatin content.
Abstract: The karyotypes and total DNA content of four species of grain amaranths (A. caudatus 2n=32, A. cruentus 2n=34, A. hypochondriacus 2n=32 and A. mantegazzianus 2n=32) werc studied. The results indicate that these kind of studies allow the differenciation of grain species of Amaranthus. There are differences in the karyotype formulae and asymmetry indexes A1 and A2. One pair of chromosomes with a satellite is present in the four species. The Ag-Nor staining reveals a maximum of two nucleoli per cell in mitotic interphase and one nucleolus in young meiocites. A. mantegazzianus (2C=1.46±0.015pg) and A. caudatus (2C=1.35±0.013pg) have significant differences in DNA content between them, and with the other two species, while A. cruentus (2C=1.26±0.013pg) and A. hypochondriacus (2C=1.26±0.018pg) do no differ significantly. The species with higher DNA content (A. mantegazzianus and A. caudatus) have C+ bands in most of the chromosomes, and the species with lower DNA content show C+ blocks only in few chromosomes. The results suggest that the differences in DNA content among species could be attributed, at least in part, to differences in heterochromatin content.
36 citations
TL;DR: Chromosome pairing studies showed important inter-population differences in the frequency of closed bivalents and chiasmata and the existence of polymorphism for C-banding pattern.
Abstract: The karyotypes and chromosome pairing of three populations (Argentina, Hungary and Libya) and two cultivars (Budakalasie-Hungary- and Hrubicki-Poland-) of Coriandrum sativum L (Umbelliferae) (2n=22) were studied. Slight differences were found between the karyotype formulae as well as the total chromosome length and volume among several of the plants investigated. A microsatellite in the short arm of a st chromosome (the largest one) and a maximum number of two nucleoli per cell were observed in the five populations. The results show the existence of polymorphism for C-banding pattern. Chromosome pairing studies showed important inter-population differences in the frequency of closed bivalents and chiasmata.
4 citations