Evidence for the association of homologous chromosomes during premeiotic stages inImpatiens andSalvia

Sequential analysis of meiotic prophase in grasshoppers.

“…Westergaard (1964) and Rossen and Westergaard (1966) also referred to a "precocious synapsis". More recent studies (Feldman 1966, Maguire 1968, Brown and Stack 1968, Chauman and Abel 1968, Stack and Brown 1969 support this hypothesis. In 1971, Stack studied the changes which were produced in the successive mitosis during the development of the plant Ornithogalum virens and defined them as premeiotic changes which gave the mito sis a gradual meiotic appearance, indicating that the homologous chromosome pairing, at least in this species, is a progressive phenomenon.…”

Chromosomal Differentiation inImpatiensL. (Balsaminaceae)

“…Heterochromatin was first noted (HEITZ 1929) in the garden balsam, Impatiens balsamina L., a widely cultivated ornamental belonging to the jewelweed family (Balsaminaceae). Heterochromatin has been recorded, primarily as chromocenters at interphase, in several additional species of Impatiens (SMITH 1934;BHATTACHARJYA 1954;CHAUHAN and ABEL 1968), but no observations have been carried out on eu-and heterochromatin of dividing chromosomes. This is unfortunate because Impatiens has undergone an extensive cytoevolution resulting in a series of chromosome numbers ranging from n = 3 ton = 33, and detailed karyotypes might provide considerable insight into the relationship between the genomes of different species and aggregates within the genus.…”

Composition of eukaryotic gene loci regarding gene conversion units and the presence or the absence of intralocus reciprocal recombination.

“…1983) are all done under the hesitative tone. However, since the publication on a possibility of general and regular occurrence of somatic homologous pairings in every interphase (Kitani, 1963), numerous findings to support this concept appeared both in premeiotic (ultimate) interphase (Chauhan and Abel, 1968;Bowman and Rajhathy, 1977;Maguir, 1983) and somatic interphase (Feldman et al, 1966;Rao and Natarajan, 1967;Comings, 1968;wagenaar, 1969;Rieger, et al, 1973;Stack and Clark, 1973;Yoshida and Yamaguchi, 1973;Colombera and Cary, 1973;Vig, 1973;Diaz and Lewis, 1975;Svidchenko, 1975;Crozier, 1975;Singh, Robbelen and Okamoto, 1976;van Heemert, 1977;and Lacadena and Ferrer, 1978).…”