Differential anaphase-I behaviour between wheat and rye univalents in triticale-wheat hybrid plants

Abstract

The chromosomes of the D genome of wheat and the genome R of rye can be distinguished at meiosis by C-banding in triticale-wheat hybrid plants. All members of both genomes almost exclusively formed univalents at metaphase I. However, at anaphase I the frequencies of equationally dividing chromosomes were higher for rye than for wheat chromosomes. The differential centromere behaviour at anaphase I is ascribed to differences in the time at which wheat and rye univalents are formed during the first meiotic prophase.

Cytomorphological characterization of diploid and triploid individuals ofOrchis × gennariiReichenb. fil. (Orchidaceae)

“…X gennarii supports the hypothesis of meiotic non-reduction which is reported to be more frequent in plants showing high rates of univalents at meiosis (HARLAN and DE WET 1975;GIRALDEZ and LACADENA 1976;BENAVENTE and ORELLANA 1986;PIGNONE 1993). In this case one has to hypothesize that 0.…”

Characterization of interploid hybrids from crosses between Brassica juncea and B. oleracea and the production of yellow-seeded B. napus

“…3n, 40 elements counted). Sister chromatid disjunction of univalent chromosomes at AI is a widely reported meiotic abnormality in wheat, Begonia, Vigna hybrids, Citrus hybrids and other plants, but it has scarcely been mentioned for Brassica species (Aragon-Alcaide et al 1997;Dewitte et al 2010;Benavente and Orellana 1986;Del Bosco et al 1999). This phenomenon may arise spontaneously at a low frequency, or it may be caused by genetic factors (Del Bosco et al 1999;Dewitte et al 2010;Clayberg 1959;Chelysheva et al 2005).…”