scholarly journals THE FINE STRUCTURE OF MEIOTIC CHROMOSOME PAIRING IN THE TRIPLOID, LILIUM TIGRINUM

1969 ◽  
Vol 40 (1) ◽  
pp. 273-279 ◽  
Author(s):  
Peter B. Moens
Keyword(s):  
Fine Structure ◽  
Chromosome Pairing ◽  
Meiotic Chromosome ◽  
Meiotic Chromosome Pairing

The Fine Structure of Meiotic Chromosome Pairing in Natural and Artificial Lilium Polyploids

1970 ◽  
Vol 7 (1) ◽  
pp. 55-63
Author(s):  
P. B. MOENS
Keyword(s):  
Fine Structure ◽  
Chromosome Pairing ◽  
Meiotic Prophase ◽  
Meiotic Chromosome ◽  
Lilium Longiflorum ◽  
Structural Level ◽  
Hereditary Material ◽  
Homologous Chromosomes ◽  
Synaptonemal Complexes ◽  
Meiotic Chromosome Pairing

In the autotetraploid Lilium longiflorum (4n = 48), there are 12 sets of 4 homologous chromosomes. Within each set of 4 homologues, switches of pairing partners and crossovers occur at meiotic prophase. At the fine-structural level, the behaviour of the chromosomes is reflected in the switches between the axial cores of the homologous chromosomes. The normal synaptonemal complexes of the autotetraploid are compared with the complexes of the allotriploid L. tigrinum, which have synaptonemal complexes with abnormal lateral elements. The possibility that the deformed lateral elements are the products of heteromorphisms between‘homologues’ is explored in the discussion. The observations on the chromosome cores are interpreted as support for the notion that the cores may be associated with the recombinationally active hereditary material during meiotic prophase.

Inferences from genetical evidence on the course of meiotic chromosome pairing in plants

1977 ◽  
Vol 277 (955) ◽  
pp. 313-326 ◽  
Keyword(s):  
Chromosome Pairing ◽  
Developmental Stages ◽  
Meiotic Chromosome ◽  
Critical Assessment ◽  
Gene Control ◽  
Meiotic Pairing ◽  
Homologous Chromosomes ◽  
Meiotic Chromosome Pairing ◽  
Combined Use ◽  
Or Gene

Meiotic chromosome pairing is a process that is amenable to genetic and experimental analysis. The combined use of these two approaches allows for the process to be dissected into several finite periods of time in which the developmental stages of pairing can be precisely located. Evidence is now available, in particular in plants, that shows that the pairing of homologous chromosomes, as observed at metaphase I, is affected by events occurring as early as the last premeiotic mitosis; and that the maintenance of this early determined state is subsequently maintained by constituents (presumably proteins) that are sensitive to either colchicine, temperature or gene control. A critical assessment of this evidence in wheat and a comparison of the process of pairing in wheat with the course of meiotic pairing in other plants and animals is presented.

Chromosome pairing in Oryza sativa L. × O. latifolia Desv. hybrids

1986 ◽  
Vol 28 (2) ◽  
pp. 278-281 ◽  
Author(s):  
E. M. Nowick
Keyword(s):  
Oryza Sativa ◽  
Chromosome Pairing ◽  
Embryo Culture ◽  
Oryza Sativa L ◽  
Meiotic Chromosome ◽  
Genetic System ◽  
Meiotic Chromosome Pairing

Meiotic chromosome pairing was examined in F1 hybrid regenerants from Oryza sativa (AA) × O. latifolia (CCDD) and O. glumaepatula (AcuAcu) × O. latifolia (CCDD) crosses produced through embryo culture. The average number of chromosome pairs in the O. sativa × O. latifolia regenerants ranged from 13.79 to 14.79. Ten to 18 bivalents were observed per cell. The average number of bivalents in the O. glumaepatula × O. latifolia regenerants ranged from 12.44 to 13.87, with 10–17 bivalents per cell. Some desynapsis occurred but 10 to 12 true bivalents remained at late metaphase in most cells. The high number of bivalents observed in the hybrids from these divergent parents indicates that a genetic system for pairing control similar to that in Triticum may be present in the Oryza genus.Key words: Oryza, embryo culture, meiosis.

scholarly journals EM analysis of meiotic chromosome pairing in a pentaploid Achillea hybrid

Heredity ◽  
1990 ◽  
Vol 65 (1) ◽  
pp. 11-20 ◽  
Author(s):  
J Loidl ◽  
F Ehrendorfer ◽  
D Schweizer
Keyword(s):  
Chromosome Pairing ◽  
Meiotic Chromosome ◽  
Meiotic Chromosome Pairing
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