Abstract
The meiotic cytological behavior of chromosomes in maize microsporocytes homozygous for the recessive mutant desynaptic was studied at various stages. It was found that following apparently normal pachytene synapsis there appears to be sporadic precocious desynapsis. By diakinesis bivalents heterozygous for a distal knob have often separated to pairs of univalents, each with a knob-carrying and a knobless chromatid. From the frequency of such events it is inferred that the crossover process is probably not affected by the mutant and that the genetic defect affects instead a distinct function concerned with chiasma maintenance following crossing over. Since precocious separation of dyads to monads at prophase II was also found in the desynaptic material, it is suggested that normal chiasma maintenance until anaphase I and normal dyad integrity maintenance between anaphase I and anaphase II may depend upon the same mechanism; it is also suggested that this may involve a special tendency for cohesiveness of sister chromatids during meiosis, beyond that which is ordinarily found at mitosis.
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Baker, B., Carpenter, A.T.C., Esposito, M.S., Esposito, R.E., Sandler, L.: The genetic control of meiosis. Ann. Rev. Genet. 10, 53–134 (1976)
Darlington, C.D.: Recent advances in cytology, pp. 1–542. Philadelphia: P. Blakiston's Son and Co. 1932
Hotta, Y., Stern, H.: Persistent discontinuities in late replicating DNA during meiosis in Lilium. Chromosoma (Berl.) 55, 171–182 (1976)
Kezer, J., Macgregor, H.C.: A fresh look at meiosis and centromeric heterochromatin in the red-backed salamander, Plethodon cinereus cinereus (Green). Chromosoma (Berl.) 33, 146–166 (1971)
Maguire, M.P.: The need for a chiasma binder. J. theoret. Biol. 48, 485–487 (1974)
Maguire, M.P.: The effect of ethanol on meiotic chromosome behavior in maize. Caryologia (Firenze) 29, 41–52 (1976)
Miller, O.L., Jr.: Cytological studies in asynaptic maize. Genetics 48, 1445–1466 (1963)
Moens, P.B.: Multiple core complexes in grasshopper spermatocytes and spermatids. J. Cell Biol. 40, 542–551 (1969a)
Moens, P.B.: Genetic and cytological effects of three desynaptic genes in the tomato. Canad. J. Genet. Cytol. 11, 857–869 (1969b)
Müller, W.: Elektronenmikropische Untersuchungen zum Formwechsel der Kinetochoren während der Spermatocytenteilungen von Pales ferruginea (Nematocera). Chromosoma (Berl.) 38, 139–172 (1972)
Neuffer, M.D., Jones, L., Zuber, M.S.: The mutants of maize, pp. 1–74. Madison Wisconsin: Crop Science Society of America 1968
Riess, R.W., Biesele, J.J.: A possible mechanism of chromosome movement in the scorpion, Centruroides vittatus (Say). Caryologia (Firenze) 25, 455–462 (1972)
Solari, A.J.: The behavior of chromosomal axes during diplotene in mouse spermatocytes. Chromosoma (Berl.) 31, 217–230 (1970)
Sotelo, J.R., Garcia, R. G., Wettstein, R.: Serial sectioning study of some meiotic stages in Scaptericus borelli (Grylloidea). Chromosoma (Berl.) 42, 307–333 (1973)
Therman, E., Kuhn, E.M.: Cytological demonstration of mitotic crossing-over in man. Cytogenet. Cell Genet. 17, 254–267 (1976)
Westergaard, M., Wettstein, D. von: The synaptinemal complex. Ann. Rev. Genet. 6, 71–110 (1972)
Whitehouse, H.L.K.: The mechanism of heredity, pp. 1–528. New York: St. Martin's Press 1973
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Maguire, M.P. Evidence for separate genetic control of crossing over and chiasma maintenance in maize. Chromosoma 65, 173–183 (1978). https://doi.org/10.1007/BF00329469
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DOI: https://doi.org/10.1007/BF00329469