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Evidence on the time of chromosome pairing from the preleptotene spiral stage in Lilium longiflorum Croft


, : Evidence on the time of chromosome pairing from the preleptotene spiral stage in Lilium longiflorum Croft. Chromosoma 9 (4) 375-418

A period of chromosome spiralization and contraction was observed between premeiotic interphase and leptotene in Lilium longiflorum “Croft”. There was variation in the extent of preleptotene spiralization and contraction of chromosomes among microsporocytes, anthers and buds. The chromosomes sometimes contracted sufficiently to be visible as separate entities. It could then be determined that the chromosomes were single and entirely separate; synapsis and crossing-over had not yet occurred. Furthermore there was no evidence of alignment or association of homologues during the preleptotene contraction period; the chromosomes appeared to be distributed at random. The chromosomes subsequently elongated into the leptotene stage. Wherever they were visible separately the chromosomes were single in early leptotene. These observations support the classical view that synapsis of homologous chromosomes takes place during zygotene, followed by crossing-over at pachytene.

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Accession: 015759773

DOI: 10.1007/bf00281923

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Related references

Walters, M.S., 1970: Evidence on the time of chromosome pairing from the pre leptotene spiral stage in lilium longiflorum m. Chromosoma (Berlin) 29(4): 375-418

Walters M.S., 1969: Evidence on chromosome pairing from a pre leptotene spiral stage in lilium longiflorum m. XI International Botanical Congress : 232

Walters M.S., 1968: Evidence concerning the time of chromosome pairing in meiosis of lilium longiflorum m abstract. Genetics 60(1 PART 2): 235

Walters, M.S., 1976: Variation in preleptotene chromosome contraction among 3 cultivars of lilium longiflorum. Preleptotene chromosome contraction was observed in several clones of L. longiflorum cv. 'Ace', 'Nellie White' and 'Croft'. The degree of chromosome contraction was variable, among microsporocytes of single anthers, b...

Walters, Ms, 1976: Variation in preleptotene chromosome contraction among three cultivars of Lilium longiflorum. Chromosoma 7 (1) 51-80

Holm, P.B., 1977: 3 dimensional reconstruction of chromosome pairing during the zygotene stage of meiosis in lilium longiflorum. Chromosome pairing in early zygotene in L. longiflorum was studied by 3-dimensional reconstructions at the EM level. One nucleus was completely reconstructed, and the pairing behavior and length of the 12 partially synapsed bivalents was analyzed...

Walters, M.S., 1972: Pre leptotene chromosome contraction in lilium longiflorum croft. Chromosoma (Berlin) 39(3): 311-332

Bennett, M.D.; Stern, H., 1975: The time and duration of preleptotene chromosome condensation stage in Lilium hybrid cv. Black Beauty. Proceedings of the Royal Society of London. Series B, Biological Sciences 188(1093): 477-493

Bennett, M.D.; Stein, H., 1975: The time and duration of preleptotene chromosome condensation stage in Lilium hybrid cv. Black Beauty. A period of chromosome condensation followed by decondensation occurred between premeiotic interphase and leptotene in the cv. Black Beauty. The duration of this period was estimated to be about 1.16 days in pollen mother cells (p.m.cs) of plants...

Walters, Ms, 1978: Meiosis readiness in Lilium longiflorum Croft. It is proposed that anthers of Lilium longiflorum “Croft” approaching the end of premeiotic mitosis reach a state described as “meiosis readiness” after which cells in premeiotic prophase are unable to complete a mitotic division but despi...