The Meiotic Divisions of Haploid, Diploid and Tetraploid Tomatoes with Special Reference to the Prophase

Humphrey, L. M.

doi:10.1508/cytologia.5.278

Cited by 36 publications

(10 citation statements)

References 19 publications

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“…As Humphrey (1934) demonstrated, although letrasynapsis was frequently observed in the tetraploid tomato, crossing-over appeared to be restricted to bivalents.…”

Section: Resultsmentioning

confidence: 89%

“…but observed by others (Belling, I93l:Skovstcd. 1933;Humphrey, 1934;Olmo, 1934;Hungerford, 1970;Luciani et al. 1976Luciani et al.…”

Section: Resultsmentioning

confidence: 99%

“…Tomatoes, for example, have been reported to show both complete synapsis in tetraploids (Humphrey, 1934) and only synapsis by twos at any one region in triploids (Lesley. 1926).…”

Section: Resultsmentioning

confidence: 99%

“…same period, observations of limited (i.e., not involving the entire chromosome) triple synapsis were made in several triploids (Belling, 1931;Skovsted, 1933;01mo, 1934) and one case of extensive quadruple synapsis in a tetraploid tomato (Humphrey, 1934). Later studies of trisomics in maize (Einset, 1943) and tomatoes (Rick and Barton, 1954) supported the view that pairing was restricted to two chromosomes at any point or region.…”

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confidence: 94%

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Chromosome painting analysis of early oogenesis in human trisomy 18

Cheng

Chen²,

Gartler

1995

Cytogenet Genome Res

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We have used chromosome 18-specific painting probes to analyze early stages of oogenesis in two human trisomy 18 fetuses. At leptotene, a diffuse, nonlinear chromosomal fluorescence was detected as one (27%), two (42%), or three (31 %) signals in 534 cells. The variation in size of these signals implies the possibility of associations between homologs prior to zygotene. At pachytene, about 75 % (339/453) of the cells had a trivalent configuration, and almost half of these cells exhibited almost complete triple synapses. Approximately 24% of the pachytene cells demonstrated a bivalent:univalent configuration, and 1 % exhibited complete asynapsis. Our data imply that triple synapses may be a regular feature of meiosis involving multivalents.

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“…As Humphrey (1934) demonstrated, although letrasynapsis was frequently observed in the tetraploid tomato, crossing-over appeared to be restricted to bivalents.…”

Section: Resultsmentioning

confidence: 89%

“…but observed by others (Belling, I93l:Skovstcd. 1933;Humphrey, 1934;Olmo, 1934;Hungerford, 1970;Luciani et al. 1976Luciani et al.…”

Section: Resultsmentioning

confidence: 99%

“…Tomatoes, for example, have been reported to show both complete synapsis in tetraploids (Humphrey, 1934) and only synapsis by twos at any one region in triploids (Lesley. 1926).…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 94%

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Chromosome painting analysis of early oogenesis in human trisomy 18

Cheng

Chen²,

Gartler

1995

Cytogenet Genome Res

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“…In maize haploids, RANDOLPH, 1932 has reported the foimation of ten univalents whereas TING (1962TING ( , 1966 PMC in 11% of cells and 1 bivalent per PMC in 6% of cells respectively. Similarly in haploid tomato, LINDSTROM &KOOS, 1931 andHUMPHREY, 1934 reported only the presence of 12 univalents but I~COCI~ARD et al (1969) in the haploid tomato studied by them reported the occurrence of up to 2 bivalents per PMC. Underlying this problem thus, there seems to be an amount of complexity.…”

Section: Discussionmentioning

confidence: 96%

The meiotic behaviour of a haploid pearl millet

Manga

Pantulu

1971

Genetica

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Meiosis was studied m one haploid plant of pearl millet, obtained from twin seedhngs. Apparent pairing resulted m up to three blvalent associations at pachytene. At diakmesis and metaphase I associations of two, three or four chromosomes were observed The frequency distribution of blvalents at metaphase followed a truncated Poisson distribution, suggesting that the bivalents were random pairs. They were considered to be pseudo-blvalents. Univalents varied in number from three to seven and they formed s-s and e-s associations. The s s and e-s associations were random associations since their frequency distributions also followed a truncated Poisson distribution. A bipolar spindle was observed in a large number of PNIC's but in a few cases two unipolar spindles were observed The anaphase I distribution of the chromosomes deviated from albinomial distribution. Laggards were observed at telophase I. The dyads varied in size and in number of chromosomes. After the second division cell wall formation often failed to take place m one or in both the dyads, resulting in the formation of 2 to 4 microspores and mlcrospores with two nuclei. The pollen grains varied in size and number of chromosomes The plant was completely sterile.

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