The effect of temperature on chiasma frequency

Elliott, C. G.

doi:10.1038/hdy.1955.39

Cited by 61 publications

(39 citation statements)

References 21 publications

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“…The differences between the mean At °, the analysis of variance indicates a positive correlation between the chiasma frequencies of the bivalents, and this bears out the observation of a positive correlation in their pairing behaviour. For each of the chromosome types, L, M and S, more nuclei have all univalents or all bivalents than is expected by chance (Elliott, 1955).…”

Section: Results With Hyacinthusmentioning

confidence: 99%

“…The hyacinth material and the temperature treatments given have been described previously (Elliott, 1955).…”

Section: Methodsmentioning

confidence: 99%

“…Group I bulbs were undergoing meiosis when collected on 21st December 1952. Group II bulbs were collected on i8th October 1952 and placed in pots of soil in controlled temperature chambers (see Elliott, 1955). …”

Section: Methodsmentioning

confidence: 99%

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Environmental effects on the distribution of chiasmata among nuclei and bivalents and correlation between bivalents

Elliott

1958

Heredity

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Section: Results With Hyacinthusmentioning

confidence: 99%

“…The hyacinth material and the temperature treatments given have been described previously (Elliott, 1955).…”

Section: Methodsmentioning

confidence: 99%

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Environmental effects on the distribution of chiasmata among nuclei and bivalents and correlation between bivalents

Elliott

1958

Heredity

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“…However, the reports have been contradictory. Some claimed a positive correlation between the temperature and the chiasma frequency (Sax 1937;Barber 1942; 1957;Wilson 1959;Kato and Yamagata 1977) and still others a negative correlation (Matsuura and Haga 1942;Elliott 1955). Handerson (1963), while working on Schisticerca gregaria, observed an initial fall in the chiasma frequency with increased temperature (40°C), followed by a gradual recovery described as an "adaptation effect".…”

Section: Discussionmentioning

confidence: 99%

Variable multivalent orientations during diakinesis and metaphase I in microsporocytes ofTradescantia spathaceaSw.

Koul¹,

Nagpal²,

Kumar

2013

Caryologia

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Meiotic studies carried out on seven plants/clones of Tradescantia spathacea did not show the expected ring of 12 chromosomes in any of the 1765 cells studied at diakinesis (1202 cells) and metaphase I (563 cells). While at diakinesis the chromosomes resolved into chain configurations of all lengths ranging from one through 12 chromosomes, with the mean per cell being 2.47 ± 1.28, at metaphase I chains carrying up to 10 chromosomes were seen and the mean per cell was 4.18 ± 1.47. However, the larger chains were not the most frequent configurations observed at the two stages. Bivalents and univalents were the most frequent configurations observed in 38.68 and 43.92% cells at diakinesis and 63.94 and 57.72% cells at metaphase I, followed by chains of 10 (29.95% cells) and chains of three (51.50% cells) at the two stages, respectively. The larger chains, though visible at both the meiotic stages, varied significantly in the centromere orientation patterns. While at diakinesis they predominantly showed linear or indifferent orientation, at metaphase I 83.25% chains showed alternate orientation, with the rest showing linear and/or indifferent orientation. A high frequency of alternate orientation was observed in chains of three chromosomes (93.93%), followed by the chains of five and four, where 74.19 and 71.27% chains appeared in alternate orientation, respectively. In 4.97% cells with two chains of six chromosomes each, contrasting behavior was noticed in the two chains in respect of orientation. While one chain appeared zigzagged with alternate centromeres facing the same pole, the other chain invariably appeared in linear configuration. As a result of complex configurations at metaphase I and the high frequency of univalents, anaphase I segregation of chromosomes was highly irregular with 84% cells showing 1-3 lagging chromosomes. The average pollen viability determined for the seven clones studied was very low (17.87 ± 2.57%). The probable cause(s) of the different behaviors of the chain multiples at the two meiotic stages is discussed.

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“…Interruption of pairing by heat shock A reduced bivalent and chiasma frequency at high temperatures has been frequently reported (e. g. Barber 1941, 1942, Davidson 1958, Emsweller and Brierley 1943, Ernst 1938, Elliott 1955, Haga 1937, Heilborn 1930, Malik 1960, Oehlkers 1937, and Sax 1936. From the results obtained with T. grandiflorum, the following points emerge: 1) Where few bivalents are formed, the long chromosomes are more successful than the short ones.…”

Section: Discussionmentioning

confidence: 99%

Heterochromatin in American and Japanese Species of <i>Trillium</i>, III

Dyer

1964

CYTOLOGIA

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The effect of temperature on chiasma frequency

Cited by 61 publications

References 21 publications

Environmental effects on the distribution of chiasmata among nuclei and bivalents and correlation between bivalents

Environmental effects on the distribution of chiasmata among nuclei and bivalents and correlation between bivalents

Variable multivalent orientations during diakinesis and metaphase I in microsporocytes ofTradescantia spathaceaSw.

Heterochromatin in American and Japanese Species of <i>Trillium</i>, III

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