Cytological Studies of certain Meiotic Stages in Oenothera1

Sheffield, F. M. L.

doi:10.1093/oxfordjournals.aob.a090102

Cited by 32 publications

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“…The methods used were principally those which had previously been found to give good results (Gates and Sheffield, 1929 ;Sheffield, 1927) and hence call for no special description here. Most observations were made on material fixed in Allen's modification of Bouin's fluid.…”

Section: Materials a N D Meth O D Smentioning

confidence: 99%

“…The following table shows the characteristic configuration of the chromosomes of each hybrid, the arrangement previously observed in the parent species (Sheffield, 1927) being also given for comparison. Oe.…”

Section: E Sc R Ip T Io Nmentioning

confidence: 99%

“…biennis, where the chromosomes form two rings of six and eight (Cleland, 1926) and Oe. Agari, where the construction of the rings varies, but in which no pairing occurs (Sheffield, 1927).…”

Section: Chromosome Linkage As An Inherited Charactermentioning

confidence: 99%

“…Some such hybrids have already been described by Cleland (1927). This paper will deal with the chromosome behaviour in a number of Fx hybrids between pure lines in which the meiotic divisions have already been studied (Sheffield, 1927).…”

mentioning

confidence: 99%

“…In an attempt to find out whether there is any evidence of the inheritance of a particular chromosome arrangement as a genetic character, all the chromo some linkages which have been described in hybrids were tabulated and, where possible, were compared with the linkages prevalent in the parental forms (Cleland, 1927 ;Gates and Sheffield, 1929 ;Oelilkers, 1926 ;Sheffield, 1927). Where twin hybrids showed different linkages they were regarded as two separate forms.…”

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confidence: 99%

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Chromosome linkage in oenothera, with special reference to some F ₁ hybrids

1929

Proc. R. Soc. Lond. B.

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Oenothera has placed a large part in our initiation into many new fields of cytological and genetical research. Since ring-formation of chromosomes was first observed in this genus by Cleland a few years ago, it has become apparent as a characteristic of meiosis in several other Angiosperms, but whether these are entirely comparable to Oenothera is at present doubtful. It is to Oenothera that we look for the final solution of many of the difficulties encountered in any endeavour to correlate these phenomena with chromosome behaviour in more typical genera, for within the Onagra group are numerous inter-fertile species, each of which is characterised by its own particular chromosome configuration, which is constant throughout all the pollen mother-cells. Such rings are now known to occur also at reduction division in the embryo-sac mother-cell of a number of forms, and it has been found that similar configurations prevail on the male and female side in any particular species. This is observed by the author to be the ease in Oe. rubricalyx (unpublished) and similar conditions have been described by Håbansson (1928) in several other derivatives of Oe. Lamarckiana . It seemed that a systematic study of the linkage of the chromosomes in a number of pure lines and in the hybrids between them was desirable, in that it might throw some light on the exact nature of pairing and chromosome linkage. Some such hybrids have already been described by Cleland (1927). This paper will deal with the chromosome behaviour in a number of F 1 hybrids between pure lines in which the meiotic divisions have already been studied (Sheffield, 1927).

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Section: Materials a N D Meth O D Smentioning

confidence: 99%

Section: E Sc R Ip T Io Nmentioning

confidence: 99%

“…biennis, where the chromosomes form two rings of six and eight (Cleland, 1926) and Oe. Agari, where the construction of the rings varies, but in which no pairing occurs (Sheffield, 1927).…”

Section: Chromosome Linkage As An Inherited Charactermentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Chromosome linkage in oenothera, with special reference to some F ₁ hybrids

1929

Proc. R. Soc. Lond. B.

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MEIOSIS IN THE SPOROCYTES OF TWO MUTATIONS OF OENOTHERA PRATINCOLA AND THEIR HYBRIDS

Kulkarni¹

1929

American J of Botany

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THE GENETICS AND CYTOLOGY OF TWO FIFTEEN‐CHROMOSOME MUTANTS FROM THE HAPLOID OF OENOTHERA FRANCISCANA

Anderson

1933

American J of Botany

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non-di sjunction in th e homeotypic division (probably in the embryo sac) would give the 8-chromosome gamete necessary for the production of a I Schr omosome zygote. There may be seven possible types of Is-chromosome zygotes, since any of the 7 chromosomes of the franciscana set might be involved in non-disjunction. Such a group of seven trisomic forms would corres pond to the twelve primaries established for D atura by Blakeslee and his co-workers.

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Cytological Studies of certain Meiotic Stages in Oenothera1

Cited by 32 publications

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Chromosome linkage in oenothera, with special reference to some F ₁ hybrids

Chromosome linkage in oenothera, with special reference to some F ₁ hybrids

MEIOSIS IN THE SPOROCYTES OF TWO MUTATIONS OF OENOTHERA PRATINCOLA AND THEIR HYBRIDS

THE GENETICS AND CYTOLOGY OF TWO FIFTEEN‐CHROMOSOME MUTANTS FROM THE HAPLOID OF OENOTHERA FRANCISCANA

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Cytological Studies of certain Meiotic Stages in Oenothera1

Cited by 32 publications

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Chromosome linkage in oenothera, with special reference to some F 1 hybrids

Chromosome linkage in oenothera, with special reference to some F 1 hybrids

MEIOSIS IN THE SPOROCYTES OF TWO MUTATIONS OF OENOTHERA PRATINCOLA AND THEIR HYBRIDS

THE GENETICS AND CYTOLOGY OF TWO FIFTEEN‐CHROMOSOME MUTANTS FROM THE HAPLOID OF OENOTHERA FRANCISCANA

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Chromosome linkage in oenothera, with special reference to some F ₁ hybrids

Chromosome linkage in oenothera, with special reference to some F ₁ hybrids