A case of paracentric inversion in Papaver dubium L.

Bahl, J. R.; Tyagi, B. R.

doi:10.1508/cytologia.53.777

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…The presence of one bridge-fragment at anaphase-I was due to one cross-over inside the inversion loop. In the PMCs, where only the fragment was visible, it was presumed that this was due to the overlapping of the loop by other chromosomes at the poles and that the original configuration was loop-fragment (Bahl and Tyagi 1988). In a paracentric inversion, two breaks occur in the same arm, so the inverted region does not include a centromere.…”

Section: Discussionmentioning

confidence: 99%

Gamma Ray and Ethyl Methane Sulphonate Induced Translocation and Inversion Heterozygote in <i>Lens culinaris </i>Medik (Lentil)

Goyal

Verma

2015

CYTOLOGIA

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Summary Seeds of Lens culinaris Medik (Lentil) were irradiated with various doses of gamma rays, (viz. 5 kR, 10 kR, 15 kR, 20 kR, 25 kR and 30 kR) and some seeds were also treated with different concentrations (0.1, 0.2, 0.3, and 0.4%) of Ethyl Methane Sulphonate (EMS) for 6 and 12 h in separate experiments. Two plants, one translocation heterozygote and one inversion heterozygote, were isolated from the population raised from 10 kR gamma ray-irradiated seeds and 0.2% EMStreated seeds, respectively. The mutant plants displayed various types of chromosomal configurations at diakinesis/metaphase I, and anaphase/telophase I/II in meiosis. The translocation heterozygote exhibited the formation of ring/chain of four and six chromosomes in a majority of the PMCs at diakinesis/metaphase-I, and the inversion heterozygote was characterized by the presence of bridge and fragments at anaphase/telophase I/II because of various numbers and positions of crossovers in the inversion loop. Pollen fertility declined to 38% in the translocation heterozygote and 27.33% in the inversion heterozygote as compared to 96% in the control.

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Section: Discussionmentioning

confidence: 99%

Gamma Ray and Ethyl Methane Sulphonate Induced Translocation and Inversion Heterozygote in <i>Lens culinaris </i>Medik (Lentil)

Goyal

Verma

2015

CYTOLOGIA

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Spontaneous Occurrence of Meiotic Spindle Abnormalities in 'Long Headed Poppy' (Papaver dubium L.) from Indian Cold Regions

Singhal

Kaur

2009

CYTOLOGIA

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SummaryThe present paper reports a case of spontaneous occurrence of an abnormal spindle behaviour during male meiosis in the tetraploid (2nϭ28) cytotype of Papaver dubium from the cold regions of India. In the affected accessions, meiotic course is perfectly normal up to MI resulting into normal oriented 14 bivalents. But during AI/TI and AII/TII spindle activity is abnormal resulting into variable number of laggards, chromatin bridges, unoriented chromosomes, micronuclei, tetrads with microcytes, and polyads. Examination of 1280 PMCs during microsporogenesis reveal that 13.28% tetrads were abnormal resulting into some pollen sterility (6.76%) and variable sized apparently fertile pollen grains. Although the cytological status of these apparently fertile pollen grains could not be ascertained but there role in producing variants in the species can not be ruled out.

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A case of paracentric inversion in Papaver dubium L.

Cited by 2 publications

References 18 publications

Gamma Ray and Ethyl Methane Sulphonate Induced Translocation and Inversion Heterozygote in <i>Lens culinaris </i>Medik (Lentil)

Gamma Ray and Ethyl Methane Sulphonate Induced Translocation and Inversion Heterozygote in <i>Lens culinaris </i>Medik (Lentil)

Spontaneous Occurrence of Meiotic Spindle Abnormalities in 'Long Headed Poppy' (Papaver dubium L.) from Indian Cold Regions

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