Genetic control of chromosomal chimerism found in a regenerate from tobacco callus.

Ogura, Hisakazu

doi:10.1266/jjg.53.77

Cited by 23 publications

(5 citation statements)

References 51 publications

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“…So, a unique mutation could explain both abnormalities. A similar situation has been reported by Ogura (1978). We consider that in the progeny of the regenerated plants and they have suggested other possibilities to explain it: sectoring, transposition, methylation (Lee and Phillips 1988), and paramutation (Oono 1986).…”

Section: Discussionsupporting

confidence: 83%

Cytogenetic variation in rye regenerated plants and their progeny

Linacero¹,

Vázquez²

1992

Genome

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LINACERO, R., and VAZQUEZ, A. M. 1992. Cytogenetic variation in rye regenerated plants and their progeny. Genome, 35: 428-430. Regenerated plants obtained from immature embryo-derived.talluses of four cultivars of rye, as well as their progeny, were cytologically analyzed. Chromosome number modified plants were found among the regenerants. The progeny of apparently normal diploid regenerated plants was tested and in some cases chromosomally abnormal plants appeared. Equally, meiotic abnormalities were observed in some of the regenerated plants and their progenies. The cytological variations observed were inheritable and in some cases both types of abnormalities could be related. The nature of the variations is discussed. Key words: Secale cereale, somaclonal variation, nondiploid plants, meiotic abnormalities. LINACERO, R., et VAZQUEZ, A. M. 1992. Cytogenetic variation in rye regenerated plants and their progeny. Genome, 35 : 428-430. Des plantes rCgCnCrCes, obtenues d'embryons immatures issus de cals de quatre cultivars de seigle, ont Ct C analysCes cytologiquement, ainsi que leurs descendants. Des plantes modifiCes quant au nombre de chromosomes ont Ct C trouvCes parmi les rCgCnCrants. Les descendants de plantes rCgCnCrCes, d'apparence diploi'de normale, ont Ct C testes et certaines d'entre eux se sont avCrCs anormaux sur le plan chromosomique. Des anormalitks mCiotjques ont aussi Ct C observCes chez certaines des plantes rCgCnCrCes, ainsi que chez leurs descendants. Ces variations cytologiques ont Ct C hCrCditaires et, dans certains cas, les deux types d'anormalitks ont pu Etre relies. La nature des variations est discutCe.

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Section: Discussionsupporting

confidence: 83%

Cytogenetic variation in rye regenerated plants and their progeny

Linacero¹,

Vázquez²

1992

Genome

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“…Variability in chromosome number and morphology is more common in somatic cells cultured in vitro (Bayliss, 1980;Larkin & Scowcroft, 1981). It has been established in such important crop plants as wheat, tobacco and trees like larches, that this chromosome chimerism and elimination in chromosome number may be genetically controlled in certain biotypes (Illies, 1966;Guerra & Fernandes, 1977;Ogura, 1978), although not in all cases reported the observations are entirely reliable. It has been established in such important crop plants as wheat, tobacco and trees like larches, that this chromosome chimerism and elimination in chromosome number may be genetically controlled in certain biotypes (Illies, 1966;Guerra & Fernandes, 1977;Ogura, 1978), although not in all cases reported the observations are entirely reliable.…”

Section: Introductionmentioning

confidence: 78%

“…Chromosomal instability without clear correlation with plant morphology has been recorded in other plant species also: Larix (Illies, 1966), Medicago (Sadasivaiah & Lesins, 1974), Wheat (Watanabe, 1962;Guerra & Fernandes, 1977), Bromus inermis (Tan & Dunn, 1977), tobacco (Ogura, 1978), Lathyrus sativus (Lavania, 1982), Coix gigantia (Nirmala & Rao, 1984), and many others cited therein. Chromosomal instability without clear correlation with plant morphology has been recorded in other plant species also: Larix (Illies, 1966), Medicago (Sadasivaiah & Lesins, 1974), Wheat (Watanabe, 1962;Guerra & Fernandes, 1977), Bromus inermis (Tan & Dunn, 1977), tobacco (Ogura, 1978), Lathyrus sativus (Lavania, 1982), Coix gigantia (Nirmala & Rao, 1984), and many others cited therein.…”

Section: Occurrence Of Chromosomal Instability and Its Possible Consementioning

confidence: 95%

Chromosomal instability in lemon grass, Cymbopogon flexuosus (Steudel) Wats

Lavania

1987

Genetica

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Somatic mitoses in C. flexuosus exhibit a significant degree of chromosomal instability leading to nearly 33°70 cells with chromosome elimination. A range of chromosome numbers between 20-8 (most common being 2n = 20, the somatic number for this species) was encountered from root tip cells. The course of variation suggests a gradual elimination of somatic chromosomes. The larger chromosomes are less stable and are eliminated earlier. The variation in chromosome number in somatic cells within individual plants is possibly controlled by genetic factors, which result from weaker spindle operation and minute chromosomes.

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“…Meiotic lability in terms of numerical variations in PMC chromosomes was earlier inferred to have originated from premeiotic spindle error, premeiotic chromosome elimination (Ogura 1978;Lavania 1982), and intercellular chromatin and (or) chromosome migration through cytomixis (Sarvella 1958 1987), such evidence is yet to be achieved for the ingrained genetic determinants in cytomixis. However, the earlier convincing proposals for genetic factors in cytomixis (Sarvella 1958;Brown and Bertke 1969;De and Sharma 1983) have been substantiated further by cytological evidence in Panax pseudo-ginseng indicating that there is specific chromosomal function behind cytomixis (Patra 1986).…”

Section: Resultsmentioning

confidence: 99%

Genetic components of chromosome behaviour in Papaver somniferum L.

Patra¹,

Chauhan²

1988

Genome

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PATRA, N. K., and CHAUHAN, S. P. 1988. Genetic components of chromosome behaviour in Papaver somniferum L. Genome, 30: 677 -679. Three nuclear variables, namely chiasma frequency, internuclear variation of chiasmata, and numerical deviations in the chromosomes of pollen mother cells, referred to as meiotic lability, were studied in 5 x 5 diallel crosses of Papaver somniferum L. Chiasma frequency and meiotic lability were controlled by both additive and dominant gene actions and internuclear chiasmata variance was controlled by the dominant component. High values for chiasma frequency and meiotic lability were dominant over their low values, whereas low values of internuclear variation of chiasmta were dominant over the corresponding high values.

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Genetic control of chromosomal chimerism found in a regenerate from tobacco callus.

Cited by 23 publications

References 51 publications

Cytogenetic variation in rye regenerated plants and their progeny

Cytogenetic variation in rye regenerated plants and their progeny

Chromosomal instability in lemon grass, Cymbopogon flexuosus (Steudel) Wats

Genetic components of chromosome behaviour in Papaver somniferum L.

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