Variation in Apple Cytochimeras

Pratt, Charlotte; Ourecky, Donald K.; Einset, John

doi:10.2307/2440369

Cited by 10 publications

(3 citation statements)

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“…3, 5), the inner layers were usually replaced and left behind within the growth of 10-20 nodes. Several workers have reported the relative impermanence of the internal layers, in some instances supported by observations of more frequent periclinal divisions of internal layers (Dermen, 1951(Dermen, , 1953Clowes, 1961;Thompson and Olmo, 1963;Tilney-Bassett, 1963;Pratt, Ourecky, and Einset, 1967).…”

Section: Observations and Results-the Leaf-w 1 -mentioning

confidence: 76%

Competition and Accommodation Between Apical Layers and Their Derivatives in the Ontogeny of Chimeral Shoots of Pelargonium X Hortorum

Stewart

Semeniuk

Dermen

1974

American J of Botany

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Two mutant plastogenes in all possible chimeral combinations were followed in Pelargonium X hortorum Bailey (geranium) shoots. The part of stem, leaf, or other structure derived from each apical layer was clearly apparent on a cell to cell basis. Shoots typically were composed of derivatives of three apical layers but we found derivatives of as many as four apical layers in some leaves and of five layers in some stems. In chimeras with one of the mutants, Dpl W1, the amount of tissue derived from the various apical layers was the same, whether the layer was mutant or wild type. We suggest that there are independent apical layers and cell lineages derived from them in nonchimeral shoots, and that their contribution in normal ontogeny is like that of the layers in Dpl W1 chimeras. In chimeras carrying the second mutant, Dpl W2, there was much less tissue derived from mutant than from wild‐type apical layers. The phenotypic expression of the plastogenes was unchanged by their transmission through male or female gametes. Comparisons of the ontogeny of geranium plants carrying the W1 or W2 mutant suggested that, while there was competition between the apical layers and between their derivatives, the genome imposed a definite harmonious interaction or accommodation which led to a final normal morphology of all plant parts and organs through quite different ontogenetic pathways.

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Section: Observations and Results-the Leaf-w 1 -mentioning

confidence: 76%

Competition and Accommodation Between Apical Layers and Their Derivatives in the Ontogeny of Chimeral Shoots of Pelargonium X Hortorum

Stewart

Semeniuk

Dermen

1974

American J of Botany

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Section: _mentioning

confidence: 75%

Competition and Accommodation between Apical Layers and their Derivatives in the Ontogeny of Chimeral Shoots of Pelargonium x Hortorum

Stewart

Semeniuk

Dermen

1974

American Journal of Botany

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.A B S TRA CT Two mutant plastogenes in all possible chimeral combinations were followed in Pelargonium X hortoruim Bailey (geranium) shoots. The part of stem, leaf, or other structure derived from each apical layer was clearly apparent on a cell to cell basis. Shoots typically were composed of derivatives of three apical layers but we found derivatives of as many as four apical layers in some leaves and of five layers in some stems. In chimeras with one of the mutants, Dpl W1, the amount of tissue derived from the various apical layers was the same, whether the layer was mutant or wild type. We suggest that there are independent apical layers and cell lineages derived from them in nonchimeral shoots, and that their contribution in normal ontogeny is like that of the layers in Dpl W1 chimeras. In chimeras carrying the second mutant, Dpl W2, there was much less tissue derived from mutant than from wild-type apical layers. The phenotypic expression of the plastogenes was unchanged by their transmission through male or female gametes. Comparisons of the ontogeny of geranium plants carrying the W1 or W2 mutant suggested that, while there was competition between the apical layers and between their derivatives, the genome imposed a definite harmonious interaction or accommodation which led to a final normal morphology of all plant parts and organs through quite different ontogenetic pathways.54 January, 1974] STEWART ET AL.-CHIMERAL SHOOTS 55

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“…As it is easy to trace the cells with chromosome variations, chimeras provide useful clues for the study of plant development and morphogenesis, as in the studies on germ layers in the shoot apex and the number of shoot apical cells in flowering plants (Satina et al 1940;Prat et al 1967;Stewart and Dermen 1970). As with flowering plants, information on chromosomal chimeras may be also useful for the study of leaf morphogenesis in ferns.…”

Section: Introductionmentioning

confidence: 99%

Ploidy chimeras induced in haploid sporophytes of Osmunda claytoniana and Osmunda japonica

et al. 2007

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Haploid sporophytes of Osmunda claytoniana (2n = x = 22) were apogamously produced from calli when cultivated on a hormone-free medium. Flow cytometric analysis showed that ploidy chimeras were spontaneously produced in a haploid sporophyte of O. claytoniana and those of O. japonica that were obtained in the previous study. In the haploid sporophyte of O. claytoniana, a diploid pinnule and a partially diploid terminal segment were produced in a haploid pinna. In O. japonica, a haploid sporophyte yielded a diploid pinna in a haploid frond, and another haploid sporophyte yielded a diploid pinnule in a haploid pinna. Diploid chimeras were large in size and could be readily distinguished from other haploid parts of the fronds. It is likely that the chimeras were produced clonally from a single diploid cell that established chromosome doubling.

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Variation in Apple Cytochimeras

Cited by 10 publications

References 0 publications

Competition and Accommodation Between Apical Layers and Their Derivatives in the Ontogeny of Chimeral Shoots of Pelargonium X Hortorum

Competition and Accommodation Between Apical Layers and Their Derivatives in the Ontogeny of Chimeral Shoots of Pelargonium X Hortorum

Competition and Accommodation between Apical Layers and their Derivatives in the Ontogeny of Chimeral Shoots of Pelargonium x Hortorum

Ploidy chimeras induced in haploid sporophytes of Osmunda claytoniana and Osmunda japonica

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