Nuclear changes in flax

Evans, Gareth M.

doi:10.1038/hdy.1968.2

Cited by 98 publications

(41 citation statements)

References 9 publications

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“…Seeds of six species investigated were obtained For measurements of dry mass nuclei from root tips were isolated according to the method of McLeish (1963) with modifications described by Evans (1968). The dry mass was estimated using the Vickers M86 scanning-interferometer.…”

Section: Methodsmentioning

confidence: 99%

Chromosome weights and measures in Petunia

White

Rees

1987

Heredity

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The 2C nuclear DNA amounts in diploid Petunia species are low, ranging from 173 to 3OO picograms. The nuclear dry mass and the total chromosome volume are closely correlated with the nuclear DNA amount. So also is cell size measured in pollen grains. Increase in the total nuclear DNA within the genus is achieved by the addition of equal increments of DNA to all members of the chromosome complement irrespective of their size. It is suggested that the correlations and distribution patterns of DNA changes displayed by the natural species may serve as standards for monitoring and interpreting changes in genetic material which are associated with regeneration from protoplasts and callus.

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Section: Methodsmentioning

confidence: 99%

Chromosome weights and measures in Petunia

White

Rees

1987

Heredity

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“…Hence, it may be possible to select for low heterochromatic content in triticale. It might also be possible to artificially reduce the amount of heterochromatin present in a species by chemical (22) or other means (23,24 …”

Section: Discussionmentioning

confidence: 99%

A Possible Effect of Heterochromatin on Chromosome Pairing

Thomas

Kaltsikes

1974

Proc. Natl. Acad. Sci. U.S.A.

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Rye chromosomes were selectively stained in the meiosis of triticale (Secale L.). In triticale a varying number of homologous chromosomes fail to pair at meiosis and are seen as univalents at first mietaphase (1, 2). It has been suggested (3-7) that these univalents are mainly chromosomes of the rye genome. This conclusion was based on two general observations made on octaploid triticale. First, some triticales have a strong tendency to revert to hexaploids that resemble wheat (3). Second, individual chromosomes of rye contributed to aneuploidy much more often than wheat chromosomes (5). By contrast, in hexaploid triticales a substantial number of the aneuploids were contributed by the wheat genomes as well (8, 9). However, in order to extrapolate from aneuploidy to meiosis, we must assume that all deficiencies will be transmitted with approximately the same frequency.Ideally what is heeded is a method whereby the genomic origin of the univalents themselves can be ascertained. Such a method was suggested to us by the recent reports (10-12) that in somatic cells of triticale the wheat and rye chromosomes can be strained differentially with Giemsa. Rye chromosomes generally carry at least one large and terminal band, unlike wheat chromosomes, where terminal bands are both infrequent and small. It is generally accepted that chromosome regions that strain differentially with Giemsa are heterochromatic. MATERIALS AND METHODSGenotypes used were as follows: All pollen mother cell material was fixed in Carnoy's II. Mean

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“…L is 3-6 times the size of S and the two behave as distinct genetic types. During the first 5 weeks of induction the specific treatments also induce a divergence of nuclear DNA content (Evans, Durrant and Rees, 1966;Evans, 1968) with L ultimately having 16 per cent more than S. The original parent (P1) is intermediate in both plant weight and DNA content. Other phenotypic effects also occur (Durrant and Nicholas, 1970).…”

Section: Introduction Heritable Changes In Plant Weight Can Be Indmentioning

confidence: 99%

The nature of the variable DNA associated with environmental induction in flax

Timmis

Ingle

1974

Heredity

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SUMMARYLarge heritable differences in plant weight and in nuclear DNA amount can be induced in certain varieties of flax. The difference in DNA between the two stable types has been examined by analytical ultracentrifugation, thermal denaturation and renaturation kinetics. No differences in any localised nucleotide sequences are detectable by these methods. It is concluded, therefore, that the additional DNA found in L is representative of a wide spectrum of the flax genome in terms of composition, repetition and complexity of nucleotide sequences.

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Nuclear changes in flax

Cited by 98 publications

References 9 publications

Chromosome weights and measures in Petunia

Chromosome weights and measures in Petunia

A Possible Effect of Heterochromatin on Chromosome Pairing

The nature of the variable DNA associated with environmental induction in flax

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