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

Timmis, Jeremy N.; Ingle, John

doi:10.1038/hdy.1974.100

Cited by 17 publications

(4 citation statements)

References 21 publications

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“…As this difference only accounts for 0.23 % of the difference in DNA content between (L) and (S) genotrophs, other sequences must also be involved. This conclusion is supported by additional biochemical studies (Cullis 1973;Timmis & Ingle 1974). A ttem pts to induce intraspecific varia tion in nuclear DNA content in a few other species similar to those obtained in flax have been unsuccessful.…”

Section: Intraspecific Variation In D N a Amount Per Genomementioning

confidence: 78%

Nuclear DNA amounts in angiosperms

Bennett

Smith²

1976

Phil. Trans. R. Soc. Lond. B

1,394

454

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The number of angiosperm species for which nuclear DNA amount estimates have been made has nearly trebled since the last collected lists of such values were published, and therefore, publication of a more comprehensive list is over due. This paper lists absolute nuclear DNA amounts for 753 angiosperm species. The dats were assembled primarily for reference purposes, and so the species are listed in alphabetical order, as this was felt to be more helpful to cyto- and biochemists whom, it is anticipated, will be among its major users. The paper also reviews aspects of the history, nomenclature, methods, accuracy and problems of nuclear DNA estimation in angiosperms. No attempt is made to reconsider those aspects of nuclear DNA estimation which have been fully revised previously, although the bibliography of such aspects is given. Instead, the paper is intended as a source of basic information regarding the terminology, practice and limitations of nuclear DNA estimation, especially by Feulgen microdensitometry, as currently practiced.

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Section: Intraspecific Variation In D N a Amount Per Genomementioning

confidence: 78%

Nuclear DNA amounts in angiosperms

Bennett

Smith²

1976

Phil. Trans. R. Soc. Lond. B

1,394

454

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“…My first introduction to epigenetics was in the flax genotroph projects of my PhD supervisor (104), but this topic otherwise passed me by until we became interested in transgene silencing. In parallel with various viral projects, including ours (29,36,71,72), there were intriguing findings about the coordinate suppression (or cosuppression) of a transgene and the corresponding endogenous gene in Petunia and tomato (30,83,105).…”

Section: On Epigeneticsmentioning

confidence: 99%

“…The University was, and still is, a leading center of molecular biology, and I had the good fortune to be accepted into John Ingle's laboratory. He was well known for seminal work with Joe Key on auxin (56), and he had a range of interesting projects, including one on flax epigenetic genotrophs (104)-lines that acquired heritable changes to their growth in response to either high or low fertilizer in the first generation.…”

Section: An Introduction To Botanical Beachcombingmentioning

confidence: 99%

An RNA World

Baulcombe

2023

Annu. Rev. Plant Biol.

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My research career started with an ambition to work out how genes are regulated in plants. I tried out various experimental systems—artichoke tissue culture in Edinburgh; soybean root nodules in Montreal; soybean hypocotyls in Athens, Georgia; and cereal aleurones in Cambridge—but eventually I discovered plant viruses. Viral satellite RNAs were my first interest, but I then explored transgenic and natural disease resistance and was led by curiosity into topics beyond virology, including RNA silencing, epigenetics, and more recently, genome evolution. On the way, I have learned about approaches to research, finding tractable systems, and taking academic research into the real world. I have always tried to consider the broader significance of our work, and my current projects address the definition of epigenetics, the arms race concept of disease resistance, and Darwin's abominable mystery. Expected final online publication date for the Annual Review of Plant Biology, Volume 74 is May 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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“…L has 16 per cent more nuclear DNA, due to alterations in a range of repeated gene sequences (Cullis, 1973 ;Timmis & Ingle, 1974) and about 60 per cent more ribosomal genes (Timmis & * Present address: Department of Botany, Rajshahi University, Rajshahi, Bangladesh lngle, 1973Cullis, 1976). They differ in isozymes (Cullis & Kolodynska, 1975), and in a capsule character, hairless septa, h (Fig.…”

Section: Introductionmentioning

confidence: 99%

Regulation of hairless septa in flax genotrophs

Durrant

Joarder

1978

Genetica

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Reciprocal crosses were made between large and small genotrophs differing in the capsule character H -h (hairy -hairless septa) of the variety Stormont Cirrus, thus bringing together two levels of regulation, one determining H and the other h in the Hh heterozygotes. HH, Hh and hh types appear in all generations from F2 to Fs but the Hh plants can be grouped in up to four classes with about 20, 30,40 and 50 hairs per septum. A proportion of Fz and Fs Hh plants are switched to HH in some environments and to hh in others, but in later generations more stable Hf+ heterozygotes appear which are unaffected by the environment and give normal ratios undisturbed by the Hh class from which they are descended, either because they have been selected for, or because they have been built up, over generations. HH plants in Fz are enhanced, i.e., they have a higher mean hair number than HH parents, and give more Hh plants in the highest hair number class when backcrossed to hh than do HH parents crossed with hh.

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

Cited by 17 publications

References 21 publications

Nuclear DNA amounts in angiosperms

Nuclear DNA amounts in angiosperms

An RNA World

Regulation of hairless septa in flax genotrophs

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