Journal ArticleDOI
Environmentally induced changes in rRNA gene redundancy.
Jeremy N. Timmis,J. Ingle +1 more
TLDR
A large number of experiments have shown that the nucleus of the L genotroph contains 16% more DNA than that of S, with PI intermediate, and this change in nuclear DNA content appears to be essential for successful induction.Abstract:
HERITABLE changes in plant weight are induced in flax by specific growth environments. Conditioning of the original plastic genotroph (PI) produces a large stable form (L) or a small stable form (S), according to the fertilizers applied1,2. A large number of experiments have shown that the nucleus of the L genotroph contains 16% more DNA than that of S, with PI intermediate3–5. This change in nuclear DNA content, arising during the first 5 weeks of induction, appears to be essential for successful induction. The nature of the additional DNA present in the L genotroph, which presumably regulates the expression of the genotype, is therefore of great interest.read more
Citations
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Journal ArticleDOI
Evolution of DNA content in higher plants
TL;DR: A chronology of key events, events, and researchers’ observations that led to the establishment of the “six letters” structure of DNA in 1953 and its replacement by the four “letter T”s since then.
Journal ArticleDOI
The nucleolus in primary spermatocytes of Drosophila hydei.
Günther F. Meyer,Wolfgang Hennig +1 more
TL;DR: The number of active ribosomal eistrons found in some X-Y translocation stocks and in XO males deviates considerably from that expected on the basis of DNA/RNA hybridization data, and it is concluded that a mechanism adjusting the number of Ribosomal cistrons may be operating in these cases.
Book
Genetic Flux in Plants
Barbara Hohn,Elisabeth S. Dennis +1 more
TL;DR: "Infection with the crown gall bacterium Agrobacterium tumefaciens results in the transfer of bacterial DNA into the plant genome."
Journal ArticleDOI
Molecular aspects of the environmental induction of heritable changes in flax
TL;DR: A model for the induction of the DNA changes, involving a type of IS-element has been proposed, and the expression of the induced changes, in terms of altered numbers of copies of particular sequences at specific sites within the genome has been considered.
Journal ArticleDOI
Environmentally induced DNA changes in plants
TL;DR: The environment has been shown to induce heritable changes in three plant systems, namely flax, Nicotiana rustica, and soybean cell suspension cultures, and the phenomenon of environmentally induced DNA variation is compared with examples of gene amplification or deletion in other systems.
References
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Journal ArticleDOI
Interference microscopy and mass determination.
TL;DR: The development of phase-contrast and interference-cont contrast methods has focused attention on the possibility of improved accuracy in the determination of refractive indices of microscopic objects, particularly living cells, but with living cells no great variation in the refractive index of the immersion medium can be tolerated.
Journal ArticleDOI
The environmental induction of heritable change in Linum
TL;DR: The authors Received io.vii.6.6i and io.vi.5.2.1.1/1/2/3/4/5/1.
Journal ArticleDOI
Ribosomal RNA Genes and Plant Development
J. Ingle,J. Sinclair +1 more
TL;DR: The number of copies of the ribosomal RNA genes varies considerably between the different plant species studied, it does seem, however, that there is no gross amplification or deletion of these genes during the development of a particular plant.
Journal ArticleDOI
Induction and growth of flax genotrophs
TL;DR: When the range of induced types are themselves grown in different environments the largest and smallest induced types breed true but those of intermediate size repeat the process giving true breeding large and small types, and intermediate types in which further changes can be induced, as shown in fig. 1.