Stadler Genetics Symposia, volume 06, 1974 (MU)
https://hdl.handle.net/10355/66517
2024-03-28T12:38:35ZDevelopmental genetics and crop yield
https://hdl.handle.net/10355/66558
Developmental genetics and crop yield
Carlson, P. S.; Rice, T. B.
On the basis of consideration of the patterns of seed differentiation in plants and recent results of developmental genetics in Drosophila, a program is outlined for the production of crops with improved seed characteristics. Tissue specific mutations, modifying the size or quantity of seed components (embryo, aleurone, seed coat etc.), are expected to increase yield or render better quality by altering embryo-endosperm or endosperm-aleurone etc. ratios. The induction, isolation and utilization of tissue-specific mutations for plant breeding do not require techniques not already familiar to the breeder.
1974-01-01T00:00:00ZElectronmicroscopic studies of active genes
https://hdl.handle.net/10355/66561
Electronmicroscopic studies of active genes
Hamkalo, Barbara A.; Miller, Oscar L., Jr.; Bakken, Aimee H.
Structural aspects of ribosomal and non-ribosomal RNA transcription are compared and contrasted in a representative prokaryote (Escherichia coli) and in several diverse eukaryotes (developing amphibian oocytes, Drosophila melanogaster embryos, HeLa cells, and yeast). The conformations of these active loci are described in relation to genetic and biochemical studies of the activity of the two major classes of genes.
1974-01-01T00:00:00ZFlower differentiation in arabidopsis
https://hdl.handle.net/10355/66564
Flower differentiation in arabidopsis
Rédei, G. P.; Acedo, Georgia; Gavazzi, G.
There is a consensus among developmental geneticists that few generalizations are possible at the present status of the field, and even the boundaries are difficult to define. Yet in few special cases, consistent facts have been accumulated which point to systems of controls of differentiation.In the facultative long-day plant Arabidopsis, the differentiation of flower primordia is controlled by several gene loci. Recessive mutations may determine in a qualitatively distinct manner the onset of flower development. Continuous illumination in contrast to 8-9 hours daily cycles of light promotes flowering in all genotypes. Mutants at the ld locus are incapable of flowering under short days and entail a critical day-length. Different alleles at the gi locus require several times as long period for flower induction than the wild type under 24 hours light yet under short days they do not differ, very conspicuously from the standard type. Mutants at the co locus are late flowering and recessive under long days but they are more precocious than the wild type under short days and they display dominance. In total darkness, the wild type and all mutants flower early. The aseptic feeding of 5-bromodeoxyuridine highly accelerates flower differentiation in all genotypes under long days and also under short days with the exception of the ld mutants. The analog is incorporated into the DNA of all types. Bromodeoxyuridine-grown plants accumulate higher amounts of radioactivity, provided by 14[subscript C]-amino acids, into a chromatin fraction. The experimental observations support the view that flowering in this plant is under negative control and bromodeoxyuridineis hampering the synthesis of a postulated suppressor.
1974-01-01T00:00:00ZGenetics and art
https://hdl.handle.net/10355/66560
Genetics and art
Gownas, C. Shields
In the view of the geneticist art is more than l'art pour l'art . In the absence of written genetic records, stone carvings, statues, reliefs and paintings reveal a great deal about the genes carried by our ancient predecessors. Examination of artifacts with genetic knowledge of our time, provides valuable information on hereditary defects and anthropological characters from prehistoric times. Similarly studies of family histories and portraits, sketches, caricatures can be used in the reconstruction of the genotypes of individuals of recent past. An expert examination of art history is one of the most valuable methods to trace back the process of evolution and domestication of animals and the development of ornamental and crop plants. The major results of this study are documented by 78 illustrations of the text and 92 selected references.
1974-01-01T00:00:00Z