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The Sn locus of maize is functionally similar to the R and B loci, in that Sn differentially controls the tissue-specific deposition of anthocyanin pigments in certain seedling and plant cells. We show that Sn shows molecular similarity to the R gene and have used R DNA probes to characterize several Sn alleles. Northern analysis demonstrates that all Sn(More)
Both light and developmental stimuli are directly involved in the regulation of plant gene expression. Pigment In maize, activation of the anthocyanin pathway represents an excellent model system for studying the interactions between an externa1 factor, such as light, and interna1 factors that regulate plant and seed development. By analyzing in detail the(More)
Dap (Defective aleurone pigmentation) is the designation for mutations in maize that give rise to a characteristic dappled endosperm phenotype, consisting of patches of purple tissue, of variable size and shape, on a yellow background. Features shared by all Dap mutants are: dominant expression when they are maternally derived, lack of expression or(More)
The process that leads to embryo formation appears to follow a defined pattern, whose sequential developmental steps—under strict genetic control—can be analysed through the study of mutants affecting embryogenesis. We present the analysis of four embryo-specific (emb) mutants of maize, characterised by abnormal development not overcoming the proembryo or(More)
BACKGROUND In angiosperms the seed is the outcome of double fertilization, a process leading to the formation of the embryo and the endosperm. The development of the two seed compartments goes through three main phases: polarization, differentiation of the main tissues and organs and maturation. SCOPE This review focuses on the maize kernel as a model(More)
Fluorescence analysis after quinacrine staining in squashes of Varese wild stock male larval ganglia confirmed that the Y chromosome has four characteristic sections of bright fluorescence. In one Y/X and in one Y/III translocation the section of bright fluorescence on the short arm of the Y is no longer bright when translocated onto the terminal portion of(More)
The distribution patterns of different stains (orcein, quinacrine and Giemsa) in an established cell line of Drosophila melanogaster (GM3 WS) were compared. Each chromosome stained both with quinacrine and with Giemsa shows up a specific banding pattern for heterochromatin. The comparison between the two patterns suggests a hypothesis concerning the(More)
The karyotypic variation of a cell line (K C ) established from primary cultures of embryonic cells of Drosophila melanogaster was studied. Aneuploidy and structural rearrangements were found consisting mainly in: 1) loss of one of the chromosomes of the IV pair, 2) presence of a heterochromatic centric fragment (Y ?), 3) enlargement of the heterochromatic(More)