Random assembly of different kinds of small subunit polypeptides during formation of fraction I protein macromolecules.

Maternal inheritance determine the charge on the large subunit of fraction I protein whereas both parents of an interspecific F(1) hybrid plant make an equal contribution to the charge of the small subunit. Experiments were performed to test whether fraction I protein in the hybrid plant was a hybrid molecule or two kinds of protein molecules, one composed of large subunits combined with small subunits of the male type and the other composed of large subunits combined with small subunits of the female type. A mixture of fraction I proteins from Nicotiana langsdorffii and N.

TOBACCO MOSAIC VIRUS: CYTOLOGICAL EVIDENCE OF THE SYNTHESIS IN THE NUCLEUS.

Living tomato hair cells were directly injected with tobacco mosaic virus or tobacco mosaic virus RNA with a fine glass needle. Use of a fluorescent tobacco mosaic virus antibody showed the presence of the virus protein in the nucleus 6 to 18 hours after the injection. As time of infection progressed, staining of the cytoplasm became more prominent.