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This article presents information on research papers contributed for the joint meeting with phycological section of Botanical Society of America, to be held from August 28-30, 1967. Researchers G.J. Hill and L. Machlis contributed papers on cell division in oedogonium. In this paper, the ultrastructural events occurring during vegetative and sexual cell division of oedogonium is described. Researcher Norma J. Lang contributed papers in which the extraplastidic red pigment astaxanthin was investigated.

Possible hormonal interactions between soybean roots and the Rhizobium initiating nodule proliferation in this genus were studied. A cytokinin has been isolated by column and paper chromatography from an effective strain of Rhizobium japonicum grown in pure culture. The substance promotes cell proliferation in a cytokinin-requiring soybean callus tissue. The bacteria are capable of conditioning a cytokinin-free soybean culture medium so that it is able to support the cytokinin- requiring tissue. It is concluded that the substance is a product of the bacteria rather than an artifact of purification. This unidentified cytokinin or a substance moving to a similar Rf value on the paper chromatograrn produces polyploid divisions when tested on cultured pea root segments. Some of the division figures exhibit the diplochromosomes typical of the root nodule primordium in pea. [ABSTRACT FROM AUTHOR]