S. O. Graham

Effects of Nutrition and Soil Extracts on Germination of Glomus Mosseae Spores

Germination of spores of Glomus mosseae on agar media was inhibited by excess nutrient such as provided in standard Potato Dextrose or Nutrient Broth Agars, unless very low concentrations of the re...

The effects of various reagents, mounting media, and dyes on the teliospore walls of Tilletia contraversa Kühn.

Owing to their composition, the teliospore walls of the smut fungi require hydrous mounting media for microscopic observations. Tilletia contraversa Kuhn possesses a mucilaginous sheath. It is diff...

The Morphology and a Chemical Analysis of the Teliospore of the Dwarf Bunt Fungus, Tilletia Contraversa

SUMMARYEmploying various reagents to dissolve or to digest portions of the teliospore of Tilletia contraversa Kuhn in conjunction with histochemical procedures, the morphology of the spore was dete...

The Influence of Vesicular-Arbuscular Mycorrhizal Fungi on Growth and Tuberization of Potatoes

At the turn of the century Bernard suggested that mycorrhizal fung may increase tuberization in solanaceous species (1). French investi gators undertook a number of studies to demonstrate the phenomenon their works are reviewed by Rayner (11). However, definitive conclusions could not be drawn, owing to inadequate methods and unavailability of pure fungal inoculum. Furthermore, as pointed out by Harley (6), soil solutions rich in soluble nutrients usually induce asymbiotic tuberization when potatoes are grown in artificial culture facilities, i.e., nutrient formulations aimed at optimal balances in field applications variably affected tuberization in hydroponic systems.

Indophenol blue as a chromogenic agent for identification of halogenated aromatic hydrocarbons.

The metachromatic dye indophenol blue [N-(p-dimethylaminophenyl)-1,4-naphthoquinoneimine] is adaptable for qualitative and quantitative measurements of halogenated aromatic hydrocarbons in paper chromatographic procedures and spot tests.

Pantomycin: a new antimicrobial antibiotic.

Pantomycin is a new antibiotic isolated from a group of antibiotics produced in fermentation cultures of Streptomyces hygroscopicus. Pantomycin is a triad composed of carbohydrate, lipid, and polyp...

Germination Responses of Ustilago Tritici Teliospores in Relation to Lyophilization. II. Effects of the Germinative Medium on Survival

Differences in the germinative responses of the smuts are discussed by Fischer and Holton (2). They point out the variable reactions of many species to the substrates on which they have been sown. Subjecting teliospores of Ustilago tritici (Pers.) Rostr. to a saturated atmosphere for 24 hr in post-lyophile treatments often increased the percentages of germination (5). Thus, the germinability of lyophilized teliospores appears to be influenced by mechanisms involved in water uptake as well as by physical and physiologic forces imposed upon them by the substrate. In this case, mechanical and physiologic interactions are complex because of the state of the lyophilized spore. Such interactions have been discussed in connection with the eutectics