Volume 51, Issue 3
March 1960, pages 103-156
pp 103-115 March 1960
pp 116-121 March 1960
pp 122-132 March 1960
An enumeration is given of the common grasses of Lucknow and its environs with notes on locality of occurrence, habitat and the date of collection in the flowering state. Attention is directed to recent nomenclatural changes. A generic key based on the current classification is presented for the ready identification of the common Lucknow genera.
pp 133-142 March 1960
The ability of strains of representative species of sporeforming bacilli to sporulate endotrophically in distilled water has been demonstrated. The degree of sporulation which a bacterium may undergo is a strain specific character but some species are more capable than others. The effect of various exogenous compounds on the phenomenon has been studied. It has been observed that various metallic salts, organic acids and autoclaved carbohydrates inhibit sporulation at concentrations that are growth inhibitory in nutrient media. It has been postulated that all or most growth inhibitory substances may at similar or lower concentrations inhibit endotrophic sporulation. A hitherto accepted procedure of sterilisation, the autoclaving of concentrated aqueous solutions of sugars, has been found to enhance the ability of the sugar to inhibit sporulation. None of the growth factors tested had any effect on sporulation.
pp 143-149 March 1960
A resistant strain of yeast when plated on drugged agar medium gives rise to primary and secondary colonies. A comparative study of the two types of cells from these colonies has been reported in regard to carbon dioxide evolution, oxygen uptake, alcohol forming capacity and cells mass synthesized. The secondary colony seems to arise from a mutant strain.
pp 150-156 March 1960
The paper deals with the root-rot ofKochia indica Wight caused byRhizoctonia solani Kuhn which secures successful infection through the root of the host. The disease is described for the first time.
The external and internal symptomatology of the diseased plants has been described. The distribution of the fungus in different parts of the host has been studied in detail. In the seedling stage of the plant the disease symptoms resemble the ‘damping-off’.
The morphology of the pathogen in culture and its temperature requirements have been determined.