Volume 43, Issue 6
June 1956, pages 271-339
pp 271-275 June 1956
Spectrochemical analysis, using the standard Lundegårdh flame emission (spark-in-flame) method, of cotton plants infected byFusarium vasinfectum Atk., showed an increased uptake of Mg, Ca, Fe and Mn with decreased accumulation of K over the healthy plants. It is suggested that the derangement in the selective absorption of ions, seen in the infected plants, is more likely to have been caused by chemical agents (toxins) than physical causes such as plugging of vessels.
pp 276-278 June 1956
pp 279-287 June 1956
pp 288-301 June 1956
Data have been collected on the temperature, pH, silt colloidal matter, moisture and phosphate content of mud samples from two selected stations of the West Hill Sea along the Malabar Coast.
The variations in the several factors have revealed a distinct seasonal trend, the values being, in general, low for all the factors during the monsoon months.
The bottom muds contain large quantities of interstitial and adsorbed phosphates in the non-monsoon period. During the monsoon there is a rapid release of phosphates into the overlying column of water.
The factors associated with the monsoon release of phosphates from the muds are examined.
pp 302-307 June 1956
Pre-treatment to an optimum concentration of 5–10 p.p.m. of 8-quinolinol was found to give effective protection to cut shoots of cotton against toxæmia to dialysed culture filtrate ofFusarium vasinfectum. The chemotherapeutant was also effectivein vivo in sand cultures. The possible role of 8-quinolinol in the cotton wilt control with special reference to heavy metal chelation is discussed.
pp 308-313 June 1956
Five isolates ofP. palmivora isolated from diseased areca fruits were under study. These exhibited differences in various characters. Sexual reproductive bodies were formed by some of the strains on the fruits in nature. These strains developed oospores in single sporangial cultures on agar media also. Carrot agar was found to be better suited for the formation of numerous oospores.
pp 314-324 June 1956
1. The vacuole was studied under ordinary, phase contrast and dark ground illumination in yeast of varying ages. With the increasing age of the culture almost all cells appear vacuolated and more and more cells exhibit luminous contours to their vacuoles.
2. On transfer to fresh media the vacuoles and grains disappear from view and the cytoplasm looks homogeneous. During such a phase in its growth-cycle, yeast appears comparable to meristematic cells.
3. During the process of aging, the cells exhibit granules and vacuoles and the vacuole comes to possess a membrane delimiting it from the cytoplasm and sometimes a dancing body inside. Can these changes be considered as an example of differentiation-in-time in yeast?
pp 325-333 June 1956
A leaf spot disease ofCitrus acida var.variegata has been recorded. The disease is most conspicuous during rainy season and at the fall of winter in spring.
The symptoms of the disease have been described in detail.
Successful inoculation experiments have been performed both under field and laboratory conditions. Spores both from culture as well as those occurring in the acervuli of the leaves could bring about infection of the leaves. It was found that injury increased the rate of infection.
The morphological character of the pathogen has been described and the fungus has been identified as a new strain ofColletotrichum glœosporioides Penz. differing in several characters from other strains.
pp 334-339 June 1956
Paper partition chromatography by the ascending and disk methods has been applied to the study of muscle fromSardinella spp.,Leiognathus spp.,Caranx spp.,Hemirhamphus georgii andAtherina sp.
Experimental conditions have been standardised under which differences among species of fish could be made out qualitatively and on the basis of quantitative measurements, using fish tissue of varying degrees of freshness. Methods have been studied for the preservation of fish muscle for chromatographic work.
The applications of paper chromatography to problems in fishery biology have been indicated.