Volume 71, Issue 2
February 1970, pages 47-77
pp 47-49 February 1970
pp 50-55 February 1970
Respiratory studies onS. rolfsii showed that its endogenous respiration was lower when sodium nitrate was used as the nitrogen source as compared with ammonium sulphate. The endogenous respiration of mycelium grown on either medium was not appreciably altered by the addition of the respective media in which the fungus was grown. On the contrary, the endogenous oxygen uptake and carbon dioxide output ofS. oryzae grown in sodium nitrate was accelerated with addition of the nitrate medium. This effect was not observed in the case of mycelium grown on ammonium sulphate medium. These results, along with changes in the RQ, are discussed in relation to the growth response of the two fungi in the nitrate and ammoniacal media.
pp 56-65 February 1970
A general similarity was seen in the structure of lesion and time of lesion formation by DEMV and SSMV inC. tetragonaloba. In addition to minute lesions visible one day after inoculation, a number of single cell-, few cell- and multiplecell-lesions formed on the inoculated leaves. Browning along the perimeter of the lesion and formation of thickened rings within, were the main features of the lesions. Browning occurred along the cell-walls of the infected cells where they were flanked by non-infected cells and seldom between infected cells within a lesion. The rings when continuous through an infected and non-infected cell showed thickening in the arcs lying in the infected cell while the other part remained hyaline. No change in lesion size was observed from the time infected cells could be recognized (6–8 hr.) to 6 days; no progressive degenerative changes were seen in the neighbouring cells with time. Presumably only cells that were directly infected during inoculation developed into lesions in these host-virus systems. With AcMV, browning of peripheral deposit was neither intense nor rapid. Single cell- and few cell-lesions only developed with CLLV and BLLV.
Viral inclusion bodies occurred from 4 to 12 hr. after inoculation in inoculated epidermal cells of leaves of systemic hosts of DEMV and SSMV, as well as in the local lesion host with SSMV, AcMV and CLLV.
pp 66-77 February 1970
In this paper are enumerated twenty-nine different species of fungi which are new host records for India.