Volume 78, Issue 6
December 1973, pages 241-291
pp 241-256 December 1973
The carbon and nitrogen nutrition ofClaviceps microcephala, isolated from the ear heads ofPennisetum typhoides, was studied at 24°C for 20 days at pH 6·0. Out of forty-one carbon compounds tested, the pathogen showed excellent growth on dextrose, sucrose, pectin and methyl alcohol; good on mannose, fructose and maltose; fair on galactose, cocount oil and isopropyl alcohol; and poor or no growth on rest of the carbon compounds. Out of thirty-three nitrogenous compounds tested, the pathogen showed excellent growth on casein hydrolysate, yeast extract, asparagine, peptone, proline, glutamic acid and aspartic acid; good on ammonium nitrate and ammonium oxalate; fair on ammonium chloride, ammonium sulphate, arginine mono HCl and ammonium phosphate; and poor or no growth on rest of the nitrogen compounds. In general, compounds which supported best mycelial growth ofC. microcephala yielded its excellent sporulation andvice versa.
pp 257-274 December 1973
pp 275-281 December 1973
1. Oxygen consumption of freshwater field crabParatelphusa hydrodromous shows surface area dependance.
2. Males consume more oxygen than females.
3. The crabs do not show seasonal acclimatization; the summer individuals consume more oxygen than the winter individuals.
4. Presence of diurnal rhythm of oxygen consumption is demonstrated.
pp 282-291 December 1973
The structure and development of male and female gametophytes, endosperm and embryo are described forVaccinium nummularia Hook.,V. retusum Hook. andV. serratum Weight. A comparison of embryological information presented here with that of other species given by previous workers shows general agreement in all the vacciniums. In view of the similarities between the vacciniums and the subfamilies of Ericaceae, the grouping of Vaccinioideae as a subfamily with the rest of Ericaceae, as against the erection of the family Vacciniaceae, is supported.