Volume 68, Issue 6
December 1968, pages 269-320
pp 269-278 December 1968
Utilization of four oligosaccharides (viz., maltose, sucrose, lactose and raffinose) as well as of the mixture of their hydrolytic products (viz., glucose, 1/2 glucose + 1/2 fructose, 1/2 glucose + 1/2 galactose and 1/3 glucose + 1/3 fructose + 1/3 galactose) by three isolates ofColletotrichum capsici (Syd.) Butler and Bisby obtained from leaf-spots ofCodiaeum variegatum Blume,Manihot esculenta Crantz andSolanum melongena L. was studied chromatographically. Sucrose, maltose and raffinose were consumed through a hydrolytic pathway, while none of the hydrolytic product could be detected in the medium containing lactose. The pathogens were also capable of utilizing the hydrolytic products of the oligosaccharides. All of them had synthesized an oligosaccharide during the utilization of sucrose and maltose. They failed to do so during the assimilation of lactose. OnlyManihot isolate ofC. capsici synthesized an oligosaccharide, when it was allowed to grow on raffinose. The growth of all the isolates was better on sucrose than on glucose-fructose mixture. They also exhibited better growth on a mixture of glucose and galactose than on lactose. The growth of all of them was inferior on maltose than on glucose.Codiaeum andSolanum isolates ofC. capsici grew better on raffinose than on a mixture of glucose, fructose and galactose.Manihot isolate of the same species, however, showed more or less identical growth on raffinose as well as on the mixture of its hydrolytic products.
pp 279-283 December 1968
About twelve per cent. cases of tetrasomaty were recorded in the secondary roots of seven distinctly different varieties ofCicer arietinum, Linn. The number of SAT chromosomes increased proportionately in the polysomatic types. In variety N 68 in addition to tetrasomatic cells, triplosomatic (2n=24) and aneusomatic cells (2n=18 and 20) were recorded.
pp 284-288 December 1968
Axillary bud trace connections in five species,Petrea volubilis, Clerodendrum sp. of the Verbenaceae, andLeucas aspera, Anisomeles ovata andOcimum americanum of the Labiatae have been investigated. The study shows the possibility of three types of trace connections of axillary buds in plants with opposite-decussate phyllotaxy. They are represented byPetrea, Leucas andOcimum. In the first case the bud trace is related to the vascular strand entering the axillant leaf; in the second the bud trace, the axillant leaf trace and the vascular strand traversing the internode above, arise from a single common strand; and in the third the bud trace has no relation with the axillant leaf trace.
pp 289-294 December 1968
1. Exocrine pancreas ofMystus gulio is diffused and is restricted to the anterior region.
2. It is also diffused inMegalops cyprinoides. The pyloric caeca are also found to be surrounded by the pancreas.
3. Both diffused and dispersed types are present inTilapia mossambica. The liver is actually a hepatopancreas.
4. InMystus gulio there are separate pancreatic ductules opening into the intestine along with the bile duct. InTilapia mossmbica the pancreatic ductules appear to open into the bile duct and the bile duct is in the nature of a hepatopancreatic duct. InMegalops cyprinoides there are indications of pancreatic ductules entering the intestine here and there.
pp 295-300 December 1968
Total carbohydrates were significantly less in virus diseased pigeon pea leaves at all ages below the second leaf than in comparable healthy leaves. While the total carbohydrate content increased with age in healthy plants, no such regular pattern was discernible in diseased leaves. Starch and resin were significantly lower in diseased leaves than in healthy leaves and sucrose levels were not significantly different. Increased levels of reducing sugars and non-fermentable reducing substances were observed in diseased leaves over healthy leaves.
pp 301-303 December 1968
Phyllagathis pulcherrima Nayar, an interesting new species of Melastomataceae, is described with illustrations.
pp 304-307 December 1968
A condition resembling blister blight of tea on tea seedlings in quarantine was reported from New Guinea and although the causal fungus was not seen associated with the blisters it was felt that the mal-formation could have resulted from infection by the fungus which was prevented from sporulation by adverse climatic conditions. Similar malformations on tea seedlings have been observed in Ceylon and India and this article endeavours to show that they are in no way connected with the blister blight fungal disease of tea and to allay fears that the blister blight disease is seed-borne.
pp 308-313 December 1968
An agar nutrient medium has been defined for growing hybrid embryos from 28-crosses between maize and sugarcane. Embryos excised 5–7 days after pollination gave a high percentage of germinationin vitro. This study has demonstrated the possibility of overcoming hybrid inviability or weakness in the incompatible matings between maize and sugarcane.
pp 314-320 December 1968
Studies were carried out in male albino rats on the influence of age, castration and substitution by testosterone on urinary amino acid excretion pattern and excretion of 17-hydroxy corticoids in the urine.
While age had no effect on amino acid excretion, corticoid activity decreased with age.
Castration caused increased excretion of amino acid and slight increase in corticoid excretion, testosterone produced nitrogen retention and decrease in corticosteroid excretion.