Volume 70, Issue 5
November 1969, pages 193-249
pp 193-199 November 1969
Investigations on the intracellular free amino-acids ofSclerotium rolfsii (Sacc.) andSclerotium oryzae (Catt.) were carried out. The mycelia analysed after growing the fungi on different nitrogen sources showed qualitative similarity of amino-acid composition. The concentration of individual amino-acids as well as the total amino-acid content was found to vary with the species and dependent on composition of the medium especially the nitrogen source. Asparagine was found to occur invariably inS. oryzae but not inS. rolfsii when grown on different nitrogen sources.
pp 200-207 November 1969
Diseased pigeon pea leaves at all ages had a higher level of total nitrogen than comparable healthy leaves. While increased levels of nitrate nitrogen, nitrite nitrogen, amide nitrogen and protein nitrogen were observed in diseased leaves, ammoniacal nitrogen and non-protein nitrogen recorded a fall in diseased leaves. The levels of both free and bound amino-acids increased in diseased leaves at all ages. A high concentration of free amino-acids like valine, leucine and arginine was observed in young diseased leaves. These were in lower concentration in older diseased leaves. Their probable incorporation into the virus protein is suggested by the finding of a high level of these amino-acids in the bound form in diseased leaves.
pp 208-214 November 1969
The study of the protozoan fauna of insects revealed a number of flagellates, sarcodines and ciliates. In the present text consideration is given only to the genusMonocercomonoides, and three new speciesM. garnhami n.sp. fromPeriplaneta americana, M. ganapatii n.sp. fromGryllotalpa africana andM. qadrii n.sp. from the larva of the dungbeetle,Oryctes rhinoceros are described in detail and are claimed to be new to science on the basis of their size, nuclear structure and the mastigont elements.
pp 215-222 November 1969
The floral anatomy ofAncistrocladus heyneanus, the only representative in India of the genus, is studied. The nipple-like projection above the ovary is shown to be the upper part of the ovary itself and not the basal connivant part of the styles as commonly mentioned inFloras and adopted by Keng in his paper onA. tectorius. A number of earlier observations and conclusions are shown to be due to faulty interpretations of the structure.
pp 223-231 November 1969
Field and laboratory observations on the wood-borer,Teredo furcifera M., have been made with a view to assessing its suitability as test organism for the bioassay of toxic preservatives. This wood-borer breeds throughout the year in Bombay harbour. It attains sexual maturity when it is barely 20 days old and may liberate larvae after 55 to 60 days in the laboratory tanks if fed on nanoplankton through a system of running sea-water. It has become possible to raise several generations of this borer in the aquaria. Pediveliger larvae under laboratory conditions may attack timber within 24–72 hours and their settlement is independent of salinity, light intensity and the ‘primary film’. The larvae need no food prior to their settlement. Adults may live exclusively on timber for over 4 months and need no nanoplankton for their sustenance. The laboratory life of this species has been found to be not less than eighteen months. Some preliminary toxicity experiments have been described and the advantages of using this wood-borer as a test organism for the bioassay experiments have been discussed.
pp 232-240 November 1969
The present paper describes the distribution, structure, ontogeny, function of foliar nectaries and structure and ontogeny of stomata inBignonia chamberlaynii Sims. The mature nectaries are patelliform and originate from a single papillate epidermal cell. They consist of 1-layered base (foot), 2-layered stalk and 1-2-layered palisade-like epithelial cells which secrete sugary fluid.
Tha mature stomata are anisocytic, anomocytic, paracytic, perigenous (tetracytic and amphicyclic), with a single subsidiary cell. The ontogeny of anisocytic, paracytic and stomata with a single subsidiary cell conforms to the mesogenous type, while that of the anomocytic, tetracytic and amphicyclic ones is perigenous. Abnormalities noticed here are contiguous (juxtaposed and superposed) stomata, stomata with a single guard cell and aborted guard cells.
pp 241-247 November 1969
15 species have been investigated for oil contents and their chemical constituents in relation to their cytological make-up. The three series ofCymbopogon were found to have different chemical constituents in their oils. Specific chemical compounds have been assigned as markers of each series. Piperitone being found only in theSchoenanthi while geraniol is dominant in theRusa and citronellal or citral in theCitrati. Polyploid races have been found to have more than one of these markers. Nature of their oils has been correlated with cytological observations, and evidences for their allopolyploid origin have been put forward. The polyploid races within species range have been found rich in their oil contents.
pp 248-249 November 1969