Volume 95, Issue 1
August 1985, pages 1-64
pp 1-5 August 1985
The data reported demonstrate the impact of polyploidy on plant phenotype and flavonoid constitution inNarcissus tazetta. Polyploidy induces increase in flower size and intensifies flower colour. The response of flavonoid constitution is variable. In some cases, flavonoid architecture does not register any change with the imposition of polyploidy. Whenever it does, the number of flavonoids is either increased or decreased. The probable explanation for such changes has been discussed.
pp 7-15 August 1985
Cotyledonary blade is symmetrical in all the species of Asteraceae. Morphological features such as base, apex and margin vary from species to species. Venation pattern conforms to pinnate craspedodromous, pinnate camptodromous and acrodromous type. Higher order veins noticed are up to 5°. Primary vein is either stout massive, moderate or weak. The thickness of the veins gradually decreases from primary to higher order veins. Marginal ultimate venation is either incomplete, looped or fimbriate. Areoles are absent inEclipta prostrata, Chrysanthemum segetum andCalendula suffruticosa spalgarbiensis. Vein endings are either simple or branched. In some species veins lack vein endings, which may or may not be associated with tracheids. Tracheids vary in their shape and arrangement in different species. Loop formation is observed. Isolated tracheids and extension cells are observed inCalendula suffruticosa sptomentosa. All categories of veins are jacketed by parenchymatous bundle sheath.
pp 17-19 August 1985
Seeds ofBiophytum vizB. helenae, B. intermedium, B. petersianum, B. reinwardtii andB. sensitivum are brownish, small (0·87 to 1·63 mm long), tuberculate and show distinct orientations of ridges and furrows and crystalliferous epidermal cells. On the basis of these characters a key is proposed to delimit the five species ofBiophytum.
pp 21-28 August 1985
Various types of stomatal abnormalities like persistent stomatal initials, single guard cells, degenerated guard cells and contiguous stomata with contiguity in different directions were recorded due to the treatment of different growth substances. Growth substances also altered the stomatal size, epidermal cell size, stomatal frequency, index and length-to-breadth ratio. It seems that the effect of these substances starts from the stomatal ontogeny and continue up to the last phase of development leading to such variations.
pp 29-33 August 1985
A new virulence analysis system for the wheat stem rust pathogen (Puccinia graminis f sptritici) based on three sets of differentials is suggested. Set A consists of eight single gene lines for stem rust resistance—Sr8, Sr9b, Sr9e, Sr11, Sr13, Sr28, Sr30 andSr37 (SrTt-2) and set B has five standard differentials—Marquis, Einkorn, Kota, Reliance and Khapli, and one supplementary differential—Charter. Set 0 includes two susceptibles, Agra Local (Wheat) and a local barley, one universal resistant and six cultivars. It shows the behaviour of selected cultivars to stem rust flora while variations in the pathogen are identified on sets A and B. The new nomenclature is based on binary notation and decanary values.
pp 35-40 August 1985
The adequate level of inoculum of a vesicular-arbuscular mycorrhizal fungus,Glomus mosseae, required for copious mycorrhizal formation in groundnut (Arachis hypogaea L) in sterilized soil was found to be one gram dried root powder from infected plants per kg soil and this level was used subsequently in an inoculation study. In two cultivars of groundnut, combined inoculation with aRhizobium sp andG. mosseae resulted in synergistic effect on the formation of mycorrhiza and nodulation when compared to separate inoculations. The combined inoculum resulted in fairly good response of the plants in terms of dry weight, uptake of nitrogen and phosphorus.
pp 41-46 August 1985
The effect of four levels of nitrogen (0, 20, 40 and 80 ppm) on the growth behaviour of two range grasses (i.e.Lolium perenne andPoa pratensis) was studied. The application of different doses of fertilizer increased the shoot and root biomass, the former to a greater degree. The inducing effect of increasing levels of nitrogen was more pronounced on the aerial parts than on the underground parts as indicated by decreasing root: shoot ratio. Different growth parameters such as relative growth rate, specific and total leaf area also increased significantly with increasing levels of nitrogen.
pp 47-49 August 1985
A process is described to fractionate the expressed alfalfa juice into green and white protein-rich fractions using alum. Fractional coagulation using heat yielded more white product than when alum was used. This was attributed to more protein precipitated in green fraction when alum was used. Protein precipitating ability of alum was seen to be as good as that of trichloroacetic acid. The cost of separation of green and white fractions using alum is likely to be low since the technique is simple and capital saving.
pp 51-64 August 1985
In this paper an account of 12 taxa of the genusRamaria (Fr) Bonorden collected from various localities in the eastern Himalayas and adjoining hills is given. Of the taxa includedR. rubella varhimalaica is described as new;R. rubrievanescens, R. rubripermanens, R. botrytis, R. strasseri andR. flaccida varlongiramosa are now records for the Himalayas; whileR. clarobrunnea, R. flaccida, R. pusilla, R. concolor andR. apiculata are the first records of their occurrence in the eastern Himalayas.