Volume 56, Issue 4
October 1962, pages 185-258
pp 185-194 October 1962
Forest soils from Nilgiris collected under different plant covers at three altitude ranges (i.e., 7,300 ft. to 6,500 ft., 6,000 ft. to 5,400 ft. and 2,500 ft. M.S.L.) were analysed by routine methods for soil fungi, bacteria and actinomycetes to record their seasonal distribution and percentage occurrence of major groups of fungi.
The influence of season, soil type, altitude and the possible effects of degradation products of plant detritus, as well as that of microbial metabolites for the dominance/inhibition of soil fungi are discussed.
The importance of the study of the role of plant cover in the ecology of soil fungi is indicated.
pp 195-216 October 1962
pp 217-231 October 1962
The structure and vascular anatomy of the spikelet in the tribe Paniceæ has been studied. The present study reveals a striking similarity in the pattern of vascular supply to various parts of the spikelet in different species. An important feature is that the palea bundles arise conjointly with the laterals of its lemma and not from the vascular tissue destined to supply the floret proper (cf., Pooidæ where the palea bundles arise from the vascular tissue destined to supply the floret proper). This has been ascribed to extreme abbreviation of axes—the rachilla and the flower axis—so much so that their individuality has become altoghether obscure.
It has been concluded that the spikelet in the Paniceæ (and that of the Panicoideæ in general) has also arisen from a multi-flowered spikelet by suppression of the first floret to various extents and complete suppression of florets above the second floret followed by abortion of the rachilla.
The disposition of the various parts of the spikelet inPaspalum compactum reveals that the three glumes present are the I, II and IV and the III glume (lemma I) is conspicuously absent along with its subtended flower. This is contrary to the observations of earlier workers like Blatter and McCann (1935), Bor (1940), etc.
The occasional presence in the spikelet fascicle ofSetaria glauca of a second and third imperfect spikelet in addition to the normal perfect one, in place of bristle shoots (br2″b andbr1″b) strengthens and confirms Arber’s contention (1931) that each ultimate bristle shoot and not a single bristle is equivalent to a spikelet.
pp 232-236 October 1962
The start-shaped sclereids found in the three species ofNymphæa, namelyN. Stellata, N. rubra andN. lotus, are transformed parenchyma cells, which are probably produced to give rigidity and strength to the plant.
pp 237-242 October 1962
The strain ofEsch. coli has been made resistant to Stylomycin and Viomycin, wherein there is slight fall in the oxidizing power of glucose in case of Stylomycin and nearly no change in Viomycin resistant culture when compared with the oxidising power of normal culture.
pp 243-258 October 1962
1. The morphological and anatomical features of seven species ofArtocarpus have been studied and described at some length.
2. All species are trees of moderate or lofty habits. They are of uniform patterns; however, each species has certain peculiarities.
3. While most of the species have 2/5 type of phyllotaxy,A. lakoocha is distinct in having distichous arrangement with peculiar angular divergence.
4. There are unicellular as well as multicellular (glandular) hairs of different magnitudes in stem, leaves and stipules. They have some taxonomic significance.
5. The nodal anatomy reveals considerable uniformity in all species ofArtocarpus studied here. The node is uniformly multilacunar, like that ofFicus but differs from those members of Urticales that are essentially trilacunar.
6. The two stipules are characteristic and well suited to protect the young buds. They have been described and their morphological nature has been discussed at some length.