Volume 98, Issue 1
February 1988, pages 1-66
pp 1-12 February 1988
The status of IndianBrachiolejeunea (Spruce) Schiffn. is discussed. The species described earlier under this genus belong to closely allied generaFrullanoides Raddi orTrocholejeunea Schiffn.Frullanoides Raddi is known only byFrullanoides tristis (Steph.) Van Slageren which has been discovered recently from Nilgiri hills (Tamil Nadu) and Nandi hills (Karnataka) in southern India.Trocholejeunea is represented by two species,Trocholejeunea infuscata (Mitt.) Verd. from eastern Himalayas andTrocholejeunea sandvicensis (Gott.) Mizut. from Palni hills (Tamil Nadu), south India and western Himalaya. Of theseTrocholejeunea sandvicensis has been, discovered for the first time from western Himalaya which also shows intracapsular spore germination of theLopholejeunea-type. The scanning electron microscopic details of sporoderm ofFrullanoides tristis andTrocholejeunea sandvicensis have been given.
pp 13-23 February 1988
Growth and allocation patterns of biomass and nutrients of herbaceous species from grasslands at Cherrapunji in north-eastern India were studied under varied nutrient stress situations. Though populations from a nutrient richer soil had better growth rate than those from nutrient poor sites, this difference was not reflected in the tissue concentration of nutrients. Populations in nutrient deficient soils had high allocation to the belowground organs of reproduction than for aboveground parts. ThoughIschaemum andEragrostiella had generally lower nitrogen uptake efficiencies, their use efficiency was fairly high. Soils that are generally nutrient deficient had more C4 grass components than the rich soil underOsbeckia-type.
pp 25-30 February 1988
By sampling air with rotorods at different heights above ground level and at different times of the day it was possible to characterise the diurnally changing abundance of fungal spores and also the vertical profiles of changing concentrations within and above a crop of rice at Bhimavaram, Andhra Pradesh.
The spores of some fungi, notablyNigrospora, Myrothecium andCladosporium were more abundant between 0800 and 1100 h than at other times of the day. In contrast maximal concentrations ofLeptosphaeria spores were detected between 2400 and 0300 h. Idealised theoretical profiles showing logarithmic decreases in spore concentrations with increasing height were always obtained when considering total spora but for individual spore types they were only obtained during their periods of maximum atmospheric concentrations. Unlike the profiles of other fungi those of the false smut fungusUstilaginoidea virens tended to show increasing concentrations both above and below crop level.
pp 31-39 February 1988
Sclereids and tracheoids are found to be key characters to distinguish the taxa included under the Pandaceae. Their presence or absence appears to be a strong evidence thatMicrodesmis andCentroplacus, andPanda andGalearia can be grouped under two sections, anatomically. The vein termini sclereids inAnthodiscus and brachytracheoids inCaryocara of the Caryocaraceae are useful to distinguish the two genera from one another.
pp 41-48 February 1988
The north-western Himalayan ranges were surveyed for nodulating legumes that could be useful in tropical afforestation, soil amelioration and reclamation of open cast mine sites, mine spoil heaps, eroded slopes and other denuded ecosystems. Seven new nodulating papilionoid legumes were found and all of them have potential application in revegetation programmes. One new record of a non-nodulating papilionoid member is also reported. The ecological aspects of sampling sites, and habit and root characteristics of the legumes are described. The patterns of nodulation and morphology of nodules are also given. There is a substantial amount of polymorphism in nodule size and shape within a single species as well as among the species; a part of this variation is habitat induced. The nodulation occurs essentially during monsoon season. The remarkable similarity in growth form and nodulation patterns among 7 taxa is the consequence of adaptation to similar ecological conditions.
pp 49-53 February 1988
Inoculation of 15–30 day clusterbean plants byXanthomonas campestris pv.cyamopsidis resulted in death of many plants due to rotting of stem whereas in 60–75 day old plants infection was confined to foliage only. There was negative correlation between disease severity and host age. Both temperature and duration of free moisture on plant surface influenced disease severity. Infection occurred at 20–35°C, 30°C being optimum and increased with increased period of free moisture availability.
pp 55-59 February 1988
Extensive mycorrhizal infection of sesamum under field conditions was observed. The plants were found to be mycorrhizal even in the early stages. There was a progressive increase in mycorrhizal infection up to 6 weeks, then declined slightly. A gradual increase in vesicle count per 1 cm segment as the plants aged was noticed. Species ofGlomus, Gigaspora andSclerocystis were found in the rhizosphere soil. Among the spore types recorded, chlamydospores ofGlomus, especiallyGlomus mosseae were predominant.
pp 61-66 February 1988
Exogenous application of 1-amino; 4-sulphonate, β-naphthol; 8-amino; 3–6 disulphonate, γ-naphthol; 1, 3-dihydroxybenzene and 4, 6-Bis (diazonaphthalene sulphonate-resorcinol) 5, 20, 50 ppm) increased number of pods per plant, number of seeds/pod and improved the yield (kg/ha) in chickpea. Some of the compounds enhanced total free amino acids and soluble protein and total soluble sugars. The effects of the phenolic acids on growth and development were independent of their structural configuration.