Browsing by Author "R.B. Singh"

Now showing 1 - 20 of 69

A study of gene effects in three wheat crosses
(1978) S. Singh; R.B. Singh
The joint scaling test of Cavalli (1952) and the six-parameter procedure of Jinks & Jones (1958) were applied to test the adequacy of the additive-dominance model and to estimate various main and interaction gene effects for five characters, namely, final plant height, ear length, number of spikelets per spike, number of grains per spike and yield per plant, in three wheat crosses (Kalyan SonaxNorteno 67, Norteno 67 x WL 212 and K. Sona x Moti). Goodness of fit of the model varied from cross to cross for the same character except for number of grains per spike and yield per plant for which the model was inadequate for all three crosses. The two methods were in complete agreement regarding the presence of epistasis in the material. Among the interaction parameters, the component [1] showed the greatest effect for most of the characters in all three crosses where there was evidence of epistasis. © 1978, Cambridge University Press. All rights reserved.
Adult polio‐like syndrome following Enterovirus 70 conjunctivitis (natural history of the disease)
(1983) B.C. Katiyar; S. Misra; R.B. Singh; A.K. Singh; Saroj Gupta; A.K. Gulati; Mrs.S. Christopher; T. Jacob John
ABSTRACT‐ During the Indian EV 70 conjunctivitis epidemic in 1981, 79 patients with neurological complications were evaluated by clinical, electro‐physiological, histopathological and virological studies. The disease was heralded by an attack of conjunctivitis and was followed, after a variable latent period, by a pre‐paralytic, paralytic, and post‐paralytic stage of slow recovery. The above events occurred in an orderly sequence. The paralysis affected the cranial nerves, limbs or both. The clinical course closely simulated poliomyelitis, without any evidence of radiculopathy or myelo‐pathy. Cranial nerve palsies were seen in approximately half of the patients. The electrophysiological and histological studies pointed towards the affection of anterior horn cells. The raised neutralizing antibody titres to Enterovirus 70, confirmed the aetiology of the disease. On the available data, we believe that this nosological entity should be considered under the general title of “polio‐like syndrome” following EV 70 conjunctivitis. On account of two epidemics in 1971 and 1981 with unfavourable prognosis and high resultant disability, and because of lack of specific therapy, it has become imperative to develop, as a top priority, a vaccine for immunization. 1983 Blackwell Munksgaard
Biosystematic relationships among Cajanus, Atylosia, and Rhynchosia species and evolution of pigeonpea (Cajanus cajan (L.) Millsp.)
(Springer-Verlag, 1985) R.P.S. Pundir; R.B. Singh
Biosystematic studies encompassing morphocytological and electrophoretic analyses of Cajanus cajan, seven species of Atylosia and one of Rhynchosia revealed that A. cajanifolia is closest to C. cajan, followed by A. lineata, A. scarabaeoides, A. sericea, A. albicans, A. volubilis, A. platycarpa and R. rothii, in that order. A revision has been suggested for the taxonomic placement of the seven Atylosia species. Regarding the evolution of cultivated C. cajan, three possible alternatives have been suggested. Firstly, C. cajan could have evolved through gene mutation in A. cajanifolia; secondly, some of the Atylosia species and pigeonpea probably evolved from the same source; and thirdly, the pigeonpea might have developed from naturally occurring interspecific crosses of A. lineata and A. scarabaeoides. © 1985 Springer-Verlag.
Blasting side effects - Investigations in an opencast coal mine in India
(shers, 1996) P.K. Singh; W. Vogt; R.B. Singh; D.P. Singh
Field investigations were conducted in a potential opencast coal mine in India with a view to optimizing blast patterns for controlling ground vibration, sound pressure level and fly rock within safe and tolerable limits. Blasting was performed in all operating benches i.e., alluvium, sandstone, shale, coal and blast vibrations were monitored on the alluvial soil present in the vicinity of the mine. It was observed that in all the blasting rounds, low frequency ground vibrations were generated. Further investigations were carried out by recording structural response to ground vibration on single and double storied buildings. It was observed that the ground vibrations were amplified by structures themselves, as much as 2.0 to 5.6 times.
Cardiac asystole due to lignocaine in a patient with digitalis toxicity
(1974) B.V. Agrawal; R.B. Singh; S.K. Vaish; H. Edin
An elderly female who had unusual manifestations of digitalis sensitivity and toxicity is presented. During treatment of digitoxic ventricular tachycardia by a 50 mg bolus of lignocaine both ventricular and atrial asystole (a previously undescribed manifestation of lignocaine sensitivity or toxicity) developed in this arrhythmia is discussed. Lignocaine in patients with ventricular dysrhythmias due to digitalis overdosage should be used with caution or better avoided.
Cardiac manifestations of digoxin intoxication. (Clinical correlations with serum levels)
(1975) R.B. Singh; G.P. Dube; K.P. Dube; B.C. Katiyar
Clinical, electrocardiographic and laboratory data were examined in 52 patients with cardiac arrhythmias and conduction defects due to digoxin intoxication. Forty six nontoxic patients were also studied for comparison. Blood urea concentration was significantly higher in toxic patients as compared to nontoxic ones (P less than 0.01). Ventricular bigeminy and trigeminy (38.6%), multifocal ventricular premature beats (25%) and second or third degree A-V blocks (25%) were very much prevalent. Fairly good correlations were observed between different cardiac arrhythmias and serum digoxin levels. Significantly higher mean serum digoxin levels were observed in patients with A-V block and multifocal ventricular premature beats as compared to patients with supraventricular arrhythmias.
Characterization of phenolic compounds in some Indian mango cultivars
(2004) U.P. Singh; D.P. Singh; Mandavi Singh; S. Maurya; J.S. Srivastava; R.B. Singh; S.P. Singh
Mangoes (Mangifera indica) are rich in phenolic acids as detected by high-performance liquid chromatography. The phenolics have prominent medicinal properties. Among six important commercial mango cultivars (Deshi, Langra, Chausa, Mallika, Dashahari and Amrapali) tannic acid was maximal in Mallika, while gallic acid was maximal in Chausa and all other varieties. Caffeic acid was maximal in Langra followed by Chausa and Amrapali. Many of the pharmacological properties attributed to mango might be due to the presence of phenolic acids in fairly significant amounts. © 2004 Taylor & Francis Ltd.
Crossability relationships among Cajanus, atylosia and Rhynchosia species and detection of crossing barriers
(Kluwer Academic Publishers, 1985) R.P.S. Pundir; R.B. Singh
Crossability of two cultivars of Cajanus cajan, eight species of Atylosia and one of Rhynchosia was investigated. Of the 73 combinations attempted, success was achieved in 12 cases. C. cajan crossed successfully with A. albicans, A. cajanifolia, A. lineata, A. scarabaeoides, and A. trinervia. Within the genus Atylosia, A. lineata crossed with A. albicans and A. scarabaeoides, and A. scarabaeoides with A. sericea. Three species A. platycarpa, A. volubilis and R. rothii did not cross with any other one. In most of the unsuccessful combinations, although the pollen germinated on the receiving stigmas, the pollen tube growth was inhibited inside the stigma or in the stylar tissue. © 1985 Veenman B.V., Wageningen.
Cultural, morphological and pathogenic variability of Alternaria tenuissima causing blight in pigeonpea of Eastern Uttar Pradesh
(Indian Phytopathological Society, 2016) Laxman Prasad Balai; A. Sinha; R.B. Singh; S.M. Yadav
Cultural, morphological and pathogenic variabilities of Alternaria tenuissima isolates from pigeonpea were studied. The radial growth of 17 isolates of the pathogen was tested at seven different temperature and PDA medium. The maximum mean radial growth of fungus at temperatures of 25°C and 30°C was superior to other temperatures. Whereas, the lowest mean colony diameter was obtained at temperatures of 10°C and 40°C. The radial growth of 17 isolates was superior at 7.0 pH followed by 6.5 pH at five different pH. The least radial growth was obtained at pH of 8.0. Average growth rate after seven days were found varied from 20.0 to 78.0 mm in different isolates. The isolates were categorized in four groups on the basis of variation in radial growth rate. Ten representative isolates from 17 collections were identified and each isolates differed in their conidial size, morphology, length, beak length, width and septal distance. Among the 12 pigeonpea genotypes evaluated against disease, ICP-7220 was found to be highly resistant to alternaria blight followed by IPA-7-2. The most susceptible genotype was MAL-24. Cumulative aggressiveness of different isolates of A. tenuissima also varied significantly on different pigeonpea genotypes. Two Isolates namely At17 and At45 were highly aggressive whereas Isolate At71 was least aggressive on different genotypes of pigeonpea.
Cytogenetic aberrations and morphological changes induced by insecticide treatments of barley seeds
(1977) B.D. Singh; Y. Singh; R.B. Singh
[No abstract available]
Cytogenetics of F1 hybrids between Cajanus and Atylosia species and its phylogenetic implications
(Springer-Verlag, 1985) R.P.S. Pundir; R.B. Singh
Cytogenetic relationships between two cultivars of Cajanus cajan and six species of Atylosia were investigated. Of the 12 cross combinations obtained, only seven could be studied. Meiotic chromosome pairing, pollen and ovule fertility in parental species and four F1 hybrids were near normal. Some meiotic abnormalities were observed in the Fls: A. lineata x A. scarabaeoides, A. scarabaeoides x A. sericea and C. cajan (UPAS 120) x A. trinervia, indicating varying degrees of chromosomal and genic differences between these species. These observations suggested that A. cajanifolia is the closest wild relative of C. cajan, followed by A. scarabaeoides, A. albicans and A. trinervia. Among the Atylosia species, A. sericea was closer to A. scarabaeoides than to A. lineata. © 1985 Springer-Verlag.
Cytomorphological Behaviour and Origin of Aneuploids in Tetraploid Pearl Millet (Pennisetum americanum (L.) K. Schum)
(1983) R. Sai Kumar; U.P. Singh; R.B. Singh; R.M. Singh
Aneuploids with 27- to 30-chromosomes were isolated in the progenies of induced tetraploids of pearl millet in a lower frequency in C2 generation. These aneuploids were apparently recovered through female transmission, which varied for aneuploid gametes with different chromosome numbers. Aneuploids could be distinguished from eu-tetraploids on a morphological basis. Cytological study showed that 27-chromosomes variant was characterized by a high frequency of univalents and their precocious splitting at AI followed by the formation of bivalents in addition to rare presence of trivalents and quadrivalents/cell. But bivalents were highly frequent in both hypertetraploids. Thus, a frequency of bivalent is suggestive of “preferential pairing”. Moreover, the induced bivalentization noted in both eu-and aneuploids of advanced generation tetraploids of pearl millet may be accounted to high selection pressure. © 1983, Japan Mendel Society, International Society of Cytology. All rights reserved.
Cytomorphological Behaviour and Origin of Unusual Chromosomal Variants in Pearl Millet (Pennisetum americanum (L.) K. Schum)
(1987) R. Sai Kumar; U.P. Singh; R.M. Singh; R.B. Singh
Cytogenetic manipulation induced in a crop may be useful in understanding the degree of tolerance of a crop to chromosomal changes, isolation of mutants, study of phylogeny and genetic nature of traits and productions of new cytogenetic stocks useful to the breeders. Cytogenetic studies on aneuploids (Sears 1956, Riley and Law 1965) are highly useful in crop improvement. Aneuploids have been used extensively in genetical and plant breeding researches (Hermsen 1970, Khush 1973, Rajhathy 1975 and Meijer and Ahloowalia 1981) and trisomics are the main aneuploids produced in case of diploids. In addition to different trisomics, other types of chromosome variants have been isolated in the progeny of triploid, translocation and other cytogenetical stocks of different plants (Gill et al. 1970, Jauhar 1970 in pearl millet; Ahloowalia 1966, 1970, 1971, 1982 in ryegrass; Ellerstrom and Sjodin 1966 in red clover; Rommel 1963 in barley and sugarbeet; Hagberg and Ellerstrom 1959 and Aastveit 1963 in rye). © 1987, Japan Mendel Society, International Society of Cytology. All rights reserved.
CYTOMORPHOLOGICAL BEHAVIOUR OF DOUBLE TRISOMIC IN PEARL MILLET [PENNISETUM AMERICANUM (L.) K. SCHUM]
(Indian Academy of Sciences, 1981) R. Sai Kumar; U.P. Singh; R.B. Singh; R.M. Singh
[No abstract available]
Cytomorphological Behaviour of Primary Trisomics in Pearl Millet (Pennnisefum americanum (L.) Leeke)
(1982) R. Sai Kumar; U.P. Singh; R.B. Singh; R.M. Singh
The desynaptic plant showed univalents ranging from 0 to 13 at diakinesis and metaphase I. In triploid plant 36 per cent of the cells showed eight chromosomes separating to one pole at anaphase I. The morphology, cytology and sterility studies were conducted in all the trisomics isolated. All the primary trisomics showed 6II + lIII or 7II+lI at diakinesis and metaphase I. The frequency of trivalents was reduced at metaphase I. The trivalent resumed in chain of 3, V-, Y-, frying pan, S-, J- and 4-shape configurations. Based on cytomorphological distinction, the 16 trisomies were grouped in five classes as bushy, awned, slender, dark green and tiny. © 1982, Japan Mendel Society, International Society of Cytology. All rights reserved.
Diallel analysis of heading date in rice (Oryza sativa L.)
(Springer-Verlag, 1980) S.L. Dwivedi; K.N. Rai; R.B. Singh
The genetics of heading date was investigated in an 8×8 diallel set of crosses involving diverse rice cultivars. Wr, Vr graph analysis revealed the presence of a complementary type of non-allelic interaction which apparently affected the position and slope of the regression line such as if there were overdominance. Omission of two interacting parents resulted in a 6×6 subset of diallel crosses from which, as observed in the Wr, Vr graph, the non-allelic interaction had disappeared and the regression line exhibited partial dominance. Estimates of the genetic components of variation were in close conformity with the results obtained from the Wr, Vr graph: the average degree of dominance, as measured by (H1/D)1/2, was in overdominance range in the interacting 8×8 set of diallel crosses whereas it was reduced to partial dominance in the non-interacting 6×6 set of crosses. Further analysis by a standardized deviations graph indicated that earliness was controlled, on the average, by an excess of dominant alleles. © 1980 Springer-Verlag.
Differential Responses of Host and Non‐host Substrata on Germination of Ascospores of Sclerotinia sclerotiorum
(1984) U.P. Singh; R.B. Singh
Effect of host.(Cicer arietinum L.) and some non‐host (Allium cepa L., A. Sativum L., Ocimum sanictum L., Azadirachta indica Juss., Zingiber officinale Roscoe. And Curcuma longa L.) substrata on the germination of ascospores io Sclerotinia sclerotiorum (Lib.) de Bary has been observed. Maximum germination was noticed on flower petals of gram (C.arietinum) with minimum time (2.5 h) for germ tube initiation. Among the non‐host substrate germination was completely inhibited on ginger rhizome peeling whereas delayed germination (after 12h) and lowest germination percentage (48%) as compared with other non‐hosts, were observed on turmeric rhizome peeling. It is suggested that ginger extract may be effective in controlling stem rot and wilt of gram incited by S. sclerotiorum in the field. Copyright © 1984, Wiley Blackwell. All rights reserved
Effect of buffer and pH on growth and protein content of carrot (Daucus carota L.) in liquid shake culture
(1981) R.P. Singh; B.D. Singh; R.B. Singh
Phosphate, succinate, acetate and maleate buffers were tested for buffering B5 liquid medium. Phosphate (0·02 M) and acetate (0·002 M) were the most suitable buffers as they promoted dry weight accumulation and nitrogen assimilation, they also exhibited less change in pH after 5 days cultivation of carrot cells. The pH increase from 5·5 up to 6·5 also increased the dry weight accumulation and cell size; pH 7·0 was detrimental to dry weight accumulation. © 1981 Indian Academy of Sciences.
Effect of Date of Sowing on the Incidence of Sclerotinia Stem Rot and Wilt of Gram (Cicer arietinum L.)
(1984) U.P. Singh; R.B. Singh
Gram (Cicer arietinum L.) was sown at different dates, viz., 15, 22, 29 Oct., 5, 12, 19 and 26 Nov., and 3 and 10 Dec. in 1978–1979 and 1979–1980 in four replications to enable observations to be made on the occurrence and severity of stem rot and wilt infection caused by Sclerotinia sclerotiorum (Lib.) de Bary. The plant height and canopy width were also measured and correlated with the disease intensity. Yield of each plot was taken as the criterion for suggesting to farmers the best period of sowing the gram crop. November was the most suitable period for this purpose. Copyright © 1984, Wiley Blackwell. All rights reserved
Effect of herbicide, alachlor, on growth & nitrogen fixation in cyanobacteria & rhizobia
(1978) V.P. Singh; B.D. Singh; R.B. Singh
[No abstract available]