Development of a model for investigation of perennial ryegrass toxicosis in sheep     

MD Combs  SH Edwards  JM Scherpenhuizen  EJ Narayan  AE Kessell  J Piltz 《New Zealand veterinary journal》2018,66(6):281-289

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Genetics and molecular mapping of gynoecious (F) locus in cucumber (Cucumis sativus L.)     

Gograj Singh Jat  Anilabh Das Munshi  Tusar Kanti Behera  Harshwardhan Choudhary  Prasanta Dash  Amarnath Ravindran 《The Journal of Horticultural Science and Biotechnology》2019,94(1):24-32

Gynoecious is an important economic trait of cucumber for determinant of earliness and yield, yet genetic mechanism is not well understood for this trait. The experiment was conducted using F₂ mapping population by crossing of PPC-2, a gynoecious and parthenocarpic line with Pusa Uday (monoecious and non-parthenocarpic cultivar). Out of 179 SSR markers screened, 39 markers differentiated the gynoecious and monoecious parents. However, only 17 markers were segregating with F₂ mapping population, those were used for genotyping and linkage map analysis and these markers were placed along with F locus on chromosome 6 covering a total distance of 100.4cM. The SSR markers, SSR13251 and UW020605 were found to be closely linked to gynoecious (F) locus at 1.0 and 4.5 cM, respectively. The segregation of F₂ population of PPC-2 × Pusa Uday and GPC-1 × Punjab Naveen and test crosses for sex type herein suggested that single dominant gene controlled the gynoecious sex expression in cucumber particularly in gynoecious genotypes PPC-2 and GPC-1. Therefore, the monogenic dominant nature of gynoecious sex identified in the present experiment and SSR markers closely linked to the F locus will be useful in marker-assisted backcross breeding for transfering gynoecious trait into horticulturally desirable varieties.  相似文献   

Gaseous carbon emission in relation to soil carbon fractions and microbial diversities as affected by organic amendments in tropical rice soil     

P.K. Dash  K.S. Roy  S. Neogi  A.K. Nayak 《Archives of Agronomy and Soil Science》2013,59(10):1345-1361

The interactive effects of moisture and organic amendments (farmyard manure (FYM), crop residue (CR) and green manure (GM) (Sesbania aculeata) on gaseous carbon (C) emission, soil labile C fractions, enzymatic activities and microbial diversity in tropical, flooded rice soil were investigated. The amendments were applied on equal C basis in two moisture regimes, that is, aerobic and submergence conditions. The CO₂ production was significantly higher by 22% in aerobic than in submergence condition; on the contrary, the CH₄ production was 27% higher under submergence condition. The labile C fractions were significantly higher in GM by 26% under aerobic and 30% under submergence conditions, respectively, than control (without any kind of fertilizer or amendments). Eubacterial diversity identified by PCR-DGGE method (polymerase chain reaction coupled with denaturant gradient gel electrophoresis) was higher under GM followed by FYM, CR, and control and it is pronounced in submerged condition. GM favored the labile C accumulation and biological activities under both submergence and aerobic conditions, which makes it most active for soil–plant interactions compared to other organic amendments. Considering environmental sustainability, the use of GM is the better adoptable option, which could enhance labile C pools, microbial diversities in soil and keep soil biologically more active.  相似文献   

Zur Wirkung der Partikelgröße der Imaginalnahrung auf die Eizahl vonTribolium castaneum (Hbst.) (Col., Tenebrionidae)     

R. Narayan Singh  S. S. Krishna 《Journal of pest science》1985,58(1):17-18

Whole and intact wheat grains or those broken into 2 or 8 equal pieces and supplemented with yeast provided as adult food to individuals ofTribolium castaneum considerably reduced the egg output in these beetles although their larvae were reared on finely powdered yeast-supplemented whole wheat flour. However, egg fertility in all the three dietary situations was 100%.  相似文献   

On the origin of phenolic compounds in the wood rays of Abies alba     

Narayan Parameswaran  Josef Bauch 《Wood Science and Technology》1975,9(3):165-173

Summary The development and localization of phenolic compounds in sapwood and heartwood of Abies alba Mill. have been studied using cytological and UV-microspectrophotometric methods. The synthesis of phenolic substances was apparently initiated in vesicles developing from rough ER of the ray parenchyma cells in sapwood. They are different from the phenolic material in the pit membrane and cell wall of heartwood. There was no indication to suggest that the polyphenols in the cell wall of heartwood were either derived from or identical with the phenolic substances in the lumina of ray cells.Dedicated to Prof. Dr. H. von Pechmann on the occasion of his 70th birthdayWe are thankful to Professor Dr. Walter Liese for his support and to Mrs. R. Schultze and Miss R. Endeward for technical assistance.  相似文献   

The Genetics of Mortality and Survival of Broiler Chicks Infected as Embryos by Subgroup A Rous Sarcoma Virus     

Rout PK  Dash BB  Pani PK 《Veterinary research communications》1999,23(1):53-68

A study using two high-performance broiler lines, a synthetic male line (SML) and a synthetic dam line (SDL), was undertaken to investigate the pattern of mortality due to induced liver tumours (LT) and the immune response to subgroup A virus inoculated via the chorioallantoic membrane (CAM) route. The distribution patterns of the four possible phenotypes were similar in both sire and dam lines. The occurrence of conversely associated phenotypes was about 30% in both the lines. The percentages of CAM(+) LT(–) and CAM(–) LT(+) were 14.26% and 14.46% in the dam line and 20.0% and 9.57% in the male line. The LT mortality was 30–50% in the birds with low pock counts, whereas it was 80–93% in the birds with high pock counts. The group specific antigen shedding status did not influence death due to LT. In birds in the high pock count group, 98% of deaths due to LT were completed by the sixth week, whereas in those in the low pock count group, death due to LT was spread over 24 weeks. The SDL birds survived better than SML birds in the high pock count groups. In both lines, about 20% of deaths occurred owing to non-specific causes. The average survival time after hatching before death from LT was 26 days, whereas that for non-specific death was 81 days.  相似文献   

Evaluation of control populations: Body weight and rate of gain in Japanese quail     

A. D. Narayan 《British poultry science》1977,18(1):107-114

1. Two control populations of quail of different origin were maintained by cyclical mating, one for 4 and the other for 6 generations. Means, heritabilities, genetic and phenotypic correlations of body weights at 1, 14 and 35 d and rates of gain from 1 to 14 d and from 14 to 35 d did not show any trend of change with generation.

2. The variability between generations was greater in the characters having intermediate and lower values of heritability, genetic and phenotypic correlations than in those with higher values.  相似文献   

Inheritance of body weight and rate of gain in Japanese quail     

A. D. Narayan 《British poultry science》1976,17(5):513-523

1. The effects of hatch date, location and sex on the body weight and rate of gain in Coturnix coturnix japonica were examined.

2. The data conformed to a mixed model and adjustments were made for the fixed effects sex, hatch date and location. Adjustment improved the precision of the estimates by reducing the error variances significantly.

3. Rearing equal numbers of birds from each family at different locations made the interactions negligible.

4. Weight gain was greater if illumination intensity up to 35 d was less.

5. Females were not heavier on the 1st day but were heavier on the 14th and 35th days than males.

6. Variance components and genetic parameters were estimated.  相似文献   

Antibody dependent haemolysin, complement and opsonin in sera of a major carp, Cirrhina mrigala and catfish, Clarias batrachus and Heteropneustes fossilis     

Kunal Saha  Kalpana Dash  Arvind Sahu 《Comparative immunology, microbiology and infectious diseases》1993,16(4):323-330

The present communication is a continuation of our earlier study on the natural serum haemagglutinin/lectins of Cirrhina mrigala, Clarias batrachus and Heteropneustes fossilis. Sera of Cirrhina mrigala, belonging to the major carp family, could not only agglutinate heterologous rabbit erythrocytes, but also lyse them spontaneously. This lysis of rabbit RBC by Cirrhina mrigala sera was calcium ion dependent and heat sensitive, indicating thereby that the haemolysis was mediated by the fish serum complement system via the classical pathway. Quantification of CH50 and APCH50 levels in the sera of Clarias batrachus and Heteropneustes fossilis as well as in the sera of amphibia, aves and mammals showed that lower vertebrates predominantly possessed an alternative pathway of the complement system, while on the other hand, in the higher vertebrates the major pathway of complement activation was classical. Furthermore sera of Clarias batrachus and Heteropneustes fossilis had opsonins, which could stimulate heterologous rat peritoneal macrophages to engulf Staphylococcus aureus with the production of superoxide anion. From this study we concluded that fishes have been armed with various powerful natural humoral defense systems for their protection against environmental pathogens.  相似文献   

A new influenza A virus infection in turkeys II. A highly pathogenic variant, a/turkey/ontario 772/66.   总被引：8，自引：2，他引：6       下载免费PDF全文

G Lang  O Narayan  B T Rouse  A E Ferguson    M C Connell 《The Canadian veterinary journal. La revue veterinaire canadienne》1968,9(7):151-160

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