Journal of Bio-science 

About: Journal of Bio-science is an academic journal. The journal publishes majorly in the area(s): Murashige and Skoog medium & Shoot. Over the lifetime, 266 publications have been published receiving 1405 citations.

Genetic Variability, Diversity and Association of Quantitative Traits with Grain Yield in Rice ( Oryza sativa L.)

Abstract: Context: Genetic diversity is pre-requisite for any crop improvement programme as it helps in the development of superior recombinants. Objectives: Recognizing the importance of genetic diversity in plant breeding experiments, the present research work was taken up to estimate genetic diversity in different accessions of rice for various agro-economically important characters. Materials and Methods: Experiments were carried out with 40 Rice ( Oryza sativa L.) genotypes which were evaluated for yield and yield contributing traits in Kharif-2007-08. The data were recorded on 10 randomly selected plants from each replication for 12 quantitative characters studied. However days to 50% flowering was recorded on per plot basis. Mean values were subjected to analysis of variance to test the significance for each character. The genetic divergence was estimated and the grouping of the genotypes into cluster was done. Results: Sufficient amount of variability was found in the entire gene pool for all traits studied. The higher magnitude of genotypic and phenotypic coefficients of variation was recorded for plant height, grain yield per hill, harvest index and biological yield per hill. High heritability along with high genetic advance as percent of mean was registered for harvest index, grain yield, plant height, biological yield, test weight, number of tillers per hill and number of spikelets per panicle suggesting preponderance of additive gene action in the expression of these characters. On the basis of Mahalanobis D2 statistics the genotypes were grouped into seven clusters. Plant height, biological yield and test weight contributed considerably, accounting for 86.16 % of total divergence. The genotypes superior in some clusters may be involve in a multiple crossing programme to recover transgressive segregants with high genetic yield potential and early maturity. Conclusion: The promising genotypes selected from diverse clusters should be involved in the hybridization programme in order to transfer some of the desirable yield contributing characters consisted by them. Key words: Rice ( Oryza sativa ); genetic variability; diversity; clustering pattern DOI: 10.3329/jbs.v17i0.7110 J. bio-sci. 17: 77-82, 2009

Inhibitory Effect of Different Plant Extracts, Cow Dung and Cow Urine on Conidial Germination of Bipolaris sorokiniana

Abstract: Inhibition of conidial germination of Bipolaris sorokiniana was tested using eight ethanolic plant extracts, ten aqueous plant extracts in combination with cow dung and five aqueous plant extracts in combination with cow urine. Hundred percent of conidial germination was inhibited with the application of ethanolic extracts of Adhatoda vasica (leaf) and Zingiber officinale (rhizome) at 2.5% concentration. After the treatment with Vinca rosea , Piper betle and Azadirachta indica extracts in combination with cow dung suspension showed 100% inhibition of conidial germination; where the lowest was noted in case of Rauwolfea serpentina (30%) extract at same concentration. At 2.5% concentration of Calotropis procera extracts in combination with cow urine, 91% inhibition of conidial germination was observed. In most cases, Ocimum sanctum extract exhibited less inhibitory effect against B. sorokiniana . Key words: Bipolaris sorokiniana , Leaf blight, Plant extracts, Triticum aestivum , Cow dung, Cow urine. J. bio-sci. 14: 87-92, 2006

Serum Lipid Profile of Hypertensive Patients in the Northern Region of Bangladesh

Abstract: A prospective study was conducted in the Northern region of Bangladesh, to investigate the serum lipid profile viz the level of total cholesterol (TC), Triglyceride (TG), HDL-cholesterol and LDL-cholesterol of hypertensive patients and compares them with levels of control subjects. The results revealed that serum total cholesterol, triglyceride and LDL-cholesterol were significantly markedly raised (p>0.001) whereas the level of HDL-cholesterol was significantly lower (p>0.001) in hypertensive patients as compared to control subjects. No significant changes of serum lipid profile were found between male and female hypertensive patients, but in control subjects, markedly higher levels of serum lipid profile was observed in male compared to that of female. It was concluded that hypercholesterolaemia, hypertrigyceridaemia and low density lipoprotein are the main lipid abnormalities on the incidence of hypertension in the study area. Key words: Hypertension, Total cholesterol (TC), triglyceride (TG), HDL- cholesterol and LDL-cholesterol. J. bio-sci. 14: 93-98, 2006

Toxicity of Essential Oils Against Red Flour Beetle, Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae)

Abstract: Contact and fumigant toxicity of the three essential oils, viz., cardamom ( Elletaria cardamomum Maton), Cinnamon ( Cinnamomum aromaticum Nees), and Clove ( Syzygium aromaticum (L.) Merr. and Petry) were tested against the red flour beetle, Tribolium castaneum (Herbst) larvae and adults. Residual film bioassay was employed in Petri dish (5 cm dia.) for contact toxicity studies and 6cm × 1.8cm glass vials were used for testing fumigation actions. Three day old adults and 10- day old larvae were equally susceptible to the contact toxicity of cinnamon oil, with LD 50 values of 0.074 and 0.196 mg cm -2 respectively. Cardamom oil provided higher toxicity to 14-day and 18- day old larvae having LD 50 value of 0.10mg cm -2 . In fumigation bioassay cinnamon oil provided the highest toxicity to adult and 10-, 14-, and 18-day old larvae, with LD 50 values of 0.03, 0.05, 0.088 and 0.09 mg cm -3 respectively. Furthermore, 10-day old larvae were more tolerant than the adults to the contact toxicity of the essential oils, but 14- day old larvae had the same susceptibility as the adults. In contact and fumigation toxicity adults and all stages of larvae were more resistant to clove oil. Key words: Bioassay; cardamom; clove; toxicity; essential oil J. bio-sci. 14: 1-9, 2006

Effect of Intercropping with Mustard with Onion and Garlic on Aphid Population and Yield

Abstract: Field experiments were conducted to study the effect of intercropping of mustard (Brassica napus, Var Bari Sarisha-7) with onion (Allium cepa L) and garlic (Allium sativum L) on aphid [Lipaphis erysimi (Kaltenbach)] population and yield Intercropped with these two medicinal as well as spice crops reduced the aphid population significantly (P<005) Mustard blocks intercropped with garlic gave highest cost-benefit ratios (1:207 and 1: 296) than onion intercropped blocks Sole mustard blocks produced lowest cost-benefit ratios (1:165 and 1:206)