Bhanu Priya

Genetic Variability and Inter-relationship Between Fibre Yield and its Components in Roselle (Hibiscus sabdariffa L.) in Terai zone of West Bengal

Genetic variability, correlation and path analysis were studied in a set of sixty diverse genotypes of roselle (Hibiscus sabdariffa L.) dur-ing Kharif, 2013 at Uttar Banga Krishi Viswav-idyalaya, Pundibari, Coochbehar, West Bengal for eleven important traits. Phenotypic as well as genotypic coefficients of variability were high for the important productivity characters like fibre yield plant−1, dry stick weight plant−1 and green weight plant−1 (for PCV) and medium for other characters like plant height, intermodal length and petiole length. High heritability coupled with high expected genetic advance was ob-served for fibre yield plant−1, dry stick weight plant−1 and green weight plant−1. Fibre yield per plant was found to be significantly and positively correlated with all the characters both at pheno-typic and genotypic levels except petiole length which was significantly correlated in negative direction. Plant height, base diameter, mid diam-eter, green weight plant−1 and dry stick weight plant−1 also exhibited significant positive inter correlation among themselves. Partitioning of correlation coefficients of various components upon fibre yield plant−1 into direct and indirect contributions revealed that dry stick weight plant−1 has maximum direct effect upon fibre yield plant−1 followed by plant height and mid diameter.

Principal component analysis for seed yield traits in roselle (Hibiscus sabdariffa L.)

Sixty genotypes of roselle (Hibiscus sabdariffa L.) were evaluated at three different agro-climatic zones viz., North Coastal Zone of Andhra Pradesh, Indo-Gangetic Zone and Terai Zone of West Bengal for seed and its contributing characters during kharif, 2013 and 2014. Principal Component Analysis (PCA) indicated that three components with eigen values more than one accounted for about 79 % of the total variation among ten quantitative characters responsible for seed yield in roselle genotypes. The principal components PC1, PC2 and PC3 contributed about 48.35 %, 21.22 % and 9.57 %, respectively to the total variation. The first principal component had high positive loading for test weight, plant height @130 DAS, seeds per pod, plant height @75 DAS, pods per plant and days to 50% flowering which contributed more to the diversity. The second principal component had high loading for pods per plant, seed yield/plant, test weight, plant height @130 DAS and @75 DAS. The genotypes viz., AR-71, AR-55, REX-34, AS-80-26, AS-81-1, AS-80-19, ER-60, AS-81-22, AS-81-2 and REX-38 were identified as the most diverse genotypes, based on component scores and these genotypes could be utilized as parents in hybridization programme.

Multivariate Analysis of Quantitative Characters for Fiber Yield in Roselle (Hibiscus Sabdariffa L.) Over Six Environments

Multivariate Analysis of Quantitative Characters for Fiber Yield in Roselle (Hibiscus Sabdariffa L.) Over Six Environments Sixty genotypes of roselle (Hibiscus sabdariffa L.) were evaluated at three different agro-climatic zones in India viz., North Coastal zone of Andhra Pradesh, Indo-Gangetic zone and Terai zone of West Bengal for fiber yield and its contributing characters during Kharif, 2013 and 2014 for twelve characters. Principal component analysis (PCA) indicated that three components (PC1 to PC3 ) with eigen values more than one accounted for about 88% of the total variation among twelve quantitative characters in roselle genotypes. The principal components PC1 , PC2 and PC3 contributed about 74.56%, 8.24% and 5.04% respectively to the total variation. The first principal component had high positive loading for dry stick weight, plant height, fiber yield and green weight (leafless) which contributed more to the diversity. The second principal component had high loading for petiole length, dry stick weight and fiber yield. The genotypes viz., ER-60, REX-34, AS-81-22, REX-6, R-284, AR-71, R-30, R-37, ER-57 and AS-80-7 were identified as the most diverse genotypes, based on component scores for use as parents in hybridization programme. High degree of variability existing within the accessions and the characters will help for further improvement of the rosella crop by evolving high fiber yielding cultivars...

Effect of different nanoparticles on germination and seedling growth in tomato

Nanotechnology, the process to generate, manipulate and deploy nanomaterials, represents an area holding significant promise in agricultural scenario. The present experimental investigation demonstrated the effect of nano ZnO, P and Anatase-TiO2 (<100 nm size), particles on the seed germination and seedling growth of tomato (Solanum lycopersicum) using local variety Patharkuchi. Tomato seeds were treated with different concentrations of nanoscale ZnO (0, 2, 4, 8, 10 and 14 ppm), P and TiO2 (0, 10, 20, 30, 40 and 50 ppm) including control and their effect was studied on seed germination and seedling growth at 25 days. The experiment was conducted on RBD with three replications. Application of nZnO, P and TiO2 significantly enhanced the characteristics of seed germination and seedling growth for most of the treatments as compared with control. Based on biomass assay, it was found that the seedlings displayed good growth over control, demonstrating a positive effect of the nanoparticle treatment. The response to nano treatment on seed germination along with seedling growth suggested optimum dose limit on these characters and decreased concentration of the performance in highest concentration could be explained as toxic effect of nanoparticle. A significant positive effect on these parameters in different concentrations nanoparticle could be due to highly positive responses of nanoparticle on various seedling growth characteristics.