Subhra Mukherjee

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.

Genetic Control on Yield and its Attributing Traits in Rice withn Combining Abilities of the Parent for the Traits

Eleven genotypes of rice were evaluated for different yield and its attributing characters. Out of these eight parents were chosen as female and three parents were considered as male. These lines and tester were combined following Line × Tester crossing design to estimate combining abilities (gca effect) of Parentts and crosses (sca effect). Line × Tester analysis confirmed the influence of sca variance on most of the yield related characters which predicted that some characters were predominantly controlled by dominance gene actions with substantial amount of epistatic gene interactions. Some genotypes were found to be high general combiners for yield plant-1 with number of yield related characters like number of grains plant-1 and number of grains panicle-1.

Studies on Genetic Diversity in Roselle (Hibiscus Sabdariffa L.) For Seed Yield and It’s Contributing Traits in India

Studies on Genetic Diversity in Roselle (Hibiscus Sabdariffa L.) For Seed Yield and It’s Contributing Traits in India Sixty genotypes of roselle (Hibiscus sabdariffa L.) consisting of 45 indigenous, 11 exotic genotypes and four released varieties 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 seed yield and its contributing characters during Kharif, 2013 and 2014 for ten characters and grouped into six clusters based on D2 analysis. Cluster I comprised of thirty five genotypes followed by Cluster II with thirteen genotypes. Intercluster distance was highest between the Clusters III and IV followed by Clusters I and IV, whereas Intra-cluster distance was high for Cluster V which consists of five genotypes. Cluster II recorded highest and high values for yield and its attributing characters followed by Cluster I, whereas, Cluster IV recorded lowest and low values for yield and its attributing characters followed by Cluster V. Test weight contributed high for the diversity followed by seed yield followed by seeds per pod and pods per plant. The genotypes belonging to Cluster, II, III and IV viz., AR-80, AS-81-9, AS-81-17, AR-19, AR-71, R-16, AS-81-5, R-67, AR-14, R-48, R-225, R-134, AR-55, ER-60, AS-81-22, AS-80-19, AS-81-2 and REX-34 could be selected as parents in future breeding programme for developing high seed yielding varieties.

Genetic analysis for identification of terminal heat tolerant genotypes in wheat

A study was conducted to analyze divergence in 49 genotypes of bread wheat (Triticum aestivum L.) under terminal heat stress environment. The results indicated a good amount of genetic divergence among the wheat genotypes under heat stress. The genotypes were grouped into five clusters with maximum intra cluster distance of 70.392 (Cluster V) and maximum inter cluster distance was recorded between clusters III and V (72.11). Principal component analysis extracted seven principal components accounting 80.9% of total genetic variation. The identification of genotypes displaying heat stress tolerance may be useful in breeding.

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 Soil Moisture Stress against Irrigated Condition on Tossa Jute

Effect of Soil Moisture Stress against Irrigated Condition on Tossa Jute Drought is worldwide major abiotic stress in agriculture which affecting yield and yield stability of food cereals and this stress acts simultaneously on many traits leading to a decrease in total biomass. Approximately 16% of India’s geographic area, mostly arid, semi-arid and sub-humid is drought prone area. The main reason of drought is irregular rainfall, deforestation, industrialization, wide variation in climatic conditions etc..

Screening for Moisture Stress Tolerant Genotypes in C. olitorius L. on the Basis of Seedling Characters

Most cultivars of C. olitorius (tossa jute) suffer extremely during early growth phase either due to lean season or insufficient rainfall to maintain steady growth. Tolerant genotypes may overcome this problem maintaining sustainable growth at early growth. Sixty genotypes of C. olitorius were evaluated for identification of moisture stress tolerant genotypes using PEG, in field and pot under rainfed condition. The characters considered were root length, root volume, shoot length, root fresh weight, shoot fresh weight, leaf fresh weight, root dry weight, shoot dry weight, leaf dry weight, and tolerance index which showed significant differences among genotypes under different water regimes for stress tolerance. On the basis of seedling characters OEX 29 was found to be consistent by highly tolerant to moisture stress after evaluation in laboratory, field and pot culture. Genotypes OIJ 177 and OIN 791 showed tolerance, whereas, JRO 524 followed by JRO 632, JRO3690, JRO 8432, OIJ214 and OIN 970 were found to be the most susceptible genotypes.

Assessment of genetic diversity in Jute (Corchorus olitorius L.) under rain fed condition

Jute fibre is obtained from the bark of the two commercially important species namely Corchorus capsularis L. and Corchorus olitorius L. 20 genotypes of white jute were sown in Randomized Block Design with three replications classified by Mahalanobis D 2 statistics under rainfed condition to identify desirable genotypes for use in breeding programme to develop drought tolerant hybrids. Maximum inter cluster distance was observed between cluster III and II while cluster III showed the maximum intra cluster distance. Green weight was found to be the maximum contributor (21.58%) towards divergence followed by dry stick weight (20%), top diameter (15.79%) and fibre yield (14.74%). Cluster V was found to be most important group for a number of characters like green weight, bark thickness, basal diameter as well as mid diameter, plant height and internode length. Therefore, for improvement of the crop the genotypes from clusters V, IV and II may be considered to obtain high fibre yielding lines with characteristic features like earliness and plant with least number of nodes under rainfed condition. Key words: Tossa jute, fibre, rainfed, divergence, olitorius.

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.