Papers by Umakanta SARKER
The study was conducted to investigate the genetic diversity of some maize inbreds under salinity... more The study was conducted to investigate the genetic diversity of some maize inbreds under salinity stress condition using Mahalanobis’s statistic (D2) and principal component analysis. Analysis of variance showed significant difference for all the characters. Results of multivariate analysis revealed that seventeen inbred lines formed five clusters at 12 dS level of salinity. The highest intra-cluster distance was recorded in cluster IV containing three genotypes and the lowest was in cluster V having one genotype. The inter cluster D2 values revealed maximum distance among the clusters. The highest inter cluster distance was observed between clusters IV & III and lowest was between V & I. Cluster IV had the highest cluster means for cob height, tassel length, cob length, SPAD value, number of seeds/cob, 100 seed weight, cob diameter and grain yield per plant. Considering cluster distance, inter-genotypic distance, cluster mean and other agronomic performances the genotypes CZ29, CZ3...
Bangladesh Journal of Plant Breeding and Genetics, 2011
ABSTRACT Abstract An experiment was conducted to study the heterosis of 27 F1 hybrids produced fr... more ABSTRACT Abstract An experiment was conducted to study the heterosis of 27 F1 hybrids produced from nine CMS lines and three restorer lines of rice with their parental lines and BRRI Dhan29 as standard check for 17 yield and its contributing traits. Mid parent, better parent and standard heterosis of most of the crosses were significant for most of the characters studied either in positive or in negative direction. Desirable and significant mid parent and better parent heterosis was observed in 13 and seven cross combinations, respectively for grain yield and most of its related traits. Considering more than 20% mid parent and better parent heterosis for grain yield along with most of its related traits, nine and five cross combinations, respectively were identified as good heterotic combinations over mid parental and better parental value. On the basis of individual trait significant and desirable mid parent heterosis was observed in eight cross combinations for plant height, 12 for leaf blade length, nine for flag leaf blade length, 13 for flag leaf sheath length, eight for tillers per hill, eight for panicles per hill, 14 for days to 50% flowering, four for days to maturity, four for panicle length, 14 for panicle weight, nine for primary branches per panicle, 16 for secondary branches per panicle, six for filled grains per panicle, 15 for 1000 seed weight, 13 for grain yield per hill and 15 for harvest index. Significant and desirable better parent heterosis was observed in 12 cross combinations for plant height, 11 for leaf blade length, 5 for flag leaf blade length, nine for flag leaf sheath length, seven for tillers per hill, seven for panicles per hill, 25 for days to 50% flowering, one for days to 100% flowering, seven for days to maturity, three for panicle length, nine for panicle weight, five for primary branches per panicle, 12 for secondary branches per panicle, four for filled grains per panicle, nine for 1000 seed weight, seven for grain yield per hill and nine for harvest index. None of the crosses were identified as good heterotic over standard check for grain yield per hill but many good and desirable heterotic crosses were identified over standard check for most of the yield related characters. Twenty cross combinations were identified as heterotic over standard check due to desirable and significant standard heterosis for most of the yield related traits. Keywords: Heterosis; rice; Oryza sativa; boro
Twenty five vegetable amaranth genotypes were evaluated to investigate the antioxidant vitamins a... more Twenty five vegetable amaranth genotypes were evaluated to investigate the antioxidant vitamins and minerals composition and its genetic variability in a RCBD with three replications at Bangabandhu Sheikh Mujibur Rahman Agricultural University in Bangladesh during kharif1 season 2012 and 2013, respectively. Significant Mean Sum of Square revealed a wide range of genotypic variability among traits. Vegetable amaranth was rich in iron, zinc, manganese, magnesium and potassium. Ten strains gave the best (more than 5 kg) foliage yield with rich in antioxidant minerals and vitamins. Selection of these genotypes would be economically useful for antioxidant vitamins, minerals and yield aspects. On the other hand, eight genotypes had high amounts of antioxidant vitamins and minerals with below average foliage yield and could be utilized as donor parents for introgression of genes in vitamins and minerals deficient lines. Considering genetic parameter six traits i e., Fe, Zn, Mn, ascorbic acid, number of leaves plant and foliage yield would be selected for the improvement of vegetable amaranth genotypes under study. However, correlation study revealed that selection based on Fe, Mn, ascorbic acid and number of leaves per plant could lead to increase the foliage yield of vegetable amaranth strains. Insignificant genotypic correlations between foliage yield with most of the antioxidant vitamins and minerals traits indicating that selection for high vitamins and minerals content might be possible without compromising yield loss. Based on mean, genetic parameters and correlation coefficient values, five vegetable amaranth genotypes i. e., AA19, AA10, AA3, AA24 and AA7 might be selected as high vitamin and minerals containing high yielding vegetable amaranth varieties.
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Papers by Umakanta SARKER