Year 2018

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Subject: search.filters.subject.Zea mays L.

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    GENETIC VARIABILITY AND CHARACTER ASSOCIATION OF YIELD COMPONENTS IN MAIZE
    (DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) KHAN, MST. SUMAYEA
    The research investigation was carried out in the experimental area of Sher-eBangla Agricultural university, Sher-e-Bangla Nagar, Dhaka-1207, during the late Rabi season Mid December to May 2018 to study the genetic variability and character association of yield components in Maize with35 maize genotypes as experimental materials that was laid out in Randomized Complete Block Design
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    GENETIC DIVERSITY, CORRELATION AND PATH CO-EFFICIENT ANALYSIS OF WHITE MAIZE (Zea mays L.)
    (DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) ROY, GOUTOM
    Seventeen white maize inbreed lines were collected from CIMMYT, Mexico and Bangladesh and laid out in Randomized Complete Block Design (RCBD) with three replications in the experimental farm of Sher-e-Bangla Agricultural University, Dhaka during October, 2016 to April, 2017. Mean performance, variability, correlation matrix and path analysis on different yield contributing characters and yield of maize inbreed line were calculated. The mean performance of the maize inbreed lines showed that the maximum grain yield/plant (170.01 g) was recorded in the genotype of CLTHW15008, whereas the minimum grain yield/plant (44.52 g) was recorded in CLTHW15007. The phenotypic co-efficient of variation was higher than the genotypic co-efficient of variation for all the yield contributing traits. In correlation study, significant positive association was recorded for grain yield/plant with base diameter of plant (1.00), leaf breadth (1.00), cob length (0.979), cob diameter (0.930), number of row per cob (0.979), number of grain per row (0.999), 100-grain weight (0.992). Path analysis revealed that plant height (0.412), leaf breadth (0.073), days to 50% flowering (0.280), number of rows per cob (0.462), number of grain per row (0.209) had positive direct effect on yield/plant. Base to cob distance (-0.214), base diameter (-0.614), leaf length (-0.467), days to maturity (-0.262), cob length (-0.725), cob diameter (-0.355), 100-grain weight (-0.472) had negative direct effect on grain yield. In diversity analysis the clustering pattern denoted that, cluster II was the largest cluster comprising of 6 genotypes and cluster III belonged to 4 genotypes of maize. The maximum inter-cluster divergence was observed between cluster I and V (58.22) followed by cluster I and III (48.35). Considering diversity pattern, genetic variability and other agronomic performance CLTHW15008 from cluster I; CLTHW15004, CLTHW15005, CLTHW15006, CLTHW15015 from cluster II might be considered as potential parents for hybridization program for further improvement of the crop.
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    GENETIC VARIABILITY, CHARACTER ASSOCIATION AND PATH ANALYSIS IN F 3 SHORT STATURE POPULATIONS OF WHITE MAIZE (Zea mays L.)
    (DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA-1207, 2018-06) SHOMPA, BODRUN NESSA
    The investigation was carried out with 24 F 3 white maize populations to study the genetic variability, character association and finally to select the short duration and dwarf promising populations based on yield and yield contributing traits at Sher-e-Bangla Agricultural University, Dhaka during November 2017 to March 2018. Significant variations were observed among the F 3 populations for all the traits studied. The F 3 population of KS-510-F 3 -S 2 showed the maximum mean performance in plant height (220.61 cm), cob length (19.65 cm), number of grains per row (33.83), while the population of Youngnuo-7F 3 -S 1 showed the minimum mean performance in plant height (122.33 cm), cob height (53.00 cm), base diameter (6.10 cm). The population PSC-121-F 3- showed the maximum yield per plant (97.67), while Youngnuo-7-F 3 showed the minimum yield per plant (46.94). In analysis of different genetic parameters the highest genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) values were observed for cob height (20.99, 21.55), leaf blade area (19.20, 20.31), yield per plant (19.04, 22.59). High heritability coupled with high genetic advances in percent mean were obtained for plant height, cob height, number of cob bearing node, leaf blade area, number of grains per row and yield per plant. Correlation studies revealed that yield per plant positively and significantly associated with plant height, base diameter, number of leaves per plant, cob length, cob diameter and number of grains per row at both genotypic and phenotypic levels. Path coefficient analysis indicated positive direct contribution towards yield per plant through plant height, base diameter, branches of tassel, leaf blade area, cob length, cob diameter, number of rows per cob, number of grains per row and 100 grain weight. Based upon the mean performance among the 24 F 3 -S 1 segregating population, PSC-121-F 3 and KS-510-F 3 -S 1 would be selected for high grain yield per plant. Again Youngnuo-7-F 3 -S 2 and Changnuo-1-F 3 -S 1 might be selected as promising for both of the traits short duration and dwarf plant stature. S 2 -S 2