| dc.description | Maize (Zea mays L.) is one of the most important photo-insensitive, cross
pollinated cereal crops belongs to the family Gramineae. It is one of the
productive C4 plant with a high rate of photosynthetic activity and has the highest
potential for carbohydrate production per unit area per day. Its grain can be used
for human consumption in various ways such as corn meal, fried grain and flour.
This crop has much higher grain protein content than our staple food rice. Its grain
has high nutritive values containing 66.2% starch, 11.1% protein, 7.12% oil and
1.5% minerals. Moreover, 100 g maize grains contain 90 mg carotene, 1.8 mg
niacin, 0.8 mg thiamin and 0.1 mg riboflavin (Chowdhury and Islam, 1993).
Maize oil is used as the best quality edible oil. | en_US |
| dc.description.abstract | The field experiment was conducted in the experimental field of Department of
Genetics and Plant Breeding, Hajee Mohammad Danesh Science and Technology
University, Dinajpur, Bangladesh, during the period from October 2009 to March
2010 to study the genetic variability and diversity in hybrid maize. In this research
work, the seeds of 10 maize genotypes were used viz. G,: Durga, G:: CML-492, G;:
CML-503, Gy: Kanak, Gs: BHM-5, Ge: BHM-3, G7: NK-40, Gg: Bijoy, Go: Seed tee740 and Gio: NT-6323. The experiment was laid out in the Randomized Complete
Block Design (RCBD) with three replications. Mean performance, variability,
correlation coefficient, path analysis and divergence analysis were done on yield and
yield contributing characters namely, days to male flowering, days to female
flowering, days to maturity, plant height, tassel length, cob length, cob diameter,
distance between tassel and cob, number of grains per cob, weight of 1000 grains and
grain yield per plant. The highest grain yield per plant (211.18 g) was recorded from
Gg (Seed tee-740) again, the lowest (135.26 g) was found from G3; (CML-503). Grain
yield per plant in terms of phenotypic variation (835.21) was higher than the
genotypic variance (575.71) which was supported by narrow difference between
phenotypic (16.09%) and genotypic (13.36%) co-efficient of variation. Very high
heritability (68.93%) for grain yield per plant attached with high genetic advance
(52.59%) and low genetic advance in percentage of mean (29.28). Grain yield per
plant of maize genotypes showed positive significant association with days to male
flowering (0.589), days to female flowering (0.574), plant height (0.508), tassel length
(0.673), cob length (0.703), cob diameter (0.510), distance between tassel and cob
(0.400), number of grains per cob (0.506) and weight of 1000 grains (0.558) grain
yield per plant in maize genotypes whereas insignificant positive association was
recorded with days to maturity (0.289). All the genotypes were grouped in 4 clusters.
Cluster II was the largest cluster comprising of 4 maize genotypes followed by cluster
IV with 3 genotypes and cluster III comprises only 1 maize genotype. Cluster
distances denoted by the average inter and intra-cluster distances are the approximate
measure of the cluster divergence. Cluster IV had the highest intra-cluster distance
(0.806) followed by cluster IIT (0.706). Cluster I had the lowest intra cluster distance
(0.339) followed by cluster II (0.421). Inter cluster distance was maximum (7.665)
between clusters III and IV, followed by clusters II and IV (6.195). | en_US |
