EVALUATION OF INBRED LINES TO SELECT DESIRABLE PARENTS FOR HYBRIDIZATION IN MAIZE

Abstract

An 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 2011 to March 2012 to evaluation of inbred lines for selecting desirable parents for hybridization in maize. 30 in bread lines of maize were used. The experiment was laid out in the Randomized Complete Block Design (RCBD) with three replications. The layout of the experiment was prepared for distributing the in bread lines into the every plot of each block. There were 90 plots, each measuring 4.0 m * 4.0 m. Among the different maize inbred lines days to tasseling was significantly influenced by different inbred lines ranges from 91 to 79 days. The maximum days need to be tasseling 91.0 days in T29 inbred line and the minimum days to tasseling 78.33 was required for T3 inbred line. The cob length was showed significantly varied from each other inbred lines ranges from 46.23 to 68 cm and the lowest cob length (46.23 cm) was recorded from T>, inbred line. The tallest ear length (19.35 cm) was recorded from T25 inbred line and the shortest ear length (13.23 cm) was observed from T>; inbred line. Significantly, the maximum yield/plant (427.5 g) was found from Ts inbred line. The minimum yield/plant (150.0) was recorded from T,s inbred line. Due to the consideration of yield/plant in respect of phenotypic variation (3090.42) was higher than the genotypic variance (3062.59) for indicating high environmental persuade on this characters which was supported by narrow difference between phenotypic (19.0%) and genotypic (18.92%) co-efficient of variation. High heritability (99.09%) for yield/plant attached with lowest genetic advance (145.43%) and highest genetic advance in percentage of mean (49.72). The average inter cluster were always higher than the average intra cluster distance (Table 6) that suggesting wider genetic diversity among the inbred lines of the groups. Cluster I had the highest intra-cluster distance (2.261) followed by cluster VI (0.754). Cluster II had the lowest intra cluster distance (0.0565) followed by cluster II (0.421). Cluster VI had highest intra-cluster distance and inter-cluster distance was maximum between cluster I and VI. So the inbred lines chosen from these clusters would give broad spectrum of variability in segregating generation. The difference between the corresponding phenotypic and genotypic coefficient of variation was narrow for all the characters studied. The high heritability coupled with genetic advance were observed in no. of grains per cob, 1000 grains weight and grain yield per plant. These characters were under the control of additive gene effect and selection for genetic improvement from these might be effective. Correlation studies showed positive and significant correlation between grain yield per plant and its most components.