Abstract
The genetic parameters, characters association and path coefficient analysis between yield and yield components of 32 exotic and local hybrid maize genotypes were studied at Plant Breeding division, Regional Agricultural Research Station (RARS), Bangladesh Agricultural Research Institute (BARI), Rahmatpur, Barisahl during rabi 2015 to 2016, following Alpha Lattice Design with three replications. All the characters showed significant differences among the genotypes except cob length indicating their wide genetic variation. The highest genotypic co-efficient of variation (11.48) observed in yield and lowest (1.72) was found in days to maturity. All of the characters exhibited moderate to high heritability in broad sense (h2b) coupled with a wide range of genetic advance and genetic advance in percentage of mean. Heritability ranged from 19.21 to 86.79 for cob length and thousand seed weight, respectively. Yield had a significant positive correlation with cob length, cob diameter, number of seeds per cob and number of rows per cob. Days to tasseling and number of seeds per cob make highest positive contribution toward yield. While, days to silking and ear height had highest negative direct effect on yield. The results indicated that ear height, number of rows per cob, thousand seeds weight and number of seeds per cob could be considered as selection criteria in maize breeding program.
 Asian J. Med. Biol. Res. March 2020, 6(1): 8-15
Highlights
Maize is the third most important cereal crop after rice and wheat contributing to agricultural economy of Bangladesh in various ways
The phenotypic co-efficient of variation (PCV) were higher than their corresponding genotypic co-efficient of variation (GCV) for all the characters studied indicating that they all interacted with the environment to some intent
Plant and ear heights are strongly associated with grain yield (Martin and Russell, 1984; Burak and Magoja, 1991; Singh and Dash, 2000; Umakanth et al, 2000), but Rather et al (1999) reported the association of plant height with grain yield as non-significant
Summary
Maize is the third most important cereal crop after rice and wheat contributing to agricultural economy of Bangladesh in various ways. Maize is gaining importance in recent years as a promising crop aimed in boosting agricultural growth in Bangladesh. The acreage and production of maize in the country is increasing but not encouraging enough compared to the world perspective, and the demand of the crop in the country is increasing at a higher rate. Yield of maize like rest crops is the final product attributed by a complex chain of interrelating effects of different characters (Singh et al, 2005). Determination of correlation and path coefficients between yield and yield traits is important for the selection of favorable plant types for effective maize breeding programs. It is not sufficient to describe their relationship when the causal association
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