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Genetic Diversity in Maize (zea Mays L.) Inbred Lines

M. A. K. Azad
Dept. of Genetics & Plant Breeding, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

B. K. Biswas
Dept. of Genetics & Plant Breeding, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

N. Alam
Dept. of Botany, Jahangirnagar University, Savar, Dhaka, Bangladesh

Sk. S. Alam
Dept. of Botany, University of Dhaka, Bangladesh

Abstract/ Executive Summary:

Thirty yellow inbred lines of normal maize were evaluated for thirteen parameters at the experimental field of Hajee Mohammad Danesh Science and Technology University during 2010-11 to study the genetic divergence using multivariate analysis. The thirty inbreds fell into six distinct clusters. The intra-cluster distances in all the six clusters were more or less low, indicating that the genotypes within the same cluster were closely related. The highest inter-cluster distance was observed between cluster I and cluster IV and the lowest between the cluster II and III. The cluster V and cluster IV contained the highest (9) and lowest (1) number of genotypes, respectively. Cluster VI showed the highest mean values for kernel yield and all the yield contributing traits except days to 50% tasseling and 50% silking. Cluster II had the lowest mean values for ear height and ear length. Days to maturity and ear diameter showed maximum contribution towards total divergence among different characters. Based on medium to high inter-cluster distances, six inbred lines viz. ML06, ML10, ML14, MK19, ML25 and ML26 were selected for hybrid program. Development of hybrids utilizing these genotypes has the chance to obtain higher heterosis with high performing crosses.

Keywords: Genetic diversity, Cluster analysis, Inbred lines, Zea mays L.

Location: Experimental field, Hajee Mohammad Danesh Science and Technology University, Dinajpur

Start Date: 00-12-2010

End Date: 00-05-2011

Program Area: Variety and Species

Commodity: Maize

Objectives:

To estimate the nature and magnitude of genetic diversity in 30 maize inbred lines.

Methodology:

The study was conducted during December 2010 to May 2011 at the experimental field of the Dept. of Genetics and Plant Breeding, Hajee Mohammad Danesh Science and Technology University, Dinajpur. This study was a part of a long-term maize inbred line development program conducted at the University mentioned above where nearhomozygous inbred lines were developed from ten single cross hybrid varieties as source population. The inbred lines were ML-01 to ML- 30. Thirty maize inbred lines were grown in a alpha lattice design with three replications during rabi season of 2010-2011. The seeds of each entry were sown on 21 December 2010 in 5 m long one row with spacing of 0.75 x 0.20 m between rows and hills, respectively. One plant was kept per hill after proper thinning. Recommended doses of fertilizers were applied. The other intercultural operations were done timely and properly to raise the crop uniformly. Observations were recorded on whole plot basis for days to 50% tasseling (DT), 50% silking (DS) and maturity (DM). Ten randomly selected plants were used for recording observations on plant height (PH), ear height (EH), ear length (EL), ear diameter (ED), ears/plant (EPP), number of kernel rows/ear (KRPE), number of grains/row (GPR), number grains/ear (GPE), 1000-kernel weight (g) (TGW) and kernel yield/plant (g) (YPP). Data were subjected to principal component and Mahalanobis (1936) D2 analysis extended by Rao (1952) using GENSTAT 5 Computer programme.

Source of Information: The Agriculturists 10(1): 64-70(2012) ISSN-1729-5211, A Scientific Journal of Krishi Foundation

Article Link (Online Journal): http://banglajol.info/index.php/AGRIC/article/view/11066/8093

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Genetic diversity was studied to find out the more diverse inbred lines in maize which might be used in hybridization programme. Thirty maize inbred lines were grouped into six different clusters. The crosses involving parents/inbred lines from most divergent clusters are expected to manifest maximum heterosis and generate wide variability in genetic architecture.

Knowledge Management: Journal