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Inheritance of Yield Related Traits in a Half Diallel Crosses of Some Maize (zea Mays L.) Genotypes

FMA Haydar
Department of Botany, University of Rajshahi, Rajshahi, Bangladesh

Abstract/ Executive Summary:

Inheritance of grain yield, heterosis and combining ability were investigated in maize populations obtained from half-diallel crossing among six inbred parental lines. General (GCA) and specific (SCA) combining ability effects were significantly different among parental lines. The grain yield was under the partial gene effect. The parents P_1, P₃ and P₅were considered suitable according to their yield contributing attributes couple with general combining ability effects. The midparent heterosis values ranged from -27.246 (P₂ xP₅) to 15.209% (P₁ xP₂) whereas the better parent heterosis values varied between 22.375 (P₂x P₃) to 40.363% (P₂ x P₅) only seven crosses had higher grain yields. Of those crosses, P₁×P₂, P₂×P₅ and P₁×P₃ were considered most promising hybrids yielding heterosis as 15.880%, 20.363% and 40.363 respectively over their parents.

Keywords: Maize, Diallel analysis, Combining ability, Heterotic effect

Location: Biometrical Genetics Lab. Department of Botany, University of Rajshahi, Bangladesh

Start Date: 00-00-2018

End Date: 00-00-2019

Program Area: Variety and Species

Commodity: Maize

Objectives:

The objectives of this study were to estimate the genetic parameters and heterotic effects as well as to determine suitable parents and promising crosses for grain yield in a 6 × 6 half-diallel maize population.

Methodology:

Six inbred lines, P₁, P₂, P₃, P₄, P₅ and P₆ obtained from the Biometrical Genetics Lab. Department of Botany, University of Rajshahi, Bangladesh were crossed in a 6x6 half-diallel mating scheme in the 2018 growing season. The parents, their 15 F₁ populations and a commercial hybrid, 21 entries in total, were grown at the Botanical Research Field, Rajshahi University, in the 20 December 2019 growing season. The plots were represented by 4 rows; 5 m long and spaced 0.7 m apart with 25 plants per row after thinning. The soil of the experimental site was clay loam in texture. The experiment design was a randomized complete block design (RCBD) with 3 replications. Cultural practices were consistent with the production of maize at this location. Grain yields of each genotype were obtained from each row of the plots and were corrected according to 15% of kernel moisture. Data were collected on number of grains/cob and grain yield/plant. Data obtained from the 15 F₁ progeny and 6 parents were analyzed by Jinks-Hayman type diallel analysis for genetic parameters (Jinks and Hayman, 1953). The methods were calculated by Mather and Jinks (1971) and using the software of GANTAT.

Source of Information: The Agriculturists 2020; 18(1) 18-25

Article Link (Online Journal): DOI: https://doi.org/10.3329/agric.v18i1.49455

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The of both additive and non-additive gene effects for number of grains/cob and grain yield/plant suggested that reciprocal recurrent selection would be an effective approach for improving those traits.

Knowledge Management: Journal