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Evaluation of Advanced Lines of Maize Through Line × Tester Method

S. R. Dey
Scientific Officer
Scientific Officer, RARS, Hathazari, Chittagong

Dr. Mohammad Amin
Chief Scientific Officer
RARS, Hathazari, Chittagong

M. Sultan Mia
Scientific Officer
Scientific Officer, RARS, Hathazari, Chittagong

Shahnewaz Begum
Scientific Officer
Scientific Officer, Plant Breeding Division, BARI, Gazipur

Abstract/ Executive Summary:

Evaluation of S₄ lines of NK46 by using line × tester method was conducted in maize involving 18 lines and 2 testers for grain yield and its components to determine the general combining ability (GCA) and specific combining ability (SCA) effects. Highly significant genotypic differences were observed indicated wide range of variability present among the genotypes. Non-additive gene action was predominant. Four lines for days to tasseling, one for days to silking, two for plant height, one for ear height, three for 1000 kernel weight, and four lines for yield were found with significant GCA effects in desired direction. For days to tasseling, days to silking, plant height and ear height none of 36 cross combinations showed significant SCA effects. For yield two crosses showed significant positive SCA. Finally five lines namely, NK46 S4-2, NK46 S4-13, NK46 S4-18, NK46 S4-43 and NK46 S4-44 were selected.

Keywords: Evaluation, Advanced maize lines, Line × Tester method

Location: RARS, Hathazari, Chittagong

Start Date: 00-00-2012

End Date: 00-00-2013

Program Area: Variety and Species

Commodity: Maize

Objectives:

To determine the general combining ability (GCA) and specific combining ability (SCA) of developed crosses for different traits and to explore the superior lines and heterotic hybrid combinations.

Methodology:

During rabi, 2012-13, a total of 36 cross combinations were made through Line × Tester mating design. The 36 F₁’s, 18 S₄ parental lines and two testers (IBIK28 and BIL795) were grown in a alpha lattice design with two replications with spacing of 75 cm x 20 cm at RARS, Hathazari, Chittagong during rabi, 2013-14. Seeds were sown in 29 November, 2013. Intercultural operation and fertilizer were applied as recommend dose. The observations were recorded on ten randomly selected plants for quantitative characters viz. days to 50% tasselling, days to 50% silking, plant height, ear length, 1000 grain weight, and grain yield. Combining ability analysis was done

Source of Information: Research Report 2013-14, Plant Breeding Division, BARI, page: 58-64

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Ten thousand taka only

Total Budget (Tk.) : Ten thousand taka only

Achievement/Findings:

Five lines namely, NK46 S4-2, NK46 S4-13, NK46 S4-18, NK46 S4-43 and NK46 S4-44 were selected for further research.

Knowledge Management: Report/Proceedings