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Combining Ability in Maize

N. A. Ivy
Scientific Officer
Plant Breeding Division, BARI, Joydebpur, Gazipur.

M. S. H. Hawlader
Principal Scientific Officer
BRRI, Regional Office, Bhanga, Faridpur.

Abstract/ Executive Summary:

Combining ability analysis was carried out in a 6X6 maize diallel for kernel yield and other 11 important agronomic characters. Results revealed that the variances due to GCA were highly significant for all the characters studied indicating the importance of both additive and non-additive gene effects. The parent Ki 32 was an excellent general combiner for earliness. SCA estimates indicated that the crosses "Ki 32 x CML 0", "Ki 32 x CML 327" and "Ki 42 x CML 327" were promising for exploiting the yield potential in maize.

Keywords: Combining Ability, Seeds, Maize

Location: Bangladesh Agricultural Research Institute, Joydebpur, Gazipur

Start Date: 00-00-1995

End Date: 00-00-1997

Program Area: Variety and Species

Commodity: Maize

Objectives:

1. To identify superior inbreds and also to increase the productivity.

2. To identify superior inbreds and cross combinations from a 6 x 6 diallel in maize to develop desirable high yielding hybrid or synthetic varieties.

Methodology:

The seeds of three inbred parents viz., Ki 31, Ki 32 were collected from the Kasetsart University, Thailand and the remaining three inbred parents viz. CML 0, CML329 and CML327 were collected from CJMMYT (Mexico). The inbreds were crossed in all possible combinations (excluding reciprocals) in the rabi season of 1995-96 to produce 15 F₁s. In 1996-97, 15 F₁s along with six parents were planted in a Randomized Complete Block Design with 3 replications at the Bangladesh Agricultural Research Institute, Joydebpur, Gazipur. Each plot consisted of a single row of 5m long. The rows were spaced at 75 cm in which plant to plant distance within the row was 25 cm. Recommended fertilizer dose and management practices were applied. Data were recorded from ten randomly selected plants for plant height, ear height, days to teasle, days to silk, days to mature, yield per plant, leaves per plant, ear length, ear diameter, kernel rows per ear, kernel per row and 1000-kernel weight. The data obtained were analyzed for combining ability following Model I and Method II of Griffing.

Source of Information: Bangladesh J. Agril. Res. 25(3) : 385-392, September 2000

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The analysis of variance revealed highly significant variations among the genotypes under study for all the characters. The mean sum of squares due to general and specific combining ability were highly significant for almost all the characters indicating both the additive and non-additive gene actions played a predominant role for the expression of these characters. Results revealed that the variances due to GCA were highly significant for all the characters studied indicating the importance of both additive and non-additive gene effects. The parent Ki 32 was an excellent general combiner for earliness. SCA estimates indicated that the crosses "Ki 32 x CML 0", "Ki 32 x CML 327" and "Ki 42 x CML 327" were promising for exploiting the yield potential in maize.

Knowledge Management: Journal