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Evaluation of Inbred Lines of Maize Through Line ×tester Method

Nasrin Jahan
Scientific Officer
Scientific Officer, Plant Breeding Division, RARS, Rahmatpur, Barishal

Dr. Md. Saleh Uddin
Principal Scientific Officer
RARS, Rahmatpur, Barishal

Abstract/ Executive Summary:

Early generation evaluation of maize inbred lines through line ´ tester method was conducted at Regional Agricultural Research Institute, Rahmatpur during rabi 2013-14 in maize involving 12 S₄ lines and 2 testers for grain yield, yield components and other characters to estimate the general combining ability of the lines and specific combining ability effects of the crosses. Highly significant genotypic differences were observed indicating wide range of variability present among them. The crosses with high SCA effect for grain yield evolved from high × low general combiner parents were reveled additive x dominance type of gene action. The cross combinations E-7 X BIL-29, E-11 X BIL-29, E-10 X BIL-28 and E-9 X BIL-28 with high positive SCA effect having high mean values might be used for obtaining high yielding hybrids.

Keywords: Evaluation, Maize inbreds, Line × Tester method

Location: RARS, Rahmatpur, Barishal

Start Date: 00-00-2012

End Date: 00-00-2012

Program Area: Variety and Species

Commodity: Maize

Objectives:

To determine the gca and sca of the crosses for different traits and to explore heterotic hybrid combinations.

Methodology:

Twelve S₄ generation inbred lines (as female parents) and 2 testers (as male parents) of maize were selected and crossed in a line ´ tester fashion to generate 24 cross combinations in rabi 2012 at Regional Agricultural Reserach Institute, Rahmatpur. In the following rabi, 2013, seeds of all the parental lines, their F₁ hybrids and two testers were sown at Regional Agricultural Reserach Institute, Rahmatpur following alpha lattice design with 3 replications. The unit plot size was 4.0 ´ 0.75 m. Spacing adopted was 75 ´ 25 cm between rows and hills, respectively. Intercultural operation and fertilizer were applied as recommend doses. Ten randomly selected plants were used for recording observations on days to tasseling, days to silking, plant height (cm), ear height (cm), days to tasseling, days to silking and grain yield (ton/ha) were recorded on whole plot basis. Combining ability analysis was done by statistical software R.

Source of Information: Annual Research Report 2013-14, Plant Breeding Division, BARI, page: 53-58

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Twenty thousand taka only

Total Budget (Tk.) : Twenty thousand taka only

Achievement/Findings:

The analysis of variance showed significant variation among the genotypes for all the studied character. Significant differences were observed in the variance due to lines, testers, hybrids and Line x Testers for all the traits. Significant differences were also observed among the hybrids for all the characters except days to tasseling, silking and number of kernel per row. Significant differences were observed between the lines for number of kernel per row. The proportional contribution of lines and interactions to the total variances was much higher than testers in all the traits.General combining ability (GCA) effects of parents indicated that line E-3 and E-6 exhibited highly negative GCA effects for both days to tasseling and silking which could be utilized for evolving early variety. The GCA effects of parents indicated that the lines E-8 contributed highly significant negative effects for evolving shorter plant height while E-6 showed significant positive effects. The GCA effects of parents indicated that E-1and E-9 contributed highly significant negative effects for ear height. The lines E-2, E-3, and E-6 exhibited positive GCA effect for ear length.With respect to days to tasseling and silking, crosses E-9 X BIL-29 showed the best specific combining ability (SCA) effects for earliness, whereas E-9 X BIL-28 showed lowest SCA effect. Cross E-9 X BIL-28 and E-11 X BIL-29 were good specific combiners. The inbred parents E-3, E-6, E-8, and E-9 have been identified as the best general combiner due to their good combining ability effects and also their ability to transmit characters to their progenies for most of the characters. The cross E-7 X BIL-29, E-11 X BIL-29, E-10 X BIL-28 and E-9 X BIL-28 were identified as the best combinations for yield due to their SCA effects along with high mean performance for yield traits.

Knowledge Management: Report/Proceedings