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Evaluation of Inbred Lines of Pop Corn Through Line × Tester Method (set-vi)

S.H. OMY
Plant Breeding Division, BARI

M. AMIRUZZAMAN
Plant Breeding Division, BARI

M.G. HOSSAIN
Plant Breeding Division, BARI

Abstract/ Executive Summary:

A Line × Tester analysis was conducted in popcorn involving 8 selected S₃lines and 3 testers for grain yield, its components and popping quality 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. The inbred parents Thai Pop/S_3-28 and Thai Pop/S_3-20 were identified as the best general combiners due to their good combining ability effect for grain yield and popping quality and also their ability to transmit characters to their progenies for most of the characters. The crosses with high SCA effect for grain yield evolved from high × low general combiner parents were revealed additive × dominance type of gene action. The good crosses viz. Thai Pop/S₃-17 × PCB/S₆-39 and Thai Pop/S₃-20 × PCB/S₆-39 could be used in future breeding program to develop high yielding popcorn hybrids with desirable qualities. The information on the nature of gene action with respective variety and characters might be used depending on the breeding objectives.

Keywords: Line × Tester, General combining ability, Specific combining ability, Pop corn, Inbred

Location: Joydebpur

Start Date: 00-00-2014

End Date: 00-00-2015

Program Area: Variety and Species

Commodity: Maize

Objectives:

The present study involving a Line × Tester analysis aimed to determine the general combining ability (GCA) and specific combining ability (SCA) of parents and crosses for different traits and to explore heterotic hybrid combinations for developing high yielding pop corn

Methodology:

The experimental materials comprised of eight selected S₃ generation lines of Thai pop corn (as female parents) and three testers (PCB/S6-11, PCB/S6-13, PCB/S6-39) of popcorn. Total 24 crosses combinations were made through Line × Tester mating design during 2013-14. The 24 F₁’s along with two checks (NI5820 and Khoibhutta) were sown following Alpha lattice design with two replications at the research field of Bangladesh Agricultural Research Institute, Joydebpur during rabi, 2014-15. Spacing was maintained at 60 cm × 20 cm. Two border rows were used at each end of the replication to minimize the border effect. Fertilizer were applied @ 250, 55, 110, 40, 5 and 1.5 Kg/ha of N, P, K, S, Zn and B, respectively. All the recommended packages of practice were followed and the observations were recorded on ten randomly selected plants for quantitative characters viz. days to 50% tasselling, days to 50% pollen shading, days to 50% silking, plant and ear height, ear length, ear diameter, number of grains per ear, 1000-grain weight, and grain yield. Yield maturity traits were recorded from plot basis and yield was converted to ton/ha. After harvesting and proper drying, the popcorns were tested for quality by popping. Qualitative characters like popping % and popping expansion was recorded. After popping the popped kernels were tasted by 17 evaluators (Scientists and staffs) for scoring the taste of quality following 1-5 scale. During scoring the best one was scored 1 and the worst one was scored 5. All these observations were considered in combining ability analysis (excluding parents) following as per the method given by Sharma (1988).

Source of Information: Annual Research Report, Plant Breeding Division, BARI--2014-15

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The analysis of variance revealed significant differences among the parents, crosses and parents vs. crosses for popping quality and most of the the traits studied, indicating sufficient genetic variability present among them. The analysis of variance also revealed significant differences in the variance due to testers, and Line x Testers in some of the yield and quality traits. No significant differences were observed among the lines but significant difference was observed for the testers regarding tasseling, pollen shedding, silking, plant height and ear height. Significant differences were also exist in the interactions of Line × Testers for some of the yield, yield related traits and popping quality traits, indicating that there were wide range of variability among lines and testers for the traits. The higher estimate of dominance variance as compared to additive variance for all of the characters probably due to predominance of non-additive gene action, which suggesting the scope of improvement of these characters through heterosis breeding. The proportional contribution of lines and interactions to total variances was much higher than testers in all the traits except days to tassel, days to pollen shading, days to silking, plant height and ear height. However, the contribution of lines was higher than the interactions to total variances only for test quality and was nearly equal in case of popping expansion. In this study interaction contributed maximum to total variance for quality traits and grain yield which was followed by female lines.

The parental line Thai Pop/S_3-28 and Thai Pop/S_3-20 has 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 crosses Thai Pop/S₃-17 × PCB/S₆-39 and Thai Pop/S₃-20 × PCB/S₆-39 were marked out as good combinations for yield and quality trait along with high mean performances, could be used in future breeding program to develop high yielding popcorn hybrids with desirable qualities including poping..

Knowledge Management: Report/Proceedings