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Evaluation of Inbred Lines of Baby Corn Through Line × Tester Method (set V)

A. AHMED
Plant Breeding Division, BARI

M. AMIRUZZAMAN
Plant Breeding Division, BARI

S. BEGUM
Plant Breeding Division, BARI

S.H. OMY
Plant Breeding Division, BARI

Abstract/ Executive Summary:

Seven S₄lines of baby corn were crossed with 3 testers in a Line × Tester (L × T) mating design and the resulting 21 crosses along with parents and standard checks Baby star were evaluated to develop high yielding baby corn hybrids during rabi, 2014-15. Variance due to sca was larger than gca variance for all the characters indicating the preponderance of non-additive gene action in the expression of various traits. Again The ratio of σ² GCA to σ² SCA was less than one for all of the characters which indicates the predominant role of non-additive type of gene action play in the inheritance of all the characters studied. Among the parents BCP/S₄-29, BCP/S₄-31 and tester VS/S₃-1 and VS/S₃-26 were good general combiners for baby corn yield and important yield contributing characters. Considering baby corn yield, number of cobs/plant and other performances BCP/S₄-2×VS/S₃-1, BCP/S₄-5×VS/S₃-8, BCP/S₄-10×VS/S₃-8, BCP/S₄-22×VS/S₃-26 and BCP/S₄-29×VS/S₃-1 were selected as promising baby corn hybrids.

Keywords: General combining ability, Specific combining ability, Gene action, Inheritance, Baby corn.

Location: Joydebpur, Gazipur

Start Date: 00-00-2014

End Date: 00-00-2015

Program Area: Variety and Species

Commodity: Maize

Objectives:

To get information regarding general and specific combining ability and gene action in inheritance of different yield contributing traits of baby corn.

Methodology:

Seven S₄lines of baby corn were used as female lines and three S₃ lines of baby corn hybrid Victory Super were used as tester to produce 21 baby corn hybrids in 2013-14. The 7 lines and 3 testers and their 21 F₁’s with standard check variety ‘Baby Star’ were planted in Randomized Block Design with two replications during rabi 2014-2015 at Bangladesh Agricultural Research Institute, Joydebpur, Gazipur. Each entry had one row of 4m length in each replication. The plants were spaced 60 cm apart between rows and 20 cm with in the row. All the recommended cultural practices were followed to raise a healthy crop per hill. Data were recorded on 10 randomly selected plants in each row with respect plant height (cm), upper ear height (cm), lower ear height (cm), green fodder yield per plant (g), days to first picking, days to second picking, days to third picking, days to fourth picking, harvest duration, number of cobs/plant, baby corn yield per plant (g), cob yield without husk per plant (g), ear length(cm) and ear diameter (cm). Mean values were subjected to statistical analysis as per model suggested by Kempthorne (1957) and procedure of Singh and Chaudhary (1985).

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 that genotypes exhibited highly significant differences among themselves for all the traits studied. The crosses exhibited significant differences, indicating varying performance of cross combinations. When the effects of crosses partitioned into lines, testers and line × tester effects, the interaction effects (line × testers) were found to be significant for all the traits under study indicating that hybrids differed significantly in their sca effects. Except ear length all the traits showed significant variations among lines and mean sum of squares due to tester were larger than due to lines, indicating greater diversity among testers for lower ear height, harvest duration, number of cobs/plant, cob yield with husk per plant, baby corn yield per plant, ear length and ear diameter. The parents exhibited significant differences for all the traits indicating greater diversity in the parental lines. The parents vs. crosses which indicates average heterosis, was also significant for all traits, thus considerable amount of average heterosis was reflected in hybrids. Highly significant differences were observed for line x tester interaction for all traits which implies the role of dominance and non-additive effects in all traits. Therefore, both additive and non-additive effects were responsible for controlling these traits. proportional contribution of lines was higher for plant height, upper ear height, lower ear height, days to first picking, days to second picking, days to third picking, days to fourth picking, harvest duration and cob yield with husk per plant, indicating their predominant maternal influence. Testers showed less influence to be contributed for all the traits except ear length. The relative contribution of line × tester interaction was more important for green fodder yield per plant, number of cobs/plant, interval between two cob picking, cob yield without husk per plant, ear length and ear diameter. The higher contribution of interactions of the line × tester than lines and testers, indicating higher estimates of variances due to non-additive genetic effects and the importance of specific combining ability. The ratio of σ² GCA to σ² SCA was less than one for all of the characters which indicates the predominant role of non-additive type of gene action play in the inheritance of all the characters studied.

The lines BCP/S₄-29 and BCP/S₄-31 were the best among the parents and VS/S₃-1 among the 3 testers, as it showed desirable mean and GCA effects for most of yield and its contributing traits. Therefore these parents could be used extensively in hybrid breeding program with a view to increase baby corn yield with quality. Furthermore, based on mean and SCA effects of baby corn yield and number of cobs/plant 4 hybrids viz. BCP/S₄-2×VS/S₃-1, BCP/S₄-5×VS/S₃-8 , BCP/S₄-10×VS/S₃-8 and BCP/S₄-22×VS/S₃-26 were proved to be the best to increase the baby corn yield. For varietal improvement, these crosses could also be utilized for exploiting promising recombinants and it could be useful towards enhancing baby corn yield.

Knowledge Management: Report/Proceedings