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Combining Ability of Different Yield Related Characters in Rice

M. J. Hasan
Hybrid Rice Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh

M. U. Kulsum
Hybrid Rice Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh

M. M. Rahman
Principal Training Officer, BARC, Farmgate, Dhaka-1215

Abstract/ Executive Summary:

Combining ability for yield and yield contributing character of rice was studied using five lines IR79156A, BRRI7A, BRRI33A, BRRI21A and IR75608A and four testers BRRI20R, BRRI31R, BRRI26R and BAU521R to produce 20 F₁ in line × tester fashion. The variances due to SCA were larger than the variance due to GCA for all the characters which indicate the prevalence of non-additive gene action. BRRI7A/BRRI31R cross combination was the best specific combiner for grain yield/plant. The predominance of non-additive genetic components was observed for all the traits which indicated that the improvement of the characters with greater non-additive genetic component could be contemplated for the exploitation of heterosis. Estimates of GCA effects showed that maternal line BRRI33A and paternal tester BRRI31R was an excellent general combiner for improving yield contributing traits. The cross IR79156A/BRRI20R was found as good specific combiner for most of the yield contributing traits viz., panicle length, panicle weight, number of spikelet/panicle, spikelet fertility, 1000 grain weight, harvest index and grain yield/plant. The cross between good general combiners did not always produce the best specific crosses. Moreover, the predominance of the production of the best specific crosses from high × low and low × low combiners indicated the influence of non-additive and over dominant gene actions on the yield and yield contributing traits.

Keywords: GCA, SCA, Line, Tester.

Location: Gazipur

Start Date: 00-00-2011

End Date: 00-00-2012

Program Area: Variety and Species

Commodity: Rice

Objectives:

To study the combining ability in order to identify good combiners and superior hybrid combinations.

Methodology:

The experimental material consists of nine rice genotypes viz.,IR79156A, BRRI7A, BRRI33A, BRRI21A and IR75608A were used as female (designated as lines) and four genotypes (BRRI20R, BRRI31R, BRRI26R and BAU521R) designated as tester were used as male. These parents were crossed to produce 20 F₁ hybrids according to line × tester mating design. This study was conducted in consecutive two years comprising of T. Aman 2011 and Boro season 2011-12 at Research station of Bangladesh Rice Research Institute, Gazipur. In T. Aman season of 2011 Line and Tester materials were grown separately in stagger fashion with an interval of 5 days so as to synchronize flowering. At flowering stage crossing was made in Line × Tester fashion to raise 20 F₁ test hybrids. Single seedlings of each entry were transplanted at 15×20 cm spacing in 3×5 m 2 plots in a RCBD (randomized complete block design) with three replications. In this study including traits are plant height, days to 50% flowering, days to maturity, panicle length, panicle weight, number of panicle/m 2, number of spikelet/panicle, spikelet fertility, 1000 grain weight, harvest index and grain yield/plant were evaluated based on standard evaluation rice system. Collected data were subjected to statistical analysis using line × tester analysis following Kempthorne (1957).

Source of Information: SAARC J. Agri., 12(2): 143-153 (2014)

Article Link (Online Journal): http://www.banglajol.info/index.php/SJA/article/view/21926/15041

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Predominance of non-additive genetic components over the additive genetic components was revealed in the inheritance of all the traits. It could be concluded that the improvement of the characters with possess greater non-additive genetic components could be contemplated for the exploitation of heterosis and with bi-parental mating. BRRI33A and BRRI31R was an excellent general combiner for improving yield contributing traits. The cross IR79156A/BRRI20R was the good specific combiner for most of the yield contributing characters. BRRI7A/BRRI31R cross combination was the best specific combiner for grain yield/plant.

Knowledge Management: Journal