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Combining Ability Analysis in Rice (oryza Sativa L.)

A. Akter
Hybrid Rice Project Bangladesh Rice research Institute, Gazipur, Bangladesh.

M. J. Hasan
Hybrid Rice Project Bangladesh Rice research Institute, Gazipur, Bangladesh.

H. Begum
Hybrid Rice Project Bangladesh Rice research Institute, Gazipur, Bangladesh.

M. U. Kulsum
Hybrid Rice Project Bangladesh Rice research Institute, Gazipur, Bangladesh.

M. K. Hossain
Hybrid Rice Project Bangladesh Rice research Institute, Gazipur, Bangladesh.

Abstract/ Executive Summary:

Twenty hybrids were produced using five CMS lines viz., BRRI3A, BRRI9A, IR73328A, BRRI10A and IR78355A and four restorers viz., BRRI12R, BRRI13R, BRRI14R and BRRI15R following line x tester mating design to find out the best combination (s) in respect of their combining ability effects among the parents and hybrids at BRRI, Gazipur, Bangladesh from July 2008 to May 2009. Data were recorded from yield and yield contributing agronomic characters each entry through out the replications and mean values were subjected to line x tester analysis. The genotypes were found highly significant for all the traits which indicated that the treatments used in this study were significantly varied from each other. After the partitioning of mean sums of squares (MSS) of the treatments into parent, cross and parent vs cross. They were found highly significant except yield per plant for parent, panicle weight for crosses and leaf area index for parent vs cross. The ratio of GCA and SCA variances were found less than unity for all the characters except plant height, days to maturity and panicles per square meter. The relative contribution of line, tester and combinations of line x tester interaction of ten characters were calculated and found that panicle weight contributed the highest (69.53%) followed by thousand grain weight (63.62%), yield per plant (54.76%), panicle per meter square 51.52% in their hybrids. IR73328A was identified as good general combiner for shorter plant height (-6.09) and panicle per square meter (16.92). BRRI10A and IR78355A produced significant positive GCA for yield per plant which could be regarded as good general combiner for higher grain yield. Six hybrid combinations were found with significant and positive SCA effect of which the highest value was obtained from BRRI3A/BRRI14R (2.46) followed by IR73328A/BRRI13R (2.23) for yield per plant.

Keywords: Combining,Effect, Ability,Rice, Hybrid

Location: BRRI, Gazipur

Start Date: 00-07-2008

End Date: 00-05-2009

Program Area: Variety and Species

Commodity: Rice

Objectives:

To find out the best combination (s) in respect of combining ability effects among the parents and hybrids at BRRI, Gazipur,

Methodology:

Twenty hybrids were produced using five CMS lines viz., BRRI3A, BRRI9A, IR73328A, BRRI10A and IR78355A and four restorers viz., BRRI12R, BRRI13R, BRRI14R and BRRI15R following line x tester mating design. Thirty-day-old seedlings were transplanted at 15x20 cm spacing in RCB design with replications on January 25, 2009. Fertilizers @ 270:130:120:70:10 kg urea, TSP, MOP, gypsum and zinc per hectare of land were applied. All fertilizers along with 1/4 urea and 2/3 MP were applied at final land preparation. Remaining urea was top dressed in three equal split at first 10 February 2009 at 15 days after transplanting, second on 2 March 2009 at 35 days after transplanting, and on 21 March 2009 at PI stage. Remaining 1/3 MOP was applied during 2nd top dress of urea. Intercultural operations, irrigation were performed when necessary. Insect pest were controlled at vegetative, booting and at flowering stage with applying Malathione 57 liquid @ 1.0 L/ha, Diazenone 10G@16.5 kg/ha. Weeds were control three times during urea top dressing. Data were collected on the parameters included yield contributing agronomic characters viz. plant height (PH), days to maturity (DTM), panicle per square meter (PSM), spikelets per panicle (SPP), spikelet fertility (SF), panicle length (PL), leaf area index (LAI), panicle weight (PWT), 1000 grain weight (TGWT), yield per plant (YPP). The data were recorded from each entry through out the replications and mean values were subjected to line x tester analysis. The standard procedures developed by Kempthorne (1957) were followed to estimate the mean sum of squares (MSS) along with variances of SCA and GCA. Standard statistical tools (Singh and Choudhury, 1985) were used to analyze the combining ability effects.

Source of Information: Bangladesh J. Pl. Breed. Genet., 23(2): 07-13, 2010

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The genotypes were found highly significant for all the traits which indicated that the treatments used in this study were significantly varied from each other. After the partitioning of mean sums of squares (MSS) of the treatments into parent, cross and parent vs cross. They were found highly significant except yield per plant for parent, panicle weight for crosses and leaf area index for parent vs cross. The ratio of GCA and SCA variances were found less than unity for all the characters except plant height, days to maturity and panicles per square meter. The relative contribution of line, tester and combinations of line x tester interaction of ten characters were calculated and found that panicle weight contributed the highest (69.53%) followed by thousand grain weight (63.62%), yield per plant (54.76%), panicle per meter square 51.52% in their hybrids. IR73328A was identified as good general combiner for shorter plant height (-6.09) and panicle per square meter (16.92). BRRI10A and IR78355A produced significant positive GCA for yield per plant which could be regarded as good general combiner for higher grain yield. Six hybrid combinations were found with significant and positive SCA effect of which the highest value was obtained from BRRI3A/BRRI14R (2.46) followed by IR73328A/BRRI13R (2.23) for yield per plant.

Knowledge Management: Journal