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Combing Ability of Cms and Restorers in Rice (o. Sativa L.)

P. S. Biswas
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh

A. W. Julfiquar
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh

M. Wazuddin
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

General and specific combining ability effects were estimated from a 5 line × 8 tester crosses to explore the genetic behavior of CMS and restorers in rice. The variance for GCA and SCA showed predominance of non-additive gene action for all the ten morphophysiological traits. The estimates of GCA effects revealed that none of the parent was general combiner for all the traits in desired direction. Gan46A and BR827R were good general combiners for higher grain yield coupled with earliness, and IR46R and BR168R was good general combiner for grain yield and lateness in maturity. Good x poor general combiners (Gan46A × Gui99R) for grain yield produced the best specific cross for higher grain yield coupled with earliness, longer panicle, panicles/plant, filled grains/panicle and less sterility (%). Additive × additive, additive × dominance and dominance × dominance gene interactions were involved in deriving good specific cross for grain yield.

Keywords: GCA and SCA effects, Gene interaction, CMS, Restorer, Rce.

Location: Bangladesh Rice Research Institute (BRRI)

Start Date: 00-11-2001

End Date: 00-04-2002

Program Area: Variety and Species

Commodity: Rice

Objectives:

A study was undertaken to estimate the nature and magnitude of gene action and to explore suitable combination of male sterile and restorer lines with high yield potential.

Methodology:

Forty crosses were made using 5 cytoplasmic-genetic male sterile (CMS) lines and 8 restorer lines following Line X Tester model in 2002. The F1 hybrids (40) along with their parents (13) were grown in the experimental field of Bangladesh Rice Research Institute (BRRI) in the Boro season, 2003. Single seedling of thirty day old was transplanted with a spacing of (20 × 15) cm² in RCB design with three replications. The unit plot size was 1.8m × 5 rows. The crop management was done at par with BRRI recommendation for hybrid rice (BRRI, 2003). Data on leaf area index (LAI), plant height, days to 50% flowering, panicles/plant, panicle length, filled grains/panicle, spikelet sterility, harvest index, 1000- grain weight and grain yield/plant were recorded from ten randomly selected plants from each entry. Analysis of variance (ANOVA) for general combining ability (GCA) and specific combining ability (SCA) effects were estimated according to Kempthorne (1957).

Source of Information: Bangladesh J. Pl. Breed. Genet., 20(1): 13-18, 2007

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

These observations indicated that additive x additive, additive x dominance and dominance x dominance gene interaction were responsible for derivation of good specific cross for higher grain yield.

Knowledge Management: Journal