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Combining Ability of Grain Characters in an 8×8 Diallel Cross of Rice (oryza Sativa L. )

K. M. Iftekharuddin
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh.

M. A. Newaz
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh.

M. A. Salam
Genetic Resources & Seed Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh.

Khaleda Akter
Genetic Resources & Seed Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

An investigation was done to examine combining ability for grain characters in rice using an 8-parent diallel cross excluding reciprocals during Transplanted Aman season, 2002. Both additive and non-additive genetic components were important in the expression of grain characters. Except for embryo weight there was preponderance of additive genetic component. BRRI dhan28, Minikit, IR65610-38-2-4-2-6-3 and Amol3 were good general combiners for the development of rice varieties with long, slender and thin grain, ZhongYu7, IR8 and BR4828-54-4-1-4-9 showed good general combining ability for the development of rice varieties with high endosperm weight. Since small size of upper and lower empty glumes are preferred in rice, IR65610-38-2-4-2-6-3 and ZhongYu7 were good general combiners for empty glume length. IR8 was found good general combiner for high endosperm weight. Estimates of specific combining ability showed that the best specific combination for long grains and long kernels were ‘IR8 × IR65610’ and ‘IR8 × Minikit’, respectively. ‘BR4828 × ZhongYu7’ for wide, thick grain and wide kernel, ‘BR4828 ×IR8’ for thick kernel, ‘BR4828× Minikit’ for slender kernel, ‘BR4828 × IR65610’ for thin grain and thin kernel, ‘IR8 × Minikit’ for high endosperm weight displayed maximum specific combining ability. In case of endosperm weight, poor × poor, good × good and poor × good crosses produced both positive and negative effects reflecting the difficulties of increasing endosperm weight in rice. Development of long grains with thin breadth and thickness was found difficult due to complex gene action.

Keywords: Combining ability, Diallel, Grain characters, Rice, Oryza sativa L.

Location: Bangladesh Rice Research Institute, Gazipur.

Start Date: 01-06-2002

End Date: 31-12-2002

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To assess the nature and extent of gene action on different grain characters through diallel analysis.

Methodology:

Eight genotypes of rice viz. BRRI dhan29 (BR29), BR4828-54-4-1-4-9 (BR4828), BRRI dhan2 (BR28), IR8, Amol3, IR65610-38-2-4-2-6-3 (IR65610), Minikit and ZhongYu7 with different grain characters were crossed in an 8 × 8 diallel design excluding reciprocals. Twenty-eight F1s and 8 parents were grown in a Randomized Complete Block Design with three replications at Bangladesh Rice Research Institute, Gazipur in Transplanted Aman season, 2002. Twenty-five day old seedlings rows transplanted @ single seedlings/hill with a spacing of 25 × 20 cm. The unit plot size was 2m × 2 rows. Data of 10 grains from 10 randomly selected panicles were recorded on grain length (mm), grain breadth (mm), grain thickness (mm), Kernel length (mm), kernel breadth (mm), kernel thickness (mm), upper empty glume length (mm), lower empty glume length (mm) and endosperm weight (g) and embryo weight (mg). Grain and Kernel length, breadth thickness were measured by a digital slide caliper while micrometer was used for the measurement of upper and lower empty glume length. Endosperm weight and embryo weight were taken using sensitive electronic balance. Moisture content of endosperm was measured by moisture mater and adjusted at 14%, Griffing’s (1956) method 2, Model 1 (Fixed effects model) was used for combining ability analysis of the grain characters.

Source of Information: SAARC JOURNAL OF AGRICULTURE, Vol. 6, Issue 1, 2008, pp. 29-38, ISSN 1682-8348, SAARC Agricultural Information Centre.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In this study it was found that, development of long slender varieties may be possible from the cross "BR4828 X BR28", whereas development of long bold grain rice varieties could br obtained from "BR28 X Amol13" cross combination.

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