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Combining Ability for Yield and Yield Associated Traits in Rice (oryza Sativa)

M. U. Kulsum
Senior Scientific Officer
Hybrid Rice Division, BRRI, Gazipur

K M Iftekharuddaula
Cheif Scientific Officer
Plant Breeding Division, BRRI, Gazipur

M M H Saikat
Professor
Dept. of Genetics & Plant Breeding, BSMRAU, Gazipur

M A Karim
Professor
Dept. of Agronomy, BSMRAU, Gazipur

M A K Mian
Professor
Dept. of Genetics & Plant Breeding, BSMRAU, Gazipur

M G Rasul
Professor
Dept. of Genetics & Plant Breeding, BSMRAU, Gazipur

Abstract/ Executive Summary:

Twenty hybrids developed using five CMS lines and four restorers along with their parents were evaluated for ten quantitative traits to explain the nature of gene action present in the inheritance these traits. ANOVA revealed significant difference among the genotype, crosses and parents. Variance of sca was higher than that of gca for all the characters suggesting the significant role of non-additive gene action on the inheritance of these character. The relative contribution of lines, testers and combination of line × tester for all characters were calculated. It was found that lines were more important and their contribution was high for most of the traits indicated highly influence by maternal effects. The cross IR58025A/ BR9157-12-2-37-13-71-32R was the best specific combiner for grain yield. Estimates of gca effects showed that BRRI13A and BR9157-12-2-37-13-15-40R were the best general combiner for improving yield and other characters. The cross BRRI33A/ BR9159-8-5-49-1-1R was found to be a good specific combiner. The cross combination of good general combiner would not always produce the best specific crosses. Moreover, the predominance of production of the best specific crosses from high × low and low × low combiners reported the influence of non-additive and over-dominance gene action.

Keywords: L × T analysis, GCA, SCA, Grain yield, Hybrid rice.

Location: BRRI, Gazipur

Start Date: 25-12-2015

End Date: 28-10-2016

Program Area: Variety and Species

Commodity: Rice

Objectives:

A comprehensive study was undertaken on the basis of different agronomic and morphological characters for assessing the combining ability of selected parents and their hybrids and estimating the nature of gene action and magnitude of heterosis.

Methodology:

The experimental material consists of nine rice genotypes viz IR58025A, IR79156A, BRRI33A, BRRI13A, and BRRI7A were used as female (designated as lines) and four genotypes (BR9157-12-2-37-13-15-40R, BR9157-12-2-37-13-17-32R, BR9159-8-5-49-1-1R and BR9159-8-5-40-13-8R) were used as male designated as tester. These parents were crossed to produce 20 F₁hybrids according to line × tester mating design (Kempthorne, 1957). This study was conducted in consecutive two years comprising of Boro 2015-16 and T. Aman 16 at Research station of Bangladesh Rice Research Institute, Gazipur. In Boro season of 2015-16 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 m² plots in a RCBD (randomized complete block design) with three replications. Data were recorded on plant height (PH) (cm), days to 50% flowering (DF) (days), days to maturity (DM) (days), panicle length (PL) (cm), panicle weight (PW) (g), number of panicle/m² (PPM), number of spikelet/panicle (SPP), spikelet fertility (SF), 1000 grain weight (TGW) (g) and grain yield (YLD) (t/ha) based on standard evaluation system of rice (Scshu, 1988). Collected data were subjected to statistical analysis using line × tester analysis by Kempthorne (1957).

Source of Information: Ann. Bangladesh Agric (2017) 21 (1&2): 1-11

Article Link (Online Journal):

Funding Source:

1. Bangladesh Agricultural Research Council

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The sense of gene action is very useful to a plant breeder in the selection of parents for hybridization. GCA as well as sca variance were found to be significant in the findings. GCA effects suggested that the parents BRRI33A and BR9157-12-2-37-13-15-40R were good for general combiner for grain yield and BRRI13A, BRRI7A, BR9157-12-2-37-13-15-40R and BR9159-8-5-40-13-8R for earliness, BRRI13A, BRRI7A, BR9157-12-2-37-13-15-40R, BR9157-12-2-37-13-17-32R and BR9159-8-5-40-13-8R for short statured plant. The crosses IR58025A/ BR9157-12-2-37-13-17-32R, IR79156A/ BR9157-12-2-37-13-17-32R, IR79156A/ BR9159-8-5-40-13-8R, BRRI33A/ BR9159-8-5-49-1-1R, BRRI33A/ BR9159-8-5-40-13-8R, BRRI13A/ BR9157-12-2-37-13-15-40R, BRRI13A/ BR9159-8-5-49-1-1R and BRRI7A/ BR9159-8-5-49-1-1R showed high sca effects for grain yield. These could be used in hybrid development after further evaluation. The crosses showing high sca effects involving high × high general combiners could be utilized for the purpose of developing high yielding genotypes and obtaining transgressive segregants in F₂ generation.

Knowledge Management: Journal