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Line X Tester Analysis in Hybrid Rice (oryza Sativa L.)

A S M S Alam
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

U Sarker
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

M A K Mian
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

Abstract/ Executive Summary:

An experiment comprising 5 line x 5 tester mating design was conducted to study the nature and magnitude of gene action i.e. general combining ability (GCA) and specific combining ability (SCA) of eight yield and yield contributing characters in rice at Bangabandhu Sheikh Mujibur Rahman Agr icultural University, Gazipur, Bangladesh during June 2004 to June 2005. Highly significant genotypic differences were observed that revealed the wide range of variability among the genotypes studied. The SCA variances were found significant for most of the characters while GCA variances were not significant for all the characters. Higher ratio of SCA and GCA variances indicating preponderance of non-additive gene actions in the inheritance of all the characters except filled spikelets per panicle. Among the CMS parents, IR75595A and IR62H29A were found to be good general combiner for most of the characters. Among the male parents. BAU509R and BAU525R were observed to be good general combiner for most of the character studied . Cross combinations, IR62829A x BAU509R , 1R62829A x BAU523R , Jin23A x BAU507R, DakshahiA x BAU525R and LuhaguraA x BAU523R were observed to be good spcci tic cross combinations for gra in yie ld and most of other seven yield related characters.

Keywords: Line X Tester, Hybrid rice, General comhining ability, Specific combining ability

Location: Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

Start Date: 00-06-2004

End Date: 00-12-2004

Program Area: Variety and Species

Commodity: Rice

Objectives:

To find out suit able general and specific combiners for hybrid programme .

Methodology:

Ten high yielder inbred line:-, (five cytoplasmic male sterile lines and five mother lines) and 25 I 1 were grown in a line x tester mating design at Bangabandhu Seikh Mujibur Rahman Agricultural University, Gazipur, during June 2004 to December 2004. The experiment was conducted in Randomized Complete Block Disign with two repli cations. The experimental unit constitutes a single row of 5m long. Forty days old seedlings were transplanted with single seedling per hill and 20 x 10 cm spacing. Urea, TS;P.MP. Gypsum and Zinc sulphate were applied @ 270-130- 120-70-10 kg/ha, respectively as recommended for hybrid rice. The soil of the experimental plots belong to Madhupur tract wit h P11 of 6.5-5.5. Data were collected nn plant height (em), number of tillers per hill, panicles per hill. panicle length (em). Idled spikelets per panicle. panicle weight (g). 1000 grain weight (g). and grain yield per hill (g). Analysis, of variance was done on sample mean basis for all the traits. Combining abilit y analysis was done using line x tester method (Kempthorne, 1957). The variance for general combiningability (GCA) and specific combining ability (SC A) were tested against their respective error variances derived from ANOVA reduced to mean level. Significance test for GCA and SCA effects were performed using t-test.

Source of Information: Ann. Bangladesh Agric. (2007) 11(1): 37-44

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The information of the nature of gene action w ith respective vari ety and characters might be used depending on the breeding objectives. The CMS lines 1R75595A and JR 62829A could be used in production of diversified CMS lines as well as hybrid seed production with BAU509R and BAU525R good general combiner male parent . Five good specific crss combinations could be tested further.

Knowledge Management: Journal