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Estimation of Standard Heterosis for Yield Related Traits in Developed Test Hybrids

M A Islam
GETCO Agrovision Limited, Bangladesh

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

M K Bashar
IRRI, Bangladesh

Fatema-Tuj-Johora
Dept. of Genetics and Plant Breeding BSMRAU, Gazipur

M A Habib
Agril Development, CSISA-SRSPDS, IRRI, Bangladesh

Abstract/ Executive Summary:

To estimate heterotic performances of newly developed test hybrids utilizing CMS system an experiment was carried out at the experimental farm, Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur during Rabi 2011 following RCBD design. Five known CMS lines and sixteen developed R-lines were crossed through line × tester analysis. Eighty test hybrids were developed. Heterosis in yield varied from -90.83 to 189.40%. Highly significant heterosis were found from the crosses of IR58025A with 6 R-lines i.e., RG-BU 08-006R (42.46**), RG-BU 08-013R (61.74**), RG-BU 08- 018R (24.86*), RG-BU 08-046R (28.54**), RG-BU 08-063R (30.55**), RG-BU 08- 105R (36.62**). Three crosses of IR62820A were shown exhibiting significant positive standard yield heterosis with RG-BU 08-007R (70.69**), RG-BU 08-063R (31.28**), RG-BU 08-097 R (52.43**). Seven F1s crosses of GAN 46A showed significant positive standard yield heterosis with RG-BU 08-001R (22.45*), RG-BU 08-005R (50.04**), RG-BU 08-013R (21.82*), RG-BU 08-025 R (47.46**), RG-BU 08-038R (57.02**) and RG-BU 08-057R (62.51**). Whereas three crosses of IR 68888A showed significant positive standard yield heterosis with RG-BU 08-007R (33.14**), RG-BU 08-018 R (67.31**) and RG-BU 08-097R (22.45*). It was observed that 5 crosses of BRRI 1A showed significant positive standard yield heterosis with R-lines RG-BU 08-001R (41.25**), RG-BU 08-005R (31.87**), RGBU 08-016R (74.31**), RG-BU 08-025R (71.67**) and RG-BU 08-063R (31.92**). Crosses of four R-lines (RG-BU 08-001R, RG-BU 08-025R, RG-BU 08-038R and RG-BU 08-097R) showed significant positive standard yield heterosis with all 5 CMS lines. These crosses showed remarkable variations in the expression of standard heterosis for yield and yield components.

Keywords: CMS lines, Sixteen R-lines, Yield, Line × tester analysis

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

Start Date: 00-00-2011

End Date: 00-00-2011

Program Area: Variety and Species

Commodity: Rice

Objectives:

The present investigation was undertaken to estimate standard heterosis for grain yield and its components in exotic hybrid rice genotypes.

Methodology:

The experiment was carried out at the experimental farm, Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur during Rabi 2011. The experimental site is located at the centre of Madhupur Tract (24º29 N latitude and 90º26 E longitude) having an elevation of 8.2m from the sea level. The soil type of experimental field belongs to the Shallow Red Brown Terrace type under Salna Series of Madhupur Tract of Agro Ecological Zone (AEZ 28 which is characterized by sandy clay with pH value of 6.5. The climate of the experimental site is subtropical in nature. Five known CMS lines and sixteen developed R-lines were crossed through line × tester analysis and 80 test hybrids were developed. These 80 test hybrids were sown in the subsequent generation to asses’ heterotic performances in randomized complete block design. Data on the following parameters were recorded from 10 randomly selected plants and on whole plot basis for plant height (cm), effective tillers per plant, primary branches per panicle, secondary branches per panicle, out crossing rate and grain yield (t/ha). Data obtained for each character was subjected to the analysis of variance following three replicated randomized complete block design by using MSTAT-C computer software ANOVA-2 and the analysis of variance for each of the characters was performed by F-test. Mean, range and standard deviation for each character were also estimated for the hybrids performed by Microsoft Excel program 2007. Standard heterosis was calculated as percentage increase or decrease of F1 mean performance over the mean performance of check variety.

Source of Information: Eco-friendly Agril. J. 6(04): 72-77, 2013 (April); ISSN 1999-7957

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It is observed that crosses of five R-lines viz. RG-BU 08-001R, RG-BU 08-025R, RG-BU 08-038R, RGBU 08-057R and RG-BU 08-097R with all 5 CMS lines showed significant positive standard yield heterosis. These crosses showed marked variations in the expression of standard heterosis for yield and yield components. The higher grain yield might be due to higher amount of effective tillers/plant, higher number of filled grains/panicle and maximum out crossing rate.

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