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Genetic Variability of Some Cytoplasmic Male Sterile Lines (cms) of Rice (oryza Sativa L.) Genotypes

Dr. Md. Jamil Hasan
Principal Scientific Officer
Head Hybrid Rice Division Bangladesh Rice Research Institute Gazipur-1701

Mst. Umma Kulsum
Scientific Officer
Hybrid Rice Division BRRI HQ, Gazipur-1701

Abstract/ Executive Summary:

The desirable characteristics of fourteen genetically diverse CMS lines were assessed for their phenotypic acceptability, plant height (cm), days to 50% flowering. panicles per plant, stability for pollen sterility, panicle exertion rate and out crossing rate. The CMS lines viz. BRRI1A. IR58025A. BRRI10A. BRRI9A. BRRI3A, IR75608A, and II32A have been found to be usable female parents for hybrid rice breeding due to their appreciable phenotypic acceptability, stable pollen sterility, panicle exertion rate and good out crossing rate. Panicle exertion rate of CMS lines had moderate heritability (3 8.34%) coupled with low genetic advance (2.34%) expected in the subsequent generations, that proved to be vulnerable to environmental fluctuation. The genotypic and phenotypic coefficient of variation was not remarkably varied from each other for most of the characters studied, indicated negligible environmental influence on these traits. Overall genetic correlation coefficients were higher than corresponding phenotypic correlation coefficients indicated strong relation present among the studied characters.

Keywords: Genetic variability, CMS lines, Rice.

Location: BRRI head quarter, Gazipur

Start Date: 00-00-2007

End Date: 00-00-2008

Program Area: Variety and Species

Commodity: Rice

Objectives:

The study was undertaken to study the variability of some CMS lines for different characters to access their pollen sterility status and other desirable characters for using in hybrid rice breeding program.

Methodology:

The experiment was conducted at the experimental field of Bangladesh Rice Research Institute (BRRI), Gazipur during Boro season 2007-2008. Fourteen genotypes of different origin were used in the study. The experiment was laid out in completely randomized design with three replications. Thirty days old seedlings were transplanted in a single row of 15 plants using single seedlings per hill with the spacing of 20 cm x 20 cm. Fertilizer application and other cultural management practices were performed as per recommendation of Boro season. Days to first flowering, days to 50% flowering, plant height, effective tillers per plant, panicles per plant, panicle length, panicle exertion rate, out crossing rate, and pollen sterility status of the CMS lines were determined by staining pollen grains in 1.5% Potassium Iodide Iodine (IKI) solution. Based on iodine and starch interaction pollen grains were classified into typical abortive, round sterile and partial stained types and microscope count was taken and expressed in terms of percentage. Two to three plants were bagged at heading stage and mean sterility was recorded properly.

Source of Information: Bangladesh Journal of Agricultural Research 36(2):263-270, June 2011

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 15,000/-

Total Budget (Tk.) : 15,000/-

Achievement/Findings:

The CMS lines viz. BRRI1A. IR 58025A. BRRI10A. BRRI9A. BRRI3A, IR75608A, and II32A have been found to be usable female parents for hybrid rice breeding due to their appreciable phenotypic acceptability, stable pollen sterility, panicle exertion rate and good out crossing rate. Panicle exertion rate of CMS lines had moderate heritability (3 8.34%) coupled with low genetic advance (2.34%) expected in the subsequent generations. Using this genetic variability specially in floral traits will be vital for CMS lines selection for heterosis breeding and hybrid rice seed production

Knowledge Management: Journal