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Genetic Diversity in Restorer Lines of Hybrid Rice

Dr. Md. Jamil hasan
Principal Scientific Officer
Hybrid Rice division Bangladesh Rice Research Institute Gazipur-1701

Umma Kulsum
Scientific Officer
Hybrid Rice Division Bangladesh Rice Research Institute Gazipur-1701

Abstract/ Executive Summary:

An experiment was conducted with 30 restorer lines to identify most diverse lines in respect of morphological traits for developing heterotic rice hybrids. Thirty restorer lines were classified into four distinct clusters based on mean values of different morphological traits and days to maturity. Again these restorer lines were partitioned into very early, early, medium and late maturing groups. Only one line in very early maturing group had tall plant stature with maximum thousand grain weight but less in yield potential. Early maturing group contained 8 lines from different clusters having short plant stature with short flag leaf and moderate yielding ability. Medium maturing group included 13 lines characterized by medium plant stature with high tillering, excellent spikelet fertility, high grains per panicle and very good yielding ability. Late maturing group contained 8 lines featured by tall plant stature with excellent yield and yield contributing characters. Late maturing restorers BR827R, BR168R and BR736R had maximum genetic distance from centroid indicating extent of heterosis and very high yielding ability. Combining ability and heterosis study with short duration CMS lines may be fruitful for the development of desired hybrid.

Keywords: Restorer lines; Morphological traits; Combining ability, CMS, Hybrid rice

Location: BRRI HQ, Gazipur

Start Date:

End Date:

Program Area: Conservation and Biodiversity

Commodity: Rice

Objectives:

To evaluate the restorer lines of hybrid rice based on cluster analysis and days to maturity.

Methodology:

Thirty restorer lines were evaluated to identify most diverse lines in respect of morphological traits for developing heterotic rice hybrids based on clustering and days to maturity. Twenty one days old single seedling was transplanted with a spacing of 20cm x 15cm in RCB design with three replications. The unit plot size was 1 .8m x 1 .0m. Adequate soil fertility was ensured by applying Urea-TSP-MP-Gypsum-ZnSO₄ @ 150:100:70:60:10 kg/ha, respectively. Total TSP, MP, Gypsum and ZnSO₄ were applied during final land preparation. The urea was applied in three installments, at 15 days after transplanting (DAT), 30 DAT and 45 DAT. Necessary intercultural operations was carried out during cropping period for proper growth and development of the plants. Ten sample plants were randomly selected from each plot excluding the border plants and the following data were recorded: Plant height (cm), number of effective tillers per plant, days to 50% flowering, flag leaf length (cm), panicle weight (g), spikelet fertility (%), grains per panicle, days to maturity, 1000 grain weight (g) and grain yield per plot (kg).

Source of Information: Bangladesh Journal of Plant Breeding & Genetics,25(2): 09-14, 2012

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 15000/-

Total Budget (Tk.) : 15000/-

Achievement/Findings:

Out of 30 restorer lines cluster 1 included restorer lines from medium and late maturing groups but late maturing group had the highest yield potentiality. So, combining ability and heterosis study between late maturing high yield potential restorer lines with medium duration stable CMS lines may yield desired type hybrid combination that perform better under local condition.

Knowledge Management: Journal