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Genetic Parameters and Correlation Among Floral Characters in Local Fine Rice

A.K. Roy
Senior Instructor
CERDI, Gazipur

M.A. K Miha
Professor
Department of Genetics and Plant Breeding, BSMRAU, Salna, Gazipur

B.C. Nath
Scientific Officer
Farm Machinery and Postharvest Division, BRRI, Gazipur-1701

S. Ghosal
Scientific Officer
Plant Breeding Division, BRRI, Gazipur-1701

P.L. Biswas
Senior Scientific Officer
Hybrid Rice Project, BRRI, Gazipur-1701

Abstract/ Executive Summary:

The experiment was conducted to study variability, genetic parameters and correlation between seven out crossing floral traits in fine rice genotypes. Significant variations were observed in the genotypes for all the characters studied viz. duration of open floret (DOF), angle of open floret (AOF), stigma length (SL), stigma breadth (SB), anther length (AL), anther breadth (AB) and filament length (FL). Considering genetic parameters high genotypic coefficient of variation (GCV) value was observed for FL followed by SL and SB. High broad sense heritability with high genetic advance in percent of mean (GAPM) was observed for FL followed by SL and SB also. Anther length (AL) showed lowest broad sense heritability with lowest GAPM. The Correlation analysis among seven floral traits (inter character association) revealed that anther length vs stigma length had highest positive correlation coefficient value (r) and it was followed by Anther breadth vs, stigma length, stigma breadth vs. duration of open floret and anther length vs. stigma breadth.

Keywords: Genetic variability, Correlation, Fine rice, Heritability, Genetic advance

Location: Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Start Date: 00-07-2006

End Date: 00-12-2006

Program Area: Variety and Species

Commodity: Composition, Fine rice

Objectives:

In a hybrid breeding program, selection of component lines with desirable floral traits is very important. For this purpose variability and correlation study of floral traits is helpful to select component lines for hybrid production. Variability and correlation study on rice floral traits, especially in fine rice is rare; in these circumstances, this piece of study is very relevant for identification of maintainer lines in Bangladeshi fine rice.

Methodology:

The experiment was conducted at the field laboratory, Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, during Amon season in 2004. The trial consisted of ten identified maintainer of local fine rice collected form different location of the country.

The entries were grown in a Randomized Complete Block Design (RCBD) with three replications. Twenty five days old seedlings were transplanted in 3.60 m2 plots with a spacing of 20 cm x 15 cm, using single seedling per hill. Fertilizers were applied @ 130, 50, 60, 33 and 5 kg N, P, K, S and Zn per hectare. All the fertilizers except urea were applied at final land preparation. Total urea was applied in two installments, at 20 DAT (days after transplanting) and 50 DAT. Intercultural operations and pest control measures were done as and when necessary. Data on seven floral characters viz. , duration open floret in min. (DOF), angle of open floret in degree (AOF), stigma length in μ (SL), Stigma breadth in μ (SB), anther length in μ (AL),anther breadth in μ (AB) and filament length in μ (FL) were recorded from 5 random plants of each plot. Duration of open floret recorded from the time of opening of the first spikelet on a panicle to the complete closure of all spikelets in that panicle in the same day. The angle of open floret was measured with protractor. The stigma and anther characters were measured under microscope using stage and occular micrometers. Genetic variance (S2 g) environmental variance (S2 e),phenotypic variance(S2 p), genotypic coefficient of variation (GCV), phenotypic coefficient of variation (PCV) heritability in broad sense (Hb), genetic advance in the percentage of mean (GAPM) and correlation coefficients (r) analysis were performed following Singh and Choudhury (1985). The estimate of GCV and PCV were classified as low, medium and high (Sivasubramanian and Madhavamenon, 1973). The heritability was categorized as suggested by Robinson et al. (1949). Again, genetic advance was classified by adopting the method of Johnson et al. (1955).

Source of Information: J. Sci. Technol. (Dinajpur) Vol. 6:75-79 (2008) ISSN 1994-0386

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

All significant correlations were positives except correlation between filament length and angle of open floret. Biswas et al (2000) reported significant negative and positive correlation between different traits of rice and supported these findings. Results of the study suggested that a wide variation exists among the floral characters of the tested local fine maintainer which might be helpful in breeding program for selecting better parent making better hybrid combination.

Knowledge Management: Journal