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Character Association and Path Coefficient Analysis of Grain Yield and Yield Related Traits in Some Promising Early to Medium Duration Rice Advanced Lines

M.A. ISLAM
Department of Agronomy, Bangladesh Agricultural University, Mymensingh

S.A. Raffi
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh

M.A. Hossain
Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh

A.K. Hasan
Department of Agronomy, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

Evaluation of advanced lines is an important step in any crop improvement program. A field experiment was conducted using twenty-three rice genotypes including three check varieties during the period from June to December 2013 at the Agronomy Field Laboratory, Department of Agronomy, Bangladesh Agricultural University, Mymensingh to investigate the association among eight morpho-physiological traits including yield. The experiment was laid out in a randomized complete block design with three replications. Grain yield was found to be positively and significantly correlated with filled grain per panicle, plant height, days to 50% flowering and days to maturity both at genotypic and phenotypic levels, indicating the importance of these traits for yield improvement in rice. From the path coefficient analysis, it was revealed that days to maturity, days to 50% flowering, plant height, number of filled grain per panicle and grain length had a direct positive effect on yield, indicating these are the main contributors to yield. Eventually, it was recommended that, for obtaining increased rice yield, a genotype should possess more filled grains per panicle.

Keywords: Correlation coefficients, Path coefficient, Grain yield, Rice

Location: Agronomy Field Laboratory, Bangladesh Agricultural University (BAU), Mymensingh

Start Date: 30-06-2013

End Date: 30-11-2013

Program Area: Variety and Species

Commodity: Rice

Objectives:

To study the correlation among different traits at genotypic and phenotypic levels and their direct and indirect effects in terms of path coefficient analysis on grain yield of rice

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University (BAU), Mymensingh, during the period from July’ 2013 to December 2013. Twenty advanced lines (collected from Field Laboratory of Dept. of Genetics and Plant Breeding, BAU) and three check varieties viz. BR 11, BRRI dhan49, BRRI dhan57 were used in the present study. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Each replication consisted of twenty-three plots and each of the plots was 5.0 m². The seeds were soaked into the water on 11^th July 2013 for 24 hours and incubated in moist cloth sacks for 48 hours for quick germination. The pre-germinated seeds were sown in the seedbed on 14^th July 2013. One seedling per hill was transplanted to the main plot on the 04^th August 2013 when they were 21 days old. Row to row and plant to plant distance were 20 cm and 15 cm, respectively. Fertilizers were applied at the rate of Urea 170 kg, TSP 70 kg, MP 100 kg, Zypsum 80 kg and Cowdung 2 tons/ha. Gap filling was done within seven days after transplanting with the seedlings from the same sources to obtain a uniform plant population. Irrigation, drainage, and weeding were done as and when required. Insecticides and fungicides were sprayed only once. Ten sample plants were randomly chosen from each plot for recording observations on some morpho-physiological traits viz. plant height (cm), filled grain per panicle, days to 50% flowering, days to maturity, grain length (mm), grain width (mm), thousand-grain weight (g) and grain yield (t/ha). Genotypic and phenotypic correlation coefficients were calculated; path coefficient analysis was computed following the method suggested by Dewey and Lu.

Source of Information: Int. J. Expt. Agric. 5(1):8-12, (2015)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A clear understanding of the inter-relationship between the important traits related to yield is a must for designing an effective breeding program. The necessity of improving yield potential of existing rice genotypes hence, therefore, might be done based on the findings of the present study. It is, therefore, concluded that, while yield and maturity length are concerned, a trait-like number of filled grain per panicle should be given prime importance.

Knowledge Management: Journal