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Path Coefficient Analysis of Seven Characters in Cold-tolerant Rice (oryza Sativa L.)

Md. Enamul Haque
Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh.

A. Baset
Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh.

Z. Zeenat
Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh.

N. M. Miah
Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

Phenotypic and genotypic correlations and path coefficients were studied in seven characters including yield per plant for two indica and one japonica rice groups. In most of the cases, genotypic associations were higher than the phenotypic associations. Yield per plant was found highly and positively associated with plant height, growth duration and fertile grain per panicle. Modern varieties/lines had negative association between yield and panicle per plant. The traditional group showed no association except yield and 1000-grain weight showed negative relation. In path coefficient analysis, direct effects on yield were high for plant height, growth duration and fertile grain per panicle. The direct effects as well as correlation coefficients between 1000-grain weight and yield were negative for traditional varieties. Improvement of yield could be effective by direct selection for plant height, growth duration and fertile grain per panicle for modern and japonica groups and decreasing 1000-grain weight for traditional varieties. Direct effects did not fit always with the association because of the influence of indirect causal factors like panicle per plant. In such situations, causal factors should also be considered during selection.

Keywords: Path coefficient, Phenotypic and genotypic correlation, Cold tolerant rice

Location: BRRI experimental field, Gazipur

Start Date: 00-00-1987

End Date:

Program Area: Variety and Species

Commodity: Rice

Objectives:

To compare two indica and one japonica groups of rice varieties to identify the characters contributed to high yield for the development of modern varieties suitable for the Boro season in Bangladesh.

Methodology:

Twenty rice varieties from each of the traditional cold-tolerant indica, modern cold- tolerant indica and japonica groups were grown separately at BRRI experimental field in 1987 Boro season. Randomized complete block design was used with three replications. One month old seedlings from each entry were planted in a plot of 1.37m² with 25x15 crn spacing between rows and plants, respectively. Fertilizers were used at the rate of 60:40:40.kg NPK/ha. Total of P₂0₅ and K₂0 were used as basal and N was top dressed thrice at two weeks after transplanting, active tillering stage and at panicle initiation stage. Weeding was done twice during vegetative stages. Control measures for pests and diseases were not taken as no severe infestation was observed. The characters studied were seedling height, plant height, panicle number per plant, growth duration, fertile grain per panicle1000-grain weight and yield per plant. Data were collected from five plants from each plot. Phenotypic and genotypic correlation coefficients were measured and path coefficient analyses were done.

Source of Information: Bangladesh Rice J. 2(1&2): 1-7, 1991

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In most of the cases, genotypic associations were higher than the phenotypic associations. Yield per plant was found highly and positively associated with plant height, growth duration and fertile grain per panicle. Modern varieties/lines had negative association between yield and panicle per plant. The traditional group showed no association except yield and 1000-grain weight showed negative relation. In path coefficient analysis, direct effects on yield were high for plant height, growth duration and fertile grain per panicle. The direct effects as well as correlation coefficients between 1000-grain weight and yield were negative for traditional varieties. Improvement of yield could be effective by direct selection for plant height, growth duration and fertile grain per panicle for modern and japonica groups and decreasing 1000-grain weight for traditional varieties. Direct effects did not fit always with the association because of the influence of indirect causal factors like panicle per plant. In such situations, causal factors should also be considered during selection.

Knowledge Management: Journal