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Study of Genetic Advance in M4 Mutants Rice (oryza Sativa L.)var. Nizersail.

Mostafizur Rahman
Institute of Nuclear Agriculture, P. O. Bolt 4, Mymensingh,

A. J. Miah
Institute of Nuclear Agriculture, P. O. Bolt 4, Mymensingh,

Abstract/ Executive Summary:

Studies were made on heritability, genetic advance and genetic coefficient of variation for heading time, plant height, panicle number, panicle length, 100 grain weight, spikelet fertility and grain yield in 16 early maturing mutants of rice var. Nizersail in M₄ generation. The data indicated that percent heritability, genetic advance and coefficient of genetic variation were considerably high (or heading time and plant height suggesting the possibilities of improvement of these two characters through selection. The heritability estimates for panicle number and grain yield per plant were the lowest among all the characters studied indicating that environmental influence on these two characters was quite high. It is therefore apparent that the scope for improving these two characters through selection is less in the present materials.

Keywords: Nizersail, heritability, genetic advance and Panicle number

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Start Date:

End Date:

Program Area: Variety and Species

Commodity:

Objectives:

The present study was undertaken to determine the magnitude of heritability estimates for a number of quantitative characters of some induced mutants rice in M₄ generation.

Methodology:

M4- seeds collected from 16 M₃ early maturing mutants of rice var. Nizersail constituted the materials of the present study. The seeds were sown during the Aman season of 1976. After 30 days, the seedlings were transplanted in the field in randomized block design with 3 replications. Each of the mutant lines was grown in a 2.75 m x 0.9 m plot with 4 rows having 12 plants in each row. Each of the 20 plants harvested from the two middle rows was studied for heading time, plant height, panicle number, panicle length, spikelet fertility, 100 grain weight and grain yield. Heritability in 'broad sense', genetic advance under selection, and genetic coefficient of variation were estimated

Source of Information: Bangladesh J. Agril. sci. 7 (2): 113-116: 1980

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Achievement/Findings:

Genotypic variance was much lower than phenotypic variance for panicle number. Heritability for this. trait Was lowest (43.4%) indicating little scope of improvement of this character through selection. Grain yield, however, showed greater heritability than the panicle number. This indicated that there is some Scope for further improvement of grain yield through selection. Heritability values were moderately high for panicle length, spikelet fertility and 100 grain weight. It, therefore, seems that selection would be effective for these characters although the scope of selection will be limited as is evidenced from the low genetic coefficients of variation (or these characters.The results obtained in this investigation reveal that in the expression of most of the characters studied the proportion of genetic contribution was more than that of the environment indicating possibilities of improvement of these traits through seletion in the sub- sequent generation.

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