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Inheritance of Culm Length in Crosses Involving Bangladesi Varieties and Grass Dwarf Selected Lines of Wheat

Md. Sanaullah
Institute of Biological Sciences, University of Rajshahi, Rajshahi-6205

G. Kabir
Institute of Biological Sciences, University of Rajshahi, Rajshahi-6205

Abstract/ Executive Summary:

Inheritance of culm length was studied in seven crosses of wheat using parents. F_1^, F_2^, B₁ and B₂ progenies. Mean values of segregating generations were within their respective parental ranges. Theoretical means of F1s were found to deviate significantly in three out of seven crosses. Both additive and non-additive gene action were detected in almost all the crosses. This study Indicated the Involvement of at least one gene or gene group to control this character and partial dominance of genes governing tallness. Frequency distribution of F₂ culm length of all the crosses Involving FM-32 did not fit the normal curves. While, crosses with FM-139 almost approached to normality both broad and narrow sense heritability were high in all the crosses.

Keywords: Inheritance, Culm length, Wheat

Location: Regional Agriculture Research Station, Ishurdl, Bangladesh

Start Date: 00-00-1990

End Date: 00-00-1991

Program Area: Variety and Species

Commodity: Wheat

Objectives:

To study the mode of inheritance of culm length in crosses involving four Bangladeshi varieties and two grass dwarf selected lines of wheat.

Methodology:

The materials used in the present study were four Bangladeshi varieties namely, Akbar, Ananda. Aghrani and Kanchan and two grass dwarf lines of wheat viz, FM-32 and FM-139. Bangladeshi varieties were collected from the Regional Agriculture Research Station, Ishurdl, Bangladesh. Grass dwarf lines were procured from the Department of Agricultural and Environmental Sciences University of Newcastle Upon Tyne. United Kingdom. F₁, F₂, B₁ and B₂ progenies of the crosses between Bangladeshi varieties and grass dwarf selected lines were also used in this experiment. The plants were grown in the experimental field of Rajshahl University, during 1990-91 following Randomized Complete Block Design (RCB) with three replications and providing 30 cm space between rows and 10 cm between plants. The P1, P2 and F1 had a single row each, B1 and B2s had two rows, but three rows for each of F2 population. Mature culm lengths were measured in cm from the crown to the base of the tallest culm of each plant. Observed and theoretical frequency distribution for culm length were calculated and tested for normality according to Pearson's x2 test described. The type of gene action involved in the inheritance of plant height and theoretical means corresponding to additive and non additive gene action were computed. The differences between observed and theoretical means (arithmetic and geometric) were tested by 't' and 'd' test. The minimum number of genes controlling the expression of culm length was calculated. Both broad and narrow sense heritability was estimated and the average degree of dominance was determined by dominance ratio method.

Source of Information: Journal of the Asiatic Sociaty of Bangladesh Science 22 (1): 5-31. 1996, ISSN 1016-6974

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results obtained in the present study also agreed with the results reported earlier. For culm length of F2 plants from wheat crosses of normal x semi dwarf cultivars, abnormal frequency distributions and high heritability percentages. From F2 frequency distributions of the crosses involving Larker and the dwarf or semidwarf parents of barley, Indicated that the major genes for plant height were acting in a recessive manner. The frequency distribution of the progenies for culm length in present study gave an indication of the genetic variability in parents of different crosses. The observed frequency distribution pattern of F2 population deviated significantly from the theoretical distribution. The highly significant deviation was obtained in Kan x FM-32, x2 = 53.78). All the above significantly deviated frequency distribution failed to correspond to normal distributions. Nature of the F2 distributions also clearly showed apparent dissimilarities with normality and did not fit a normal curve.

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