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Genetic Variation in Root and Shoot Characters of Spring Wheat Under Well Watered Pot Condition

M. Khatoon
Department of Genetics and Plant Breeding Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

A. Islam
Department of Genetics and Plant Breeding, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted with 10 wheat genotypes grown under well watered pot condition during 1997-98. Root and shoot characters were recorded for estimation of genetic variation, heritability and genetic advance. Root length, root dry matter, shoot length and shoot dry matter showed significant variation among the genotypes. The presence of variability among genotypes for these characters and root-shoot ratio at different stage of plant growth was indicated by the wide ranges. Root and shoot growth was increased progressively with the advance of plant growth from 30-60 days after sowing. The genotype Aghrani recorded highest root dry weight followed by DSN-118, SAN-45 and SAN-90 at 60 days of plant growth. SAN-90 showed highest shoot dry matter production followed by DSN-118 at 60 days after sowing. The lowest root-shoot ratio of SAN-90 indicated its quicker growth of shoot than that of root. The heritability and genetic advance were gradually increased with the advance of plant growth for root and shoot characters. The high estimates of genetic parameters suggested additive gene effects on the genetic control of these characters.

Keywords: Wheat, Root-shoot ratio, Genetic variation, Heritability

Location: Department of Genetics and Plant Breeding, Bangladesh Agricultural University (BAU), Mymensingh

Start Date: 10-10-1997

End Date: 30-03-1998

Program Area: Variety and Species

Commodity: Wheat

Objectives:

To evaluate wheat varieties/lines for genetic variation, heritability and genetic advance of different root and shoot characters.

Methodology:

The experiment was conducted in pots in the net house at the field laboratory of the Department of Genetics and Plant Breeding, Bangladesh Agricultural University (BAU), Mymensingh, during the period from October 1997 to March 1998 under well watered condition. The experiment consisted to 10 wheat genotypes and was set up in two sets of plastic pots arranged in randomized block design. The under of replications was 3 for set I and 4 for set II. There were 180 pots for set I and 80 pots for set II. Each genotype was grown in 6 pots for set I and 2 pots for set II per replication. For data recording set I was used for destructive sampling and set II for non-destructive sampling. In this experiment 260 plastic pots having 20 em diameter and 20 em in depth were filled with a mixture of soil, cow dung and sand in the ratio of 2:1:1. Each pot contained 8 kg of such soil mixture. The following doses of fertilizers were added to the pot soil: Urea= 1312 mg, TSP = 800 mg, MP = 600 mg, Zypsum = 672 mg and Zinc sulphate = 72 mg. Total of TSP, MP and Zypsum and Zinc sulphate and halt of urea were applied at the pot soil preparation. All pots received the remaining halt of urea as top dressing in two equal installments, one at tillering and the other at booting stage. Well-filled seeds of 10 wheat genotypes were placed on moist filter papers in glass petridishes. Distilled water was applied as and when necessary. Seeds germinated 1 to 2 days after placing these on glass petridishes. The seeds of 4 days old were transplanted in the plastic pots. After establishment of seedlings one seedling was removed from each pot thus keeping two plant per pot. Water was applied to the pots when the soil looked gray white. The plants were washed carefully to clean the roots on individual pot basis. Root and shoots were then spreaded over in newspaper. Data on root length, root dry weight, shoot length and shoot dry weight were statistically analyzed to estimate mean square, co-efficient of variation, heritability and genetic advance. DMRT tests to compare the genotypic means tor these characters were also done. The mean squares from the analysis of variance were used to estimate genotypic and phenotypic variances according to Johnson et at. (1955).

Source of Information: Bangladesh J. Agril. Sci. 29(2): 251-257, July, 2002

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results of the present study shows that the root and shoot characters are highly heritable and controlled by additive genes. It can be suggested that further studies should include higher number of genotypes to asses the pattern of variation for root, shoot and yield characters under both pot and field condition to make any valid conclusion.

Knowledge Management: Journal