Indian Society of Genetics & Plant Breeding
The present investigation was conducted with the main
objective of studying the extent of genetic variability
released through recombination, induced mutation and
their combination for yield and its attributing traits in
tetraploid wheat. The material consisted of segregating
populations (F2, M2 and F2M2) developed from Triticum
dicoccum wheat variety DDK1025 and T. durum wheat
variety HD4502 after subjecting to EMS and γ -rays treatment.
Among mutagen treated populations γ -rays induced more
reduction in germination and survival percentage and mean
plant height than EMS. Analysis of variance revealed highly
significant differences among the populations for all the
characters studied. An upper limit of range was more in M2
compared to F2 and F2M2 populations for all the characters
except for days to 50% flowering and number of productive
tillers/ plant. In general, the γ -rays irradiated populations
recorded highest PCV and GCV for all the characters except
for plant height, spike length and spikelets/spike indicating
greater scope for selection and improvement of these
characters in desired direction. Most of the characters
exhibited high heritability except spike length in all
segregating populations. In general, the number of favorable
correlations and higher strength of positive correlations
were appeared to be more in F2M2 populations than both F2
and M2 populations. The number of potential genotypes
varied considerably across the traits and the populations.
The F2M2 (γ ) population showed higher number of potential
progeny lines compared to F2, F2M2 (EMS) and M2
populations.This indicated greater possibility of generation
of potential genotypes through irradiation in heterozygous
condition than EMS.
Keywords: Induced mutation, recombination, genetic variability, favorable correlations, selection
Year: 2013
Volume: 73
Issue: 3
Article DOI: 10.5958/j.0975-6906.73.3.037
Print ISSN: 0019-5200
Online ISSN: 0975-6906
Shobha Laxani, S. A. Desai info_circle
H. C. Lohithaswa info_circle
R. R. Hanchinal info_circle
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