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Investigations on effect of physical and chemical mutagens on tetraploid wheat

KrishiKosh

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Title Investigations on effect of physical and chemical mutagens on tetraploid wheat
 
Creator Laxani.Shobha
 
Contributor S.A.Desai
 
Subject Genetics and Plant Breeding
 
Description An investigation was carried out in two generations. First generation during kharif
2007 at IARI, RRS, Wellington, Tamil Nadu to assess the germination and survival
percentage and mean plant height of M1, F1 and M1F1 populations. Second generation carried
out during rabi 2007-08 at Wheat Improvement Project fields, UAS, Dharwad to assess the
extent of genetic variability released by hybridization, mutagenesis, hybridization followed
by mutagenesis. One cross, DDK1025 x HD4502 was used to generate F2 and F2M2
generations and also M2’s of DDK1025 and HD4502. The seven segregating populations
were evaluated for eight quantitative traits including seed yield.
In first generation g-ray induced more reduction in germination and survival
percentage and mean plant height than EMS treated and control population. In second
generation most of the characters exhibited positive shift in mean for M2 population than F2
and F2M2 populations. Wide range was observed in M2 populations in comparison to F2 and
F2M2 populations.
The irradiated populations revealed the highest PCV and GCV for all characters
except for PH, SL and SPS. Except SL all characters exhibited high heritability value. All
populations showed high GAM for TGW and YPP.
Highly significant positive correlation of NPTP with YPP for DDK1025 M2 (g)
population and SL with YPP for DDK1025 x HD4502 (CF2) population was observed. The
association pattern has been changed from F2 to F2M2 either on favourable side or on
unfavourable side. More number of favourable correlation were observed in F2M2 (EMS)
populations. Path analysis revealed DFF, NPTP, SL and SPS had high direct effect on grain
yield in almost all populations.
More number of potential genotypes were recorded in F2M2 (g) population compared
to their corresponding F2’s and F2M2 (EMS). It was observed that effectiveness of physical
mutagen in creating potential genotypes were more than the chemical mutagen.
 
Date 2016-10-27T15:47:23Z
2016-10-27T15:47:23Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/82584
 
Format application/pdf
 
Publisher UAS, Dharwad