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
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Creator |
Laxani.Shobha
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Contributor |
S.A.Desai
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Subject |
Genetics and Plant Breeding
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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. |
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Date |
2016-10-27T15:47:23Z
2016-10-27T15:47:23Z 2008 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/82584
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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