Estimation of General Combining Ability for Parents and Specific for Single Hybrids and Correlation Coefficient for Studied Characters of Maize using Simmonds Method
AbstractEight inbred lines of maize (1. Inb–6, 2. Pio – 17, 3. Syn– 9, and 4. Zm–17) as female and lines (5. Pio–3, 6. S–10, 7. MGW–1 and 8. Ast–B) as male parents were entered in program for hybridization in factorial mating system to produce 16 single cross in field crops Research station of general Board of Agricultural Research- Abu – Ghraib.Seeds of gene types (4Femal + 4Male + 16 Cross) have been planted in field of a farmer in Kut, using randomized complete block design R.C.B.D. with three replicates in fall season 2015 to estimate general and specific combining ability and their effects and correlation coefficient between observed and expected values for each trait, using (22) methods for factorial analysis, The results revealed that there were significant differences for mean squares of genotypes for all studied traits The hybrid 3*5 gave mean highest for ear length 20.42 cm, number of grains per row 35.75 and for grain yield per plant 381.24gm. Results of genetic analysis showed that the variance of the SCA was more than the variance of the GCA for ear length 0.668, number of rows per ear 0.628, number of grains per row 0.738, ear diameter 0.631 and for grain yield per plant 0.570. The effects of GCA for the females and males parents were positive and negative for cross in all traits. The line 2 found effect highest GCA for ear length 0.871, ear diameter 1.409, number of ears per plant 0.152 and for grain yield per plant 43.271, and ear length 0.769, number of rows per ear 0.731, number of grains per row 2.276, 250 grain weight 13.770, and for grain yield per plant 25.017. In addition, the SCA effects for crosses were positive and negative for all the cross in all studied traits, the single cross hybrid 3*8 was the effect highest of SCA for ear length 2.826, number of grains per row 6.011, and for grain yield per plant 90.513. The correlation coefficient between the observed values and expected values for each trait was high for all studied traits.
- Combining Ability --- Parents --- Specific --- Single Hybrids --- Correlation Coefficient --- Maize --- Simmonds Method
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