| Results and Discussion Grain Protein Content Percentage The results (Table 1) reveal that the spring wheat parents did not survive in autumn sowing. Increased grain protein percentage was noted in winter wheat parents, but line F21-76 was superior than line F310-C3-4 in both the seasons. The mean values of F1 generations showed a partial dominance to the low grain protein content. The high values of protein percentage in spring sowing in comparison to winter sowing, are probably due to incomplete development of seeds caused by less period of standing crop. The differences between all the reciprocal crosses except F310-C3-4 x Pad-70 were small and non-significant. This proves that there is no practical importance in reciprocal crossing for determination of grain protein content. It is concluded that two genetically different germplasms used in these crosses did not express at cytoplasmic level. The great difference among the mean values of hybrids of two different sowing times displayed that genotype x environment interactions played a major role in the expression of grain protein content. The environmental factors modify the behaviour of the parents and of the F1 and F2 generations. A great variation of F1 populations in comparison to parents and F1 populations, indicate the existance of a number of important genetic components which control the grain protein percentage in common wheat. Normal frequency distribution in F2 populations suggests a complex genetic control of protein percentage in wheat. The heritability and genetic advance values (Table 3) for this trait under two sets of environmental conditions are considerably high in F2 populations. This suggests that F2 populations contain a large genetical variability and one could expect a potential gain to be achieved through selection in F2 populations. These results are in confirmation with JOHNSON et al. (1972) and SOOMRO & LARIK (1981). |
| <-- Back | | | --> Next |