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ON THE THEORIES OF HYBRID VIGOUR Review Article | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 37, Issue 2, 2006, Pages 69-74 | ||
| Author | ||
| M. M. Elsahookie | ||
| Abstract | ||
| Several theories and results of many researchers worked on hybrid vigour in crop plants were reviewed and discussed .It was concluded that hybrid vigour is a quantitative complex syndrome resulting via different gene action of many gene pairs. It was also concluded that hybrid vigour is seldom to be due to one case of gene action. So, it is most likely to come out by three cases of gene actions act together at the same time: 1. Codominance effects of some major favourable allelic genes (on some chromosomes) cause genes to complement each other (intra- genie interaction) to show the vigour of traits in the hybrid. 2. Coepistasis and semiepistasis effects of some major favourable nonallelic genes (on same or another chromosome) cause genes to complement each other (inter- genie interaction) to show the vigour of traits in the hybrid. 1. 3. Partial dominance and dominance effects of many genes act to cover the negative effects of deleterious genes. Additive gene action might be involved too. Masking the effects of deleterious genes is most likely to take place in each hybrid resulting from crossing inbreds. However, this case is seldom to be as the major reason of hybrid vigour. | ||
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