I have picked the sentence from a published paper "...In F1 generation, days to 1st flower was controlled by over dominance while in F2 it was inherited additively......." . The study involves a diallel among early and late flowering genotypes. Can the above sentence be substantiated? Or is there something wrong with the interpretation? The paper ends with " Hybrid vigour can be exploited in the case of traits controlled by complete dominance and over dominance while in cases additive control pedigree selection might be fruitful for improvement of the crop. ". Well, this is known. But what if F1 and F2 differ with respect to gene action? Am I missing something here?
(I have deliberately not mentioned the source of the paper but the abstract is available online)
Hello,
I hope the following information is helpful.
Genetic analysis of earliness in upland cotton Gossypium hirsutum L. I. Morphological and phenological variables
DOI: 10.1023 / A: 1003490016166
The GhACS1 gene encodes an acyl-CoA synthetase which is essential for normal microsporogenesis in early anther development of cotton https://doi.org/10.1111/j.1365-313X.2008.03700.x
A review of genetic mechanisms of early maturity in cotton (Gossypium hirsutum L.). https://doi.org/10.1007/s10681-020-02656-0
Regards
Thanks a ton Hermes Pérez-Hernández , It was a great response. I now have a couple of F2 populations where I am studying the genetic basis. One population has shown a 12:3:1 segregation for first flower. I am thinking of BSA next. Apart from earliness, we are also looking at plant type which if dwarf can be used for high density planting.
Segregation in F2 and back cross progenies can provide the gene action of a trait. It can further be validated through F3 materials. F1 can tell if the trait is governed by dominant and recessive gene(s).
Thanks Dr S. K. Chakrabarty , Well I needed some insight into the F2 and F3 gene action mentioned in my question above. Can it differ?
Dear sir
Above interpretation is just superficial. It's well known that F1 will have heterosis if trait in over dominance condition. But the condition of over dominance is a mere expression of heterozygosity. When it forwarded to next segregating generations, it's actual gene action can be estimated. It's also known that only additive part of variance inherit not dominance or over dominance. Hence, above interpretation looks correct.
With best regards
Thanks for your view Anilkumar C. I do appreciate your clarification on the F1 and F2 gene action. However, only if the ratio, root H/D is zero would it mean No dominance (could mean additivity!!). But a drastic shift in F2 still seems less probable. Unless, the trait in question would behave in a manner that is discussed in the paper.
The study should go beyond F2 and possibly Generations' studies would help get a proper understanding.
As for the paper from which the sentence was quoted, it is ok to limit the analysis to the findings. No issues there. Certainly, it has helped in this discussion !!
- Badges
- Science topic
- Similar topics
- Agricultural Science
- Agronomy
- Crop Science
- Crop