Does anyone think it is valid or justifiable to evaluate the germ plasma lines/advanced lines in vegetatively propagated crops in terms of heritability after clonal selection?
Thank you, but in this case genotypic variability does not change as one not going for seed to seed, so would you agree/
In clonally propagated crops, we assume characters will transfer en-mass to its offsprings. But there might be a chance to get a clonal mutant, which without evaluation, couldnot be found.
I dont think it is relevant for vegetatively propagated crops to work out heritability.
I would like, some day, to research about genetic memory, epigentics, in rooted cuttings plants. The idea is submit the cuttings donor to a stress and evaluate the offspring. We need to grow a donor without any event of this stress in it whole life to have a good control.
If you see any idea like this let me know.
Dear James, I liked your idea.If it is a open pollinated crop pl collect seeds and subject them to intermittent stress in nursery and select the best ones tolerant to stress and then go for clonal multiplication after planting them in field.If u like, I have one paper in mulberry that I will forward it.
yes, It is a similar idea. I was thinking just in fruit trees at the beginning. You can post the paper here in the discussion. It would be great.
Dear Prakash G!
I would suffix Maggie's answer in slightly different way. As she said that the only differences one would expect among clones would be genetic and environmental. Therefore, the term used is Repeatability for consistency of performance of clones across different growing generations. This repeatability gives us the upper bounds of heritability.
So what would we be interested in to find repeatability? Clones with high repeatability would mean that we can rely on their future performance on past records (values) of the clones.
Hope it relates to your question.
If I understand correctly, you have a set of different genotypes that have been the product of a breeding program. I agree estimating heritability may not be the right question. Depending on the triat(s) you are interested in, a question that may be better would be to calculate general and specific combining ability for the different clones in a series of crosses. That would give you information if general or specific combining ability controls your trait and then how you can best move forward as a breeder. If general combining ability explains most of the variation that is great. It basically means there is some good predictability. Parents with a strong degree of a particular trait tend to transmit it to their offspring. If specific combining ability explains the variation better, then there is a lot less predictability and you just have to make a lot of crosses and find those special combos the tend to give you offspring with the desired trait.
There are multiple papers out there you can use as a model in horticultural crops looking at calculating combining ability.
In selection of Clonal Crops, what should we emphasize? High or low heritability?
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