|1. Meiosis in male (A) and female (B).|
|2. Meiosis in male (A) and female (B) Caninae group roses.|
I came across this peculiar variant of meiosis while researching what complications might develop in a cross between Rosa pomifera (4n, group Caninae) and R. rugosa (2n). Both parent species have relatively large fruit. My initial plan was to hybridize the two species, generating at least one F1 plant, then allow them to self and screen many F2 progeny plants for increased fruit size.
That the two roses are not very closely related and both species have numerous smaller-fruited relatives suggests their large fruit was evolved separately. This is useful for a breeding project as it means that different mutations accumulated as each plant developed large fruit. Those separate mutations can possibly be recombined via hybridization to generate a progeny plant with even larger fruit.
I expect the project of domesticating roses as [more of] a fruit will take decades. It should be an amusing hobby and I expect to have enough time left to see some nice results.
- Meiosis: en.wikipedia.org/wiki/Meiosis
- Rose groups: en.wikipedia.org/wiki/List_of_Rosa_species
- Dog rose meiosis: