A genetic parameter characterized by the presence of diploid (2n=14) and tetraploid (2n=28) forms, which determines morphological traits, productivity, and the crop's cultivation requirements.
In the reference
49
varieties
crop Rye,
where this is mentioned in the description.
Diploid rye is the natural form of the species with a set of 2n=14, whereas the tetraploid form (2n=28) was obtained through autopolyploidy. Tetraploid varieties produce larger grain with a thousand-kernel weight of 40–55 g compared to 25–35 g in diploids and are distinguished by increased straw resistance to lodging.
Tetraploids are more demanding regarding soil fertility and moisture availability; therefore, diploid varieties are preferable on poor soils. Tetraploid forms have 10–15% lower ear grain set and are more susceptible to ergot infection. Due to the extremely low crossability between diploids and tetraploids, strict spatial isolation is mandatory during seed production.
General information about the subject — on the page
Ploidy.
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.