Optimum ploidy level for sugar beet yield is:
In sugar beet Beta vulgaris, yield comprises root biomass and sucrose percentage, traits influenced by cell size, leaf area, and breeding system efficiency. Diploid 2n=18, triploid 3n=27, and tetraploid 4n=36 have been evaluated extensively in European trials. Tetraploids display reduced fertility, irregular meiosis with quadrivalents, slower growth, and lower seed set, while diploids have normal fertility but smaller cells and less vigor. Triploid hybrid produced by crossing tetraploid female × diploid male combines benefits: increased cell volume and leaf vigor from polyploid gigas effect, i
Ref: Munerati et al. Sugar beet polyploid breeding; Bosemark NO. 1993 – Triploid optimum J Sugar Beet Res
