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Sugar beet ( Beta vulgaris  ssp. vulgaris) is a biennial, sucrose-storing plant, which is mainly cultivated as a spring crop and harvested in the vegetative stage before winter. For increasing beet yield, over-winter cultivation would be advantageous. However, bolting is induced after winter and drastically reduces yield. Thus, post-winter bolting control is essential for winter beet cultivation. To identify genetic factors controlling bolting after winter, a F 2  population was previously developed by crossing the sugar beet accessions BETA 1773 with reduced bolting tendency and 93161P with complete bolting after winter. For a mapping-by-sequencing analysis, pools of 26 bolting-resistant and 297 bolting F 2  plants were used. Thereby, a single continuous homozygous region of 103 kb was co-localized to the previously published  BR  1  QTL for post-winter bolting resistance (Pfeiffer et al.,  2014 ). The  BR  1  locus was narrowed down to 11 candidate genes from which a homolog of the  Arabidopsis CLEAVAGE AND POLYADENYLATION SPECIFICITY FACTOR 73-I  ( CPSF73-I ) was identified as the most promising candidate. A 2 bp deletion within the BETA 1773 allele of  BvCPSF73-Ia  results in a truncated protein. However, the null allele of  BvCPSF73-Ia  might partially be compensated by a second  BvCPSF73-Ib  gene. This gene is located 954 bp upstream of  BvCPSF73-Ia  and could be responsible for the incomplete penetrance of the post-winter bolting resistance allele of BETA 1773. This result is an important milestone for breeding winter beets with complete bolting resistance after winter.

A Detailed Analysis of the BR1 Locus Suggests a New Mechanism for Bolting after Winter in Sugar Beet (Beta vulgaris L.)