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Forskningsartikel2012Vetenskapligt granskadÖppen tillgång

The Role of a Pseudo-Response Regulator Gene in Life Cycle Adaptation and Domestication of Beet

Pin, Pierre A.; Zhang, Wenying; Vogt, Sebastian H.; Dally, Nadine; Buettner, Bianca; Schulze-Buxloh, Gretel; Jelly, Noemie S.; Chia, Tansy Y. P.; Mutasa-Goettgens, Effie S.; Dohm, Juliane C.; Himmelbauer, Heinz; Weisshaar, Bernd; Kraus, Josef; Gielen, Jan J. L.; Lommel, Murielle; Weyens, Guy; Wahl, Bettina; Schechert, Axel; Nilsson, Ove; Jung, Christian;
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Sammanfattning

Life cycle adaptation to latitudinal and seasonal variation in photoperiod and temperature is a major determinant of evolutionary success in flowering plants. Whereas the life cycle of the dicotyledonous model species Arabidopsis thaliana is controlled by two epistatic genes, FLOWERING LOCUS C and FRIGIDA [1-3], three unrelated loci (VERNALIZATION 1-3) determine the spring and winter habits of monocotyledonous plants such as temperate cereals [4-6]. In the core eudicot species Beta vulgaris, whose lineage diverged from that leading to Arabidopsis shortly after the monocot-dicot split 140 million years ago [7, 8], the bolting locus B [9] is a master switch distinguishing annuals from biennials. Here, we isolated B and show that the pseudo-response regulator gene BOLTING TIME CONTROL 1 (BvBTC1), through regulation of the FLOWERING LOCUS T genes [10], is absolutely necessary for flowering and mediates the response to both long days and vernalization. Our results suggest that domestication of beets involved the selection of a rare partial loss-of-function BvBTC1 allele that imparts reduced sensitivity to photoperiod that is restored by vernalization, thus conferring bienniality, and illustrate how evolutionary plasticity at a key regulatory point can enable new life cycle strategies.

Publicerad i

Current Biology
2012, Volym: 22, nummer: 12, sidor: 1095-1101
Utgivare: CELL PRESS