Details

Autor(en) / Beteiligte

• Teo, Chin-Jit
• Takahashi, Kenta
• Shimizu, Kanae
• Shimamoto, Ko
• Taoka, Ken-Ichiro

Titel

Potato Tuber Induction is Regulated by Interactions Between Components of a Tuberigen Complex

Ist Teil von

• Plant and cell physiology, 2017-02, Vol.58 (2), p.365-374

Ort / Verlag

Japan

Erscheinungsjahr

2017

Quelle

MEDLINE

Beschreibungen/Notizen

• Photoperiod-regulated flowering and potato tuber formation involve leaf-produced mobile signals, florigen and tuberigen, respectively. The major protein component of florigen has been identified as the FLOWERING LOCUS T (FT) protein. In rice, an FT-like protein, Heading date 3a (Hd3a), induces flowering by making the florigen activation complex (FAC) through interactions with 14-3-3 and OsFD1, a rice FD-like protein. In potato, StSP6A, an FT-like protein, was identified as a major component of tuberigen. However, the molecular mechanism of how StSP6A triggers tuber formation remains elusive. Here we analyzed the significance of the formation of a complex including StSP6A, 14-3-3 and FD-like proteins in tuberization. Yeast two-hybrid, bimolecular fluorescence complementation and in vitro pull-down assays showed that StSP6A and StFDL1, a potato FD-like protein, interact with St14-3-3s. StSP6A overexpression induced early tuberization in a 14-3-3-dependent manner, and suppression of StFDL1 delayed tuberization. These results strongly suggest that an FAC-like complex, the tuberigen activation complex (TAC), comprised of StSP6A, St14-3-3s and StFDL1, regulates potato tuber formation.