Abstract:
:The BEL1-like family of transcription factors is ubiquitous in plants and plays important roles in regulating development. They function in tandem with KNOTTED1 types to bind to a double TTGAC motif in the upstream sequence of target genes. StBEL5 of potato (Solanum tuberosum) functions as a mobile RNA signal that is transcribed in leaves, moves down into stolons in response to short days, and induces tuber formation. Despite their importance, however, very little is known about the targets of BEL1-like transcription factors. To better understand this network, we made use of a phloem-mobile BEL5 induction model, an ethanol-inducible system coupled with RNA sequencing analysis, and a screen for tandem TTGAC cis-elements in the upstream sequence to catalog StBEL5 target genes. Induction of StBEL5 activated several genes that are also induced by StSP6A (S. tuberosum SELF-PRUNING 6A), a FLOWERING LOCUS T coregulator that functions as a signal for tuberization. Both enhancement and suppression of StBEL5 expression were also closely linked to StSP6A transcriptional activity. Site mutagenesis in tandem TTGAC motifs located in the upstream sequence of StSP6A suppressed the short day-induced activity of its promoter in both young tubers and leaves. The expression profile of StBEL5 induced in stolons from plants grown under long-day conditions revealed almost 10,000 differentially expressed genes, including important tuber marker genes and genes involved in cell growth, transcription, floral development, and hormone metabolism. In a random screen of 200 differentially expressed targets of StBEL5, 92% contained tandem TTGAC motifs in the upstream sequence within 3 kb of the transcription start site.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Sharma P,Lin T,Hannapel DJdoi
10.1104/pp.15.01314subject
Has Abstractpub_date
2016-01-01 00:00:00pages
310-24issue
1eissn
0032-0889issn
1532-2548pii
pp.15.01314journal_volume
170pub_type
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