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Tomato floral induction and flower development are orchestrated by the interplay between gibberellin and two unrelated micro RNA ‐controlled modules
Summary Age‐regulated micro RNA 156 (miR156) and targets similarly control the competence to flower in diverse species. By contrast, the diterpene hormone gibberellin (GA) and the micro RNA 319‐regulated TEOSINTE BRANCHED / CYCLOIDEA / PCF ( TCP ) transcription factors promote flowering in the facul...
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Published in: | The New phytologist 2019-02, Vol.221 (3), p.1328-1344 |
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Main Authors: | , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Summary
Age‐regulated micro
RNA
156 (miR156) and targets similarly control the competence to flower in diverse species. By contrast, the diterpene hormone gibberellin (GA) and the micro
RNA
319‐regulated
TEOSINTE BRANCHED
/
CYCLOIDEA
/
PCF
(
TCP
) transcription factors promote flowering in the facultative long‐day
Arabidopsis thaliana
, but suppress it in the day‐neutral tomato (
Solanum lycopersicum
).
We combined genetic and molecular studies and described a new interplay between GA and two unrelated mi
RNA
‐associated pathways that modulates tomato transition to flowering.
Tomato
PROCERA
/
DELLA
activity is required to promote flowering along with the miR156‐targeted
SQUAMOSA PROMOTER BINDING
–
LIKE
(
SPL
/
SBP
) transcription factors by activating
SINGLE FLOWER TRUSS
(
SFT
) in the leaves and the
MADS
‐Box gene
APETALA
1
(
AP
1
)
/
MC
at the shoot apex. Conversely, miR319‐targeted
LANCEOLATE
represses floral transition by increasing
GA
concentrations and inactivating
SFT
in the leaves and
AP
1/
MC
at the shoot apex. Importantly, the combination of high
GA
concentrations/responses with the loss of
SPL
/
SPB
function impaired canonical meristem maturation and flower initiation in tomato.
Our results reveal a cooperative regulation of tomato floral induction and flower development, integrating age cues (miR156 module) with
GA
responses and miR319‐controlled pathways. Importantly, this study contributes to elucidate the mechanisms underlying the effects of
GA
in controlling flowering time in a day‐neutral species. |
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ISSN: | 0028-646X 1469-8137 |
DOI: | 10.1111/nph.15492 |