TERMINAL FLOWER1 is a breeding target for a novel everbearing trait and tailored flowering responses in cultivated strawberry (Fragaria x ananassa Duch.)

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Koskela , E A , Sonsteby , A , Flachowsky , H , Heide , O M , Hanke , M-V , Elomaa , P & Hytönen , T 2016 , ' TERMINAL FLOWER1 is a breeding target for a novel everbearing trait and tailored flowering responses in cultivated strawberry (Fragaria x ananassa Duch.) ' , Plant biotechnology journal , vol. 14 , no. 9 , pp. 1852-1861 . https://doi.org/10.1111/pbi.12545

Title: TERMINAL FLOWER1 is a breeding target for a novel everbearing trait and tailored flowering responses in cultivated strawberry (Fragaria x ananassa Duch.)
Author: Koskela, Elli Aurora; Sonsteby, Anita; Flachowsky, Henryk; Heide, Ola Mikal; Hanke, Magda-Viola; Elomaa, Paula; Hytönen, Timo
Contributor: University of Helsinki, Department of Agricultural Sciences
University of Helsinki, Department of Agricultural Sciences
University of Helsinki, Department of Agricultural Sciences
Date: 2016-09
Language: eng
Number of pages: 10
Belongs to series: Plant biotechnology journal
ISSN: 1467-7644
URI: http://hdl.handle.net/10138/176312
Abstract: The effects of daylength and temperature on flowering of the cultivated octoploid strawberry (Fragaria x ananassa Duch.) have been studied extensively at the physiological level, but information on the molecular pathways controlling flowering in the species is scarce. The flowering pathway has been studied at the molecular level in the diploid short-day woodland strawberry (F. vesca L.), in which the FLOWERING LOCUS T1 (FvFT1) SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (FvSOC1)-TERMINAL FLOWER1 (FvTFL1) pathway is essential for the correct timing of flowering. In this work, we show by transgenic approach that the silencing of the floral repressor FaTFL1 in the octoploid short-day cultivar 'Elsanta' is sufficient to induce perpetual flowering under long days without direct changes in vegetative reproduction. We also demonstrate that although the genes FaFT1 and FaSOC1 show similar expression patterns in different cultivars, the regulation of FaTFL1 varies widely from cultivar to cultivar and is correlated with floral induction, indicating that the transcription of FaTFL1 occurs at least partially independently of the FaFT1-FaSOC1 module. Our results indicate that changing the expression patterns of FaTFL1 through biotechnological or conventional breeding approaches could result in strawberries with specific flowering and runnering characteristics including new types of everbearing cultivars.
Subject: Fragaria
flowering
photoperiod
temperature
TERMINAL FLOWER1
VEGETATIVE GROWTH
TEMPERATURE
PHOTOPERIOD
GENES
VESCA
ARABIDOPSIS
EXPRESSION
TIME
HOMOLOG
APPLE
1183 Plant biology, microbiology, virology
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