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Role of Arabidopsis Splicing factor SF1 in Temperature-Responsive Alternative Splicing of FLM pre-mRNA

Authors
Lee, Keh ChienChung, Kyung SookLee, Hee TaePark, Jae-HyeokLee, Jeong HwanKim, Jeong-Kook
Issue Date
1-12월-2020
Publisher
FRONTIERS MEDIA SA
Keywords
alternative splicing; ambient temperature; Arabidopsis thaliana; AtSF1; FLM; FLM-& #946; FLM-& #948; temperature-responsive flowering
Citation
FRONTIERS IN PLANT SCIENCE, v.11
Indexed
SCIE
SCOPUS
Journal Title
FRONTIERS IN PLANT SCIENCE
Volume
11
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/50863
DOI
10.3389/fpls.2020.596354
ISSN
1664-462X
Abstract
Small changes in temperature affect plant ecological and physiological factors that impact agricultural production. Hence, understanding how temperature affects flowering is crucial for decreasing the effects of climate change on crop yields. Recent reports have shown that FLM-beta, the major spliced isoform of FLOWERING LOCUS M (FLM)-a flowering time gene, contributes to temperature-responsive flowering in Arabidopsis thaliana. However, the molecular mechanism linking pre-mRNA processing and temperature-responsive flowering is not well understood. Genetic and molecular analyses identified the role of an Arabidopsis splicing factor SF1 homolog, AtSF1, in regulating temperature-responsive flowering. The loss-of-function AtSF1 mutant shows temperature insensitivity at different temperatures and very low levels of FLM-beta transcript, but a significantly increased transcript level of the alternative splicing (AS) isoform, FLM-delta. An RNA immunoprecipitation (RIP) assay revealed that AtSF1 is responsible for ambient temperature-dependent AS of FLM pre-mRNA, resulting in the temperature-dependent production of functional FLM-beta transcripts. Moreover, alterations in other splicing factors such as ABA HYPERSENSITIVE1/CBP80 (ABH1/CBP80) and STABILIZED1 (STA1) did not impact the FLM-beta/FLM-delta ratio at different temperatures. Taken together, our data suggest that a temperature-dependent interaction between AtSF1 and FLM pre-mRNA controls flowering time in response to temperature fluctuations.
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