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Molecular basis of flowering under natural long-day conditions in Arabidopsis

ABSTRACT: Molecular basis of flowering under natural long-day conditions in Arabidopsis

PROVIDER: PRJNA434094 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6726400.fastq.gz	Fastqsanger.gz
	SRR6726410.fastq.gz	Fastqsanger.gz
	SRR6726420.fastq.gz	Fastqsanger.gz
	SRR6726430.fastq.gz	Fastqsanger.gz
	SRR6726440.fastq.gz	Fastqsanger.gz

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Molecular basis of flowering under natural long-day conditions in Arabidopsis

Project description:Plants sense light and temperature changes to regulate flowering time. The expression of the florigen gene, FLOWERING LOCUS T (FT), peaks in the morning during spring, a different pattern than we observe in the lab. Providing our lab growth conditions with a red/far-red light ratio similar to open field conditions and average natural temperature oscillation is sufficient to mimic the FT expression and flowering time in natural long days. Here, we use RNA-seq to identify and understand the molecular differences between natural growth conditions, conventional lab growth conditions, and supplemented lab growth conditions that mimic natural conditions. Non-NIH grant(s): Grant ID: NSF 1656076 Grant title: Exploring Seasonal Flowering Mechanisms Affiliation: University of Washington Name: Takato Imaizumi

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Molecular basis of flowering under natural long-day conditions in Arabidopsis.

Project description:Plants sense light and temperature changes to regulate flowering time. Here, we show that expression of the Arabidopsis florigen gene, FLOWERING LOCUS T (FT), peaks in the morning during spring, a different pattern than we observe in the laboratory. Providing our laboratory growth conditions with a red/far-red light ratio similar to open-field conditions and daily temperature oscillation is sufficient to mimic the FT expression and flowering time in natural long days. Under the adjusted growth conditions, key light signalling components, such as phytochrome A and EARLY FLOWERING 3, play important roles in morning FT expression. These conditions stabilize CONSTANS protein, a major FT activator, in the morning, which is probably a critical mechanism for photoperiodic flowering in nature. Refining the parameters of our standard growth conditions to more precisely mimic plant responses in nature can provide a powerful method for improving our understanding of seasonal response.

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Project description:Plants of three different genotypes (FRI FLC, FRI flc and fri flc) were induced to flowering by shifting from short day conditions to long day conditions. FRI=FRIGIDA, FLC=FLOWERING LOCUS C.

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Project description:Flowering time is one of important agronomic traits determining the crop yield and affected by high temperature. When facing high ambient temperature, plants often initiate early flowering as an adaptive strategy to escape the stress and ensure successful reproduction. However, here we find opposing ways in the short-day crop soybean to respond to different levels of high temperatures, in which flowering accelerates when temperature changes from 25 to 30 °C, but delays when temperature reaches 35 °C under short day. phyA-E1, possibly photoperiodic pathway, is crucial for 35 °C-mediated late flowering, however, does not contribute to promoting flowering at 30 °C. 30 °C-induced up-regulation of FT2a and FT5a leads to early flowering, independent of E1. Therefore, distinct responsive mechanisms are adopted by soybean when facing different levels of high temperatures for successful flowering and reproduction.

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Project description:We show that in Arabidopsis SIN3 LIKE (SNL)family genes encoding a scoffold protein for assembly of histone deacetylase complex, directly regulate the expression of an FT activator and three FT repressors to regulate the transition to flowering in short days and long days, respectively. Under inductive long days, SNLs including SIN3 LIKE 1(SNL1) to SNL5, function in partial redundancy to repress the expression of three AP2 family transcription factors that repress FT expression, and thus mediate long-day induction of FT expression and promote the transitiion to flowering. In contrast, under non-inductive short days SNLs act to inhibit the floral transition, partly through direct repression of a MADS box transcriptional factor that promotes FT expression. Thus, our results reveal that SNLs, through histone deacetylation, play a novel dual role for the control of flowering in the long-day plant Arabidopsis: inhibiting flowering when the day length is shorter and promoting the floral transition when days become longer than a threshold length.

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