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A PHOT2-NPH3-CAMTA2 light-temperature coincidence detection system in Arabidopsis II

ABSTRACT: Light and temperature variations are inescapable in nature, providing many types of information and influencing development and physiology. PHOTOTROPIN (PHOT) blue light receptor-kinases play well-characterized roles in multiple processes in short time scales, but functions over days, weeks, or seasons have rarely been explored. Here we show that PHOT2 integrates blue light and low temperature signals to control leaf number at flowering. Plants lacking PHOT2 show delayed flowering, specifically when grown in low temperature. This effect is blocked by loss of NON-PHOTOTROPIC HYPOCOTYL 3 (NPH3), and can be phenocopied by reduced blue light intensity, and by removal of CAMTA2. PHOT2 and CAMTA2 show non-additive genetic interactions, and a deep RNA-sequencing time course reveals highly overlapping phot2- and camta2-dependent effects on gene expression patterns across the day. Network-based co-expression analysis indicates system-level up-regulation of key growth modules in phot2 and camta2 mutants. Temperature- and genotype-dependent modulation of florigen-anti-florigen balance in phot2 and camta2 mutants is consistent with the phenotype. Together these data establish PHOT2 and NPH3 as a light-temperature coincidence detection module, operating with CAMTA2 as a downstream or parallel regulator of PHOT2-dependent gene expression.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE240117 | GEO | 2025/07/04

REPOSITORIES: GEO

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A PHOT2-NPH3-CAMTA2 light-temperature coincidence detection system in Arabidopsis I

Project description:Light and temperature variations are inescapable in nature, providing many types of information and influencing development and physiology. PHOTOTROPIN (PHOT) blue light receptor-kinases play well-characterized roles in multiple processes in short time scales, but functions over days, weeks, or seasons have rarely been explored. Here we show that PHOT2 integrates blue light and low temperature signals to control leaf number at flowering. Plants lacking PHOT2 show delayed flowering, specifically when grown in low temperature. This effect is blocked by loss of NON-PHOTOTROPIC HYPOCOTYL 3 (NPH3), and can be phenocopied by reduced blue light intensity, and by removal of CAMTA2. PHOT2 and CAMTA2 show non-additive genetic interactions, and a deep RNA-sequencing time course reveals highly overlapping phot2- and camta2-dependent effects on gene expression patterns across the day. Network-based co-expression analysis indicates system-level up-regulation of key growth modules in phot2 and camta2 mutants. Temperature- and genotype-dependent modulation of florigen-anti-florigen balance in phot2 and camta2 mutants is consistent with the phenotype. Together these data establish PHOT2 and NPH3 as a light-temperature coincidence detection module, operating with CAMTA2 as a downstream or parallel regulator of PHOT2-dependent gene expression.

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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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A PHOT2-NPH3-CAMTA2 light-temperature coincidence detection system in Arabidopsis I

Project description:A PHOT2-NPH3-CAMTA2 light-temperature coincidence detection system in Arabidopsis I

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A PHOT2-NPH3-CAMTA2 light-temperature coincidence detection system in Arabidopsis II

Project description:A PHOT2-NPH3-CAMTA2 light-temperature coincidence detection system in Arabidopsis II

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Light activation of the sigmaB-mediated general stress-response of Bacillus subtilis

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Florigen Accelerates Secondary Cell Wall Biogenesis to Harmonize Vascular Maturation with flowering and reproductive phase Development

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Light activation of the sigmaB-mediated general stress-response of Bacillus subtilis

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PFT1, the MED25 subunit of the plant Mediator complex, promotes flowering through CONSTANS dependent and independent mechanisms in Arabidopsis

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