Integration of light signaling with photoperiodic flowering and circadian rhythm

GIGANTEA (GI) is a gene involved in multiple biological functions, which were analysed and are partially conserved in a series of mono- and dicotyledonous plant species. The identified biological functions include control over the circadian rhythm, light signalling, cold tolerance, hormone signalling and photoperiodic flowering. The latter function is a central role of GI, as it involves a multitude of pathways, both dependent and independent of the gene CONSTANS(CO) as well as on the basis of interaction with miRNA. The complexity of gene function of GI increases due to the existence of paralogs showing changes in genome structure as well as incidences of sub- and neofunctionalization. We present an updated report of the biological function of GI, integrating late insights into its role in floral initiation, flower development and flower volatile production.

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A point mutation in Phytochromobilin Synthase alters the circadian clock and photoperiodic flowering of Medicago truncatula

10.22541/au.163256414.46229651/v1 ◽

2021 ◽

Author(s):

Soledad Perez Santangelo ◽

Nathanael Napier ◽

Fran Robson ◽

James Weller ◽

Donna Bond ◽

...

Keyword(s):

Circadian Clock ◽

Medicago Truncatula ◽

Clock Genes ◽

Light Signaling ◽

Circadian Period ◽

Crop Species ◽

Light Sensing ◽

Tilling Population ◽

Photoperiodic Flowering ◽

Time Of Year

Plants use seasonal cues to initiate flowering at an appropriate time of year to ensure optimal reproductive success. The circadian clock integrates these daily and seasonal cues with internal cues to initiate flowering. The molecular pathways that control the sensitivity of flowering to photoperiod (daylength) are well described in the model plant Arabidopsis. However, much less is known in crop species, such as the legume family species. Here we performed a flowering time screen of a TILLING population of Medicago truncatula and found a line with late-flowering and altered light-sensing phenotypes. Using RNA-sequencing, we identified a nonsense mutation in the Phytochromobilin Synthase (MtPΦBS) gene, which encodes an enzyme that carries out the final step in the biosynthesis of the chromophore required for phytochrome (PHY) activity. The analysis of the circadian clock in the MtpΦbs mutant revealed a shorter circadian period, which was shared with the phyA mutant. The MtpΦbs and MtphyA mutants showed downregulation of FT floral regulators MtFTa1, MtFTb1/b2 and a shift in phase for morning and night core clock genes. Our findings show that PHYA is necessary to synchronize the circadian clock and integration of light signaling to promote expression of the MtFT genes to precisely time flowering.

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A Circadian Rhythm Set by Dusk Determines the Expression of FT Homologs and the Short-Day Photoperiodic Flowering Response in Pharbitis

The Plant Cell ◽

10.1105/tpc.107.052480 ◽

2007 ◽

Vol 19 (10) ◽

pp. 2988-3000 ◽

Cited By ~ 142

Author(s):

Ryosuke Hayama ◽

Bhavna Agashe ◽

Elisabeth Luley ◽

Rod King ◽

George Coupland

Keyword(s):

Circadian Rhythm ◽

Flowering Response ◽

Short Day ◽

Photoperiodic Flowering

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BES1‐regulated BEE1 controls photoperiodic flowering downstream of blue light signaling pathway in Arabidopsis

New Phytologist ◽

10.1111/nph.15866 ◽

2019 ◽

Vol 223 (3) ◽

pp. 1407-1419 ◽

Cited By ~ 5

Author(s):

Fei Wang ◽

Yongshun Gao ◽

Yawen Liu ◽

Xin Zhang ◽

Xingxing Gu ◽

...

Keyword(s):

Signaling Pathway ◽

Blue Light ◽

Light Signaling ◽

Photoperiodic Flowering

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Gigantea: Uncovering New Functions in Flower Development

Genes ◽

10.3390/genes11101142 ◽

2020 ◽

Vol 11 (10) ◽

pp. 1142

Author(s):

Claudio Brandoli ◽

Cesar Petri ◽

Marcos Egea-Cortines ◽

Julia Weiss

Keyword(s):

Circadian Rhythm ◽

Flower Development ◽

Biological Function ◽

Genome Structure ◽

Floral Initiation ◽

Biological Functions ◽

Flower Production ◽

Photoperiodic Flowering ◽

Hormone Signalling

GIGANTEA (GI) is a gene involved in multiple biological functions, which have been analysed and are partially conserved in a series of mono- and dicotyledonous plant species. The identified biological functions include control over the circadian rhythm, light signalling, cold tolerance, hormone signalling and photoperiodic flowering. The latter function is a central role of GI, as it involves a multitude of pathways, both dependent and independent of the gene CONSTANS(CO), as well as on the basis of interaction with miRNA. The complexity of the gene function of GI increases due to the existence of paralogs showing changes in genome structure as well as incidences of sub- and neofunctionalization. We present an updated report of the biological function of GI, integrating late insights into its role in floral initiation, flower development and volatile flower production.

Download Full-text