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Article ; Online: The A-B-A of Floral Transition: The to Do List for Perfect Escape.

Conti, Lucio

2019 Volume 12, Issue 3, Page(s) 289–291

MeSH term(s)	Flowers/genetics ; Flowers/growth & development ; Flowers/metabolism ; Gene Expression Regulation, Plant ; Plant Development ; Plant Proteins/genetics ; Plant Proteins/metabolism ; Plants/genetics ; Plants/metabolism
Chemical Substances	Plant Proteins
Language	English
Publishing date	2019-02-19
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2393618-6
ISSN	1752-9867 ; 1674-2052
ISSN (online)	1752-9867
ISSN	1674-2052
DOI	10.1016/j.molp.2019.02.002
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Article ; Online: Hormonal control of the floral transition: Can one catch them all?

Conti, Lucio

Developmental biology

2017 Volume 430, Issue 2, Page(s) 288–301

Abstract: The transition to flowering marks a key adaptive developmental switch in plants which impacts on their survival and fitness. Different signaling pathways control the floral transition, conveying both endogenous and environmental cues. These cues are ... ...

Abstract	The transition to flowering marks a key adaptive developmental switch in plants which impacts on their survival and fitness. Different signaling pathways control the floral transition, conveying both endogenous and environmental cues. These cues are often relayed and/or modulated by different hormones, which might confer additional developmental flexibility to the floral process in the face of varying conditions. Among the different hormonal pathways, the phytohormone gibberellic acid (GA) plays a dominant role. GA is connected with the other floral pathways through the GA-regulated DELLA proteins, acting as versatile interacting modules for different signaling proteins. In this review, I will highlight the role of DELLAs as spatial and temporal modulators of different consolidated floral pathways. Next, building on recent data, I will provide an update on some emerging themes connecting other hormone signaling cascades to flowering time control. I will finally provide examples for some established as well as potential cross-regulatory mechanisms between hormonal pathways mediated by the DELLA proteins.
MeSH term(s)	Adaptation, Physiological ; Arabidopsis/genetics ; Arabidopsis/growth & development ; Arabidopsis/radiation effects ; Arabidopsis Proteins/physiology ; Flowers/growth & development ; Gene Expression Regulation, Plant ; Gibberellins/physiology ; Meristem/physiology ; Photoperiod ; Plant Growth Regulators/physiology ; Plant Shoots/growth & development ; Temperature
Chemical Substances	Arabidopsis Proteins ; GAI protein, Arabidopsis ; Gibberellins ; Plant Growth Regulators ; gibberellic acid (BU0A7MWB6L)
Language	English
Publishing date	2017--15
Publishing country	United States
Document type	Journal Article ; Review ; Research Support, Non-U.S. Gov't
ZDB-ID	1114-9
ISSN	1095-564X ; 0012-1606
ISSN (online)	1095-564X
ISSN	0012-1606
DOI	10.1016/j.ydbio.2017.03.024
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Article: Hormonal control of the floral transition: Can one catch them all?

Conti, Lucio

Developmental biology. 2017 Oct. 15, v. 430, no. 2

2017

Abstract	The transition to flowering marks a key adaptive developmental switch in plants which impacts on their survival and fitness. Different signaling pathways control the floral transition, conveying both endogenous and environmental cues. These cues are often relayed and/or modulated by different hormones, which might confer additional developmental flexibility to the floral process in the face of varying conditions. Among the different hormonal pathways, the phytohormone gibberellic acid (GA) plays a dominant role. GA is connected with the other floral pathways through the GA-regulated DELLA proteins, acting as versatile interacting modules for different signaling proteins. In this review, I will highlight the role of DELLAs as spatial and temporal modulators of different consolidated floral pathways. Next, building on recent data, I will provide an update on some emerging themes connecting other hormone signaling cascades to flowering time control. I will finally provide examples for some established as well as potential cross-regulatory mechanisms between hormonal pathways mediated by the DELLA proteins.
Keywords	flowering date ; gibberellic acid ; hormonal regulation ; hormones ; proteins ; signal transduction
Language	English
Dates of publication	2017-1015
Size	p. 288-301.
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	1114-9
ISSN	1095-564X ; 0012-1606
ISSN (online)	1095-564X
ISSN	0012-1606
DOI	10.1016/j.ydbio.2017.03.024
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Article ; Online: Histone Deacetylase Complex 1 and histone 1 epigenetically moderate stress responsiveness of Arabidopsis thaliana seedlings

Perrella, Giorgio / Fasano, Carlo / Donald, Naomi A. / Daddiego, Loretta / Fang, Weiwei / Martignago, Damiano / Carr, Craig / Conti, Lucio / Herzyk, Pawel / Amtmann, Anna

New Phytologist. 2024 Jan., v. 241, no. 1 p.166-179

2024

Abstract: Early responses of plants to environmental stress factors prevent damage but can delay growth and development in fluctuating conditions. Optimising these trade‐offs requires tunability of plant responsiveness to environmental signals. We have previously ... ...

Abstract	Early responses of plants to environmental stress factors prevent damage but can delay growth and development in fluctuating conditions. Optimising these trade‐offs requires tunability of plant responsiveness to environmental signals. We have previously reported that Histone Deacetylase Complex 1 (HDC1), which interacts with multiple proteins in histone deacetylation complexes, regulates the stress responsiveness of Arabidopsis seedlings, but the underlying mechanism remained elusive. Here, we show that HDC1 attenuates transcriptome re‐programming in salt‐treated seedlings, and we identify two genes (LEA and MAF5) that inhibit seedling establishment under salt stress downstream of HDC1. HDC1 attenuates their transcriptional induction by salt via a dual mechanism involving H3K9/14 deacetylation and H3K27 trimethylation. The latter, but not the former, was also abolished in a triple knockout mutant of the linker histone H1, which partially mimics the hypersensitivity of the hdc1‐1 mutant to salt stress. Although stress‐induced H3K27me3 accumulation required both H1 and HDC1, it was not fully recovered by complementing hdc1‐1 with a truncated, H1‐binding competent HDC1 suggesting other players or independent inputs. The combined findings reveal a dual brake function of HDC1 via regulating both active and repressive epigenetic marks on stress‐inducible genes. This natural ‘anti‐panic’ device offers a molecular leaver to tune stress responsiveness in plants.
Keywords	Arabidopsis thaliana ; epigenetics ; growth and development ; histone deacetylase ; histones ; hypersensitivity ; mutants ; plant establishment ; salt stress ; transcription (genetics) ; transcriptome
Language	English
Dates of publication	2024-01
Size	p. 166-179.
Publishing place	John Wiley & Sons, Ltd
Document type	Article ; Online
Note	JOURNAL ARTICLE
ZDB-ID	208885-x
ISSN	1469-8137 ; 0028-646X
ISSN (online)	1469-8137
ISSN	0028-646X
DOI	10.1111/nph.19165
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Article ; Online: Abscisic Acid and Flowering Regulation: Many Targets, Different Places.

Martignago, Damiano / Siemiatkowska, Beata / Lombardi, Alessandra / Conti, Lucio

International journal of molecular sciences

2020 Volume 21, Issue 24

Abstract: Plants can react to drought stress by anticipating flowering, an adaptive strategy for plant survival in dry climates known as drought escape (DE). In Arabidopsis, the study of DE brought to surface the involvement of abscisic acid (ABA) in controlling ... ...

Abstract	Plants can react to drought stress by anticipating flowering, an adaptive strategy for plant survival in dry climates known as drought escape (DE). In Arabidopsis, the study of DE brought to surface the involvement of abscisic acid (ABA) in controlling the floral transition. A central question concerns how and in what spatial context can ABA signals affect the floral network. In the leaf, ABA signaling affects flowering genes responsible for the production of the main florigen FLOWERING LOCUS T (FT). At the shoot apex, FD and FD-like transcription factors interact with FT and FT-like proteins to regulate ABA responses. This knowledge will help separate general and specific roles of ABA signaling with potential benefits to both biology and agriculture.
MeSH term(s)	Abscisic Acid/pharmacology ; Flowers/drug effects ; Flowers/growth & development ; Flowers/metabolism ; Gene Expression Regulation, Plant/drug effects ; Magnoliopsida/drug effects ; Magnoliopsida/growth & development ; Magnoliopsida/metabolism ; Plant Proteins/genetics ; Plant Proteins/metabolism
Chemical Substances	Plant Proteins ; Abscisic Acid (72S9A8J5GW)
Language	English
Publishing date	2020-12-18
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2019364-6
ISSN	1422-0067 ; 1422-0067 ; 1661-6596
ISSN (online)	1422-0067
ISSN	1422-0067 ; 1661-6596
DOI	10.3390/ijms21249700
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Article ; Online: Correction: The bZIP transcription factor AREB3 mediates FT signalling and floral transition at the Arabidopsis shoot apical meristem.

Martignago, Damiano / Falavigna, Vítor da Silveira / Lombardi, Alessandra / Gao, He / Krukowski, Paolo Korwin / Galbiati, Massimo / Tonelli, Chiara / Coupland, George / Conti, Lucio

PLoS genetics

2023 Volume 19, Issue 8, Page(s) e1010920

Abstract: This corrects the article DOI: 10.1371/journal.pgen.1010766.]. ...

Abstract	[This corrects the article DOI: 10.1371/journal.pgen.1010766.].
Language	English
Publishing date	2023-08-29
Publishing country	United States
Document type	Published Erratum
ZDB-ID	2186725-2
ISSN	1553-7404 ; 1553-7390
ISSN (online)	1553-7404
ISSN	1553-7390
DOI	10.1371/journal.pgen.1010920
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Article: Expression of the VvMYB60 Transcription Factor Is Restricted to Guard Cells and Correlates with the Stomatal Conductance of the Grape Leaf

Simeoni, Fabio / Simoni, Laura / Zottini, Michela / Conti, Lucio / Tonelli, Chiara / Castorina, Giulia / Espen, Luca / Galbiati, Massimo

Agronomy. 2022 Mar. 13, v. 12, no. 3

2022

Abstract: The modulation of stomatal activity is a relevant trait in grapes, as it defines the isohydric/anysohydric behavior of different cultivars and directly affects water-use efficiency and drought resistance of vineyards. The grape transcription factor ... ...

Abstract	The modulation of stomatal activity is a relevant trait in grapes, as it defines the isohydric/anysohydric behavior of different cultivars and directly affects water-use efficiency and drought resistance of vineyards. The grape transcription factor VvMYB60 has been proposed as a transcriptional regulator of stomatal responses based on its ectopic expression in heterologous systems. Here, we directly addressed the cellular specificity of VvMYB60 expression in grape leaves by integrating independent approaches, including the qPCR analysis of purified stomata and the transient expression of a VvMYB60 promoter: GFP fusion. We also investigated changes in the VvMYB60 expression in different rootstocks in response to declining water availability. Our results indicate that VvMYB60 is specifically expressed in guard cells and that its expression tightly correlates with the level of stomatal conductance (gₛ) of the grape leaf. As a whole, these findings highlight the relevance of the VvMYB60 regulatory network in mediating stomatal activity in grapes.
Keywords	agronomy ; cell specificity ; cultivars ; drought tolerance ; grapes ; stomatal conductance ; transcription factors ; water use efficiency
Language	English
Dates of publication	2022-0313
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article
ZDB-ID	2607043-1
ISSN	2073-4395
ISSN	2073-4395
DOI	10.3390/agronomy12030694
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Article: Increased phenylpropanoids production in UV-B irradiated Salvia verticillata as a consequence of altered genes expression in young leaves

Rizi, Marziye Rahimi / Azizi, Ali / Sayyari, Mohammad / Mirzaie-Asl, Asghar / Conti, Lucio

Plant physiology and biochemistry. 2021 Oct., v. 167

2021

Abstract: Ultraviolet-B (UV–B) radiation as an environmental potential elicitor induces the synthesis of plant secondary metabolites. The effects of UV-B radiation on photosynthetic pigments and dry weight, biochemical and molecular features of old and young ... ...

Abstract	Ultraviolet-B (UV–B) radiation as an environmental potential elicitor induces the synthesis of plant secondary metabolites. The effects of UV-B radiation on photosynthetic pigments and dry weight, biochemical and molecular features of old and young leaves of Salvia verticillata were investigated. Plants were exposed to 10.97 kJ m⁻² day⁻¹ of biologically effective UV-B radiation for up to 10 days. The sampling process was performed in four steps: 1, 5, 10, and 13 days (recovery time) after the start of irradiation. As a result of plant investment in primary and secondary metabolism, the production of phenolic compounds increased, while chlorophyll levels and leaf dry weight (%) declined. Under long-term UV-B exposure, young leaves exhibited the most significant reduction in chlorophyll a and b content and leaf dry weight. The highest level of total phenol (1.34-fold) and flavonoid concentration (2-fold) relative to the control was observed on the 5th day and recovery time, respectively. Young leaves demonstrated the highest amount of phenolic acids in recovery time. Young leaves on the 5th day of the experiment exerted the highest level of antioxidant activity when compared to the control. A positive correlation was observed between antioxidant activity and the amount of phenolic compounds. Regarding the expression of phenylpropanoid pathway genes, UV-B enhanced the expression of phenylalanine ammonia-lyase, tyrosine aminotransferase, and rosmarinic acid synthase with the highest level in young leaves on the 10th day. Overall, young leaves of S. verticillata indicated higher sensitivity to UV-B radiation and developed more tangible reactions to such radiation.
Keywords	Salvia ; antioxidant activity ; chlorophyll ; elicitors ; flavonoids ; irradiation ; leaf dry mass ; phenols ; phenylalanine ammonia-lyase ; photosynthesis ; plant physiology ; rosmarinic acid ; secondary metabolites ; tyrosine transaminase ; ultraviolet radiation
Language	English
Dates of publication	2021-10
Size	p. 174-184.
Publishing place	Elsevier Masson SAS
Document type	Article
ZDB-ID	742978-2
ISSN	1873-2690 ; 0981-9428
ISSN (online)	1873-2690
ISSN	0981-9428
DOI	10.1016/j.plaphy.2021.07.037
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Article ; Online: Increased phenylpropanoids production in UV-B irradiated Salvia verticillata as a consequence of altered genes expression in young leaves.

Rizi, Marziye Rahimi / Azizi, Ali / Sayyari, Mohammad / Mirzaie-Asl, Asghar / Conti, Lucio

Plant physiology and biochemistry : PPB

2021 Volume 167, Page(s) 174–184

Abstract: Ultraviolet-B (UV-B) radiation as an environmental potential elicitor induces the synthesis of plant secondary metabolites. The effects of UV-B radiation on photosynthetic pigments and dry weight, biochemical and molecular features of old and young ... ...

Abstract	Ultraviolet-B (UV-B) radiation as an environmental potential elicitor induces the synthesis of plant secondary metabolites. The effects of UV-B radiation on photosynthetic pigments and dry weight, biochemical and molecular features of old and young leaves of Salvia verticillata were investigated. Plants were exposed to 10.97 kJ m
MeSH term(s)	Antioxidants ; Chlorophyll A ; Phenols ; Plant Leaves ; Salvia ; Ultraviolet Rays
Chemical Substances	Antioxidants ; Phenols ; Chlorophyll A (YF5Q9EJC8Y)
Language	English
Publishing date	2021-07-30
Publishing country	France
Document type	Journal Article
ZDB-ID	742978-2
ISSN	1873-2690 ; 0981-9428
ISSN (online)	1873-2690
ISSN	0981-9428
DOI	10.1016/j.plaphy.2021.07.037
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Article ; Online: The bZIP transcription factor AREB3 mediates FT signalling and floral transition at the Arabidopsis shoot apical meristem.

Martignago, Damiano / da Silveira Falavigna, Vítor / Lombardi, Alessandra / Gao, He / Korwin Krukowski, Paolo / Galbiati, Massimo / Tonelli, Chiara / Coupland, George / Conti, Lucio

PLoS genetics

2023 Volume 19, Issue 5, Page(s) e1010766

Abstract: The floral transition occurs at the shoot apical meristem (SAM) in response to favourable external and internal signals. Among these signals, variations in daylength (photoperiod) act as robust seasonal cues to activate flowering. In Arabidopsis, long- ... ...

Abstract	The floral transition occurs at the shoot apical meristem (SAM) in response to favourable external and internal signals. Among these signals, variations in daylength (photoperiod) act as robust seasonal cues to activate flowering. In Arabidopsis, long-day photoperiods stimulate production in the leaf vasculature of a systemic florigenic signal that is translocated to the SAM. According to the current model, FLOWERING LOCUS T (FT), the main Arabidopsis florigen, causes transcriptional reprogramming at the SAM, so that lateral primordia eventually acquire floral identity. FT functions as a transcriptional coregulator with the bZIP transcription factor FD, which binds DNA at specific promoters. FD can also interact with TERMINAL FLOWER 1 (TFL1), a protein related to FT that acts as a floral repressor. Thus, the balance between FT-TFL1 at the SAM influences the expression levels of floral genes targeted by FD. Here, we show that the FD-related bZIP transcription factor AREB3, which was previously studied in the context of phytohormone abscisic acid signalling, is expressed at the SAM in a spatio-temporal pattern that strongly overlaps with FD and contributes to FT signalling. Mutant analyses demonstrate that AREB3 relays FT signals redundantly with FD, and the presence of a conserved carboxy-terminal SAP motif is required for downstream signalling. AREB3 shows unique and common patterns of expression with FD, and AREB3 expression levels are negatively regulated by FD thus forming a compensatory feedback loop. Mutations in another bZIP, FDP, further aggravate the late flowering phenotypes of fd areb3 mutants. Therefore, multiple florigen-interacting bZIP transcription factors have redundant functions in flowering at the SAM.
MeSH term(s)	Arabidopsis/genetics ; Arabidopsis/metabolism ; Arabidopsis Proteins/genetics ; Arabidopsis Proteins/metabolism ; Basic-Leucine Zipper Transcription Factors/genetics ; Basic-Leucine Zipper Transcription Factors/metabolism ; Florigen/metabolism ; Flowers/metabolism ; Gene Expression Regulation, Plant ; Meristem/genetics ; Meristem/metabolism
Chemical Substances	Arabidopsis Proteins ; Basic-Leucine Zipper Transcription Factors ; Florigen ; AREB3 protein, Arabidopsis ; FT protein, Arabidopsis
Language	English
Publishing date	2023-05-15
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2186725-2
ISSN	1553-7404 ; 1553-7390
ISSN (online)	1553-7404
ISSN	1553-7390
DOI	10.1371/journal.pgen.1010766
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