Role of chromatin modification in flowering-time control

Abstract FLOWERING LOCUS T-like (FT-like) genes control the photoperiodic regulation of flowering in many angiosperm plants. The family of FT-like genes is characterized by extensive gene duplication and subsequent diversification of FT functions which occurred independently in modern angiosperm lineages. In barley, there are 12 known FT-like genes (HvFT), but the function of most of them remains uncharacterized. This study aimed to characterize the role of HvFT4 in flowering time control and development in barley. The overexpression of HvFT4 in the spring cultivar Golden Promise delayed flowering time under long-day conditions. Microscopic dissection of the shoot apical meristem revealed that overexpression of HvFT4 specifically delayed spikelet initiation and reduced the number of spikelet primordia and grains per spike. Furthermore, ectopic overexpression of HvFT4 was associated with floret abortion and with the down-regulation of the barley MADS-box genes VRN-H1, HvBM3, and HvBM8 which promote floral development. This suggests that HvFT4 functions as a repressor of reproductive development in barley. Unraveling the genetic basis of FT-like genes can contribute to the identification of novel breeding targets to modify reproductive development and thereby spike morphology and grain yield.

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Characterization of genes associated with TGA7 during the floral transition

BMC Plant Biology ◽

10.1186/s12870-021-03144-w ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Xiaorui Xu ◽

Jingya Xu ◽

Chen Yuan ◽

Yikai Hu ◽

Qinggang Liu ◽

...

Keyword(s):

Flowering Time ◽

Differentially Expressed Genes ◽

Expression Profiles ◽

Defense Responses ◽

Floral Transition ◽

Differentially Expressed ◽

Time Control ◽

Delayed Flowering ◽

Flowering Time Control

Abstract Background The TGACG-binding (TGA) family has 10 members that play vital roles in Arabidopsis thaliana defense responses and development. However, their involvement in controlling flowering time remains largely unknown and requires further investigation. Results To study the role of TGA7 during floral transition, we first investigated the tga7 mutant, which displayed a delayed-flowering phenotype under both long-day and short-day conditions. We then performed a flowering genetic pathway analysis and found that both autonomous and thermosensory pathways may affect TGA7 expression. Furthermore, to reveal the differential gene expression profiles between wild-type (WT) and tga7, cDNA libraries were generated for WT and tga7 mutant seedlings at 9 days after germination. For each library, deep-sequencing produced approximately 6.67 Gb of high-quality sequences, with the majority (84.55 %) of mRNAs being between 500 and 3,000 nt. In total, 325 differentially expressed genes were identified between WT and tga7 mutant seedlings. Among them, four genes were associated with flowering time control. The differential expression of these four flowering-related genes was further validated by qRT-PCR. Conclusions Among these four differentially expressed genes associated with flowering time control, FLC and MAF5 may be mainly responsible for the delayed-flowering phenotype in tga7, as TGA7 expression was regulated by autonomous pathway genes. These results provide a framework for further studying the role of TGA7 in promoting flowering.

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FLOWERING LOCUS T4 (HvFT4) delays flowering and decreases floret fertility in barley

10.1101/2020.03.26.010033 ◽

2020 ◽

Author(s):

Rebecca Pieper ◽

Filipa Tomé ◽

Maria von Korff

Keyword(s):

Flowering Time ◽

Reproductive Development ◽

Negative Regulator ◽

Flowering Locus T ◽

Time Control ◽

Photoperiodic Regulation ◽

Flowering Locus ◽

Delayed Flowering ◽

Flowering Time Control

AbstractFLOWERING LOCUS T-like genes (FT-like) control the photoperiodic regulation of flowering in many angiosperm plants. The family of FT-like genes is characterised by extensive gene duplication and subsequent diversification of FT functions which occurred independently in modern angiosperm lineages. In barley, there are 12 known FT-like genes (HvFT) but the function of most of them remains uncharacterised. This study aimed to characterise the role of HvFT4 in flowering time control and development in barley. The overexpression of HvFT4 in the spring cultivar Golden Promise delayed flowering time under long-day conditions. Microscopic dissection of the shoot apical meristem (SAM) revealed that overexpression of HvFT4 specifically delayed spikelet initiation and reduced the number of spikelet primordia and grains per spike. Furthermore, ectopic overexpression of HvFT4 was associated with floret abortion and with the downregulation of the barley MADS-box genes VRN-H1, HvBM3 and HvBM8 which promote floral development. This suggests that HvFT4 functions as a repressor of reproductive development in barley. Unraveling the genetic basis of FT-like genes can contribute to the identification of novel breeding targets to modify reproductive development and thereby spike morphology and grain yield.HighlightWe identify the FLOWERING LOCUS T (FT)-like gene HvFT4 as a negative regulator of reproductive development, spikelet initiation, floret fertility and grain number in barley.

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Recent Advances in Flowering Time Control

10.3389/978-2-88945-115-9 ◽

2017 ◽

Keyword(s):

Flowering Time ◽

Time Control ◽

Recent Advances ◽

Flowering Time Control

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New Nucleotide Polymorphisms in the BTC1 gene of Sugar Beet

Biotekhnologiya ◽

10.21519/0234-2758-2020-36-6-49-54 ◽

2020 ◽

Vol 36 (6) ◽

pp. 49-54

Author(s):

A.A. Nalbandyan ◽

T.P. Fedulova ◽

I.V. Cherepukhina ◽

T.I. Kryukova ◽

N.R. Mikheeva ◽

...

Keyword(s):

Sugar Beet ◽

Flowering Time ◽

Molecular Genetic ◽

Bioinformatic Analysis ◽

Early Flowering ◽

Nucleotide Polymorphisms ◽

Nucleotide Substitutions ◽

Time Control ◽

Flowering Time Control ◽

Exon 10

The flowering time control gene of various sugar beet plants has been studied. The BTC1 gene is a regulator for the suppressor (flowering time 1) and inducer (flowering time 2) genes of this physiological process. The F9/R9 primer pair was used for polymerase chain reaction; these primers are specific to the BTC1 gene region containing exon 9, as well as intron and exon 10. For the first time, nucleotide substitutions in exon 10 of BTC1 gene were identified in bolting sensitive samples (HF1 and BF1), which led to a change in the amino acid composition of the coded polypeptide chain. Based on the results of bioinformatic analysis, it can be assumed that certain nucleotide polymorphisms in the BTC1 gene may determine with a high probability the predisposition of sugar beet genotypes to early flowering. The use of the Geneious Prime tool for the analysis of the BTC1 gene sequences may allow the culling of genotypes prone to early flowering at early stages of selection. sugar beet, flowering gene, BTC1, genetic polymorphism, PCR, molecular genetic markers, selection

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Message ends: RNA 3′ processing and flowering time control

Journal of Experimental Botany ◽

10.1093/jxb/ert439 ◽

2013 ◽

Vol 65 (2) ◽

pp. 353-363 ◽

Cited By ~ 14

Author(s):

Katarzyna Rataj ◽

Gordon G. Simpson

Keyword(s):

Flowering Time ◽

Time Control ◽

Flowering Time Control

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Characterization of Genes Associated with TGA7 During the Floral Transition

10.21203/rs.3.rs-78841/v1 ◽

2020 ◽

Author(s):

Xiaorui Xu ◽

Jingya Xu ◽

Chen Yuan ◽

Yikai Hu ◽

Qinggang Liu ◽

...

Keyword(s):

Flowering Time ◽

Expression Profiles ◽

Plant Defence ◽

Gene Expression Profiles ◽

Floral Transition ◽

Cdna Libraries ◽

Genetic Pathways ◽

Time Control ◽

Pathways Analysis

Abstract BackgroundThe TGA family has ten members and plays vital roles in plant defence and development in Arabidopsis. However, involvement of TGAs in control of flowering time remains largely unknown and requires further investigation. ResultsTo study the role of TGA7 during the floral transition, we first tested phenotypes of tga7 mutant, which displayed delay-flowering phenotype under both long-day and short-day conditions. We then performed flowering genetic pathways analysis and found that both autonomous and thermosensory pathways may affect TGA7 expression. Furthermore, to reveal differential gene expression profiles between wild-type (WT) and tga7, cDNA libraries were generated for WT and tga7 mutant seedlings at 9 DAG (days after germination). For each library, deep-sequencing produced approximately 6.67 Gb of high-quality sequences with the majority (84.55%) of mRNAs between 500 and 3000 nucleotides in length. Three hundred and twenty-five differentially expressed genes (DEGs) were identified between WT and tga7 mutant seedlings. Among them, four genes are associated with flowering time control. Differential expression of the four flowering-related DEGs was further validated by qRT-PCR.ConclusionsTransciptomic sequencing coupled with flowering genetic pathways analysis provides a framework for further studying the role of TGA7 in promoting flowering.

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Repeated rearrangement of the GSL‐AOP locus contributed to spatio‐temporal variation in defense chemistry in Arabidopsis

10.21203/rs.3.rs-108131/v1 ◽

2020 ◽

Author(s):

Konrad Weber ◽

Lucasz Krych ◽

Meike Burow

Keyword(s):

Flowering Time ◽

Regulatory Networks ◽

Structural Diversity ◽

Sequence Information ◽

Sequencing Data ◽

Defense Compounds ◽

Caucasus Region ◽

Time Control ◽

Spatio Temporal ◽

Flowering Time Control

Abstract Plants coordinate metabolic and developmental processes with the help of genetically variable, interconnected regulatory networks. The GSL-AOP locus in Arabidopsis thaliana encodes enzymes involved in the biosynthesis of glucosinolate defense compounds and has been attributed regulatory functions e.g. in flowering time control. To correlate genetic and phenotypic variation linked to GSL-AOP, we conducted a phylogenetic analysis across 1135 accessions and found that the available short-read sequencing data does not fully resolve the structural diversity in the locus. We analyzed a selection of 74 accessions for glucosinolate profiles and flowering time under different conditions and acquired long-read sequence information for glucosinolate and flowering time loci. Especially in the Caucasus region, structural variation in GSL-AOP was associated with conditional, tissue-specific glucosinolate profiles. Variation in FLC among the Caucasian accessions correlated with variation in the flowering time response to vernalization, suggesting that local adaptation has shaped defense and development in an orchestrated manner.

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BBX32 Interacts with AGL24 Involved in Flowering Time Control in Chinese Cabbage (Brassica rapa L. ssp. pekinensis)

Notulae Botanicae Horti Agrobotanici Cluj-Napoca ◽

10.15835/nbha47111205 ◽

2018 ◽

Vol 47 (1) ◽

pp. 34-45

Author(s):

Guan-Peng MA ◽

Da-Qin ZHAO ◽

Tian-Wen WANG ◽

Lin-Bi ZHOU ◽

Gui-Lian LI

Keyword(s):

Arabidopsis Thaliana ◽

Circadian Clock ◽

Flowering Time ◽

Brassica Rapa ◽

Chinese Cabbage ◽

Protein Interactions ◽

Protein Protein Interactions ◽

Time Control ◽

Flowering Time Control ◽

Molecular Regulatory Mechanisms

B-box (BBX) zinc finger proteins play critical roles in both vegetative and reproductive development in plants. Many BBX proteins have been identified in Arabidopsis thaliana as floral transition regulatory factors, such as CO, BBX7 (COL9), BBX19, and BBX32. BBX32 is involved in flowering time control through repression of COL3 in Arabidopsis thaliana, but it is still elusive that whether and how BBX32 directly interacts with flowering signal integrators of AGAMOUS-LIKE 24 (AGL24) and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (SOC1) in Chinese cabbage (Brassica rapa L. ssp. pekinensis) or other plants. In this study, B-box-32(BBX32), a transcription factor in this family with one B-box motif was cloned from B. rapa, acted as a circadian clock protein, showing expression changes during the circadian period. Additional experiments using GST pull-down and yeast two-hybrid assays indicated that BrBBX32 interacts with BrAGL24 and does not interact with BrSOC1, while BrAGL24 does interact with BrSOC1. To investigate the domains involved in these protein-protein interactions, we tested three regions of BrBBX32. Only the N-terminus interacted with BrAGL24, indicating that the B-box domain may be the key region for protein interaction. Based on these data, we propose that BrBBX32 may act in the circadian clock pathway and relate to the mechanism of flowering time regulation by binding to BrAGL24 through the B-box domain. This study will provide valuable information for unraveling the molecular regulatory mechanisms of BrBBX32 in flowering time of B. rapa.

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