Hormonal control of the floral transition: Can one catch them all?

Conti, Lucio

doi:10.1016/j.ydbio.2017.03.024

Cited by 124 publications

(87 citation statements)

References 226 publications

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“…And the down-regulated expression of the GA receptor gene JcGID1C after floral initiation (Fig. 4), which could result in a decreased GA sensitivity, may further reinforce the regulation of GAresponsive genes involved in floral initiation (CamposRivero and others 2017;Conti 2017;Davière and Achard 2013). The result is in agreement with previous studies of other woody plant species.…”

Section: Discussionsupporting

confidence: 91%

“…Floral formation is controlled strictly by the physiological state of the plant and environmental factors (Wellmer and Riechmann 2010). Gibberellin (GA) has been reported to control flowering in many plant species (Campos-Rivero and others 2017;Conti 2017). The ability of GA to promote floral initiation in plants has been established primarily for long-day and biennial species under conditions that would not normally permit flowering (Lang 1957).…”

Section: Introductionmentioning

confidence: 99%

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Gibberellin Inhibits Floral Initiation in the Perennial Woody Plant Jatropha curcas

Pan

Niu

et al. 2018

J Plant Growth Regul

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Gibberellin (GA) is an important phytohormone and has been reported to promote flowering in annual and biennial plants, but may play an opposite role in woody perennial plants. In this study, the promoting or inhibiting effect of GA on floral initiation was investigated in Jatropha curcas L., a perennial woody plant, which has great potential as renewable energy plant due to the high oil content in the seed. We found that exogenous application of gibberellic acid (GA 3 ) inhibited flowering, whereas GA biosynthesis inhibitors promoted flowering. The promotive effect of the GA biosynthesis inhibitor paclobutrazol on floral initiation could be diminished by GA 3 treatment. The expression levels of GA biosynthesis genes Jatropha GA 3-oxidase 3 (JcGA3ox3) and the GA receptor genes, Jatropha GA-INSENSITIVE DWARF 1C (JcGID1C) were decreased, whereas a GA catabolism gene, Jatropha GA 2-oxidase 8 (JcGA2ox8), was elevated during floral transition. These results suggest that GA inhibits floral initiation in J. curcas.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Gibberellin Inhibits Floral Initiation in the Perennial Woody Plant Jatropha curcas

Pan

Niu

et al. 2018

J Plant Growth Regul

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“…In arabidopsis, FLC is known to repress the floral integrator SOC1 , whereas bioactive GA promotes flowering by upregulating SOC1 (Conti, ; Helliwell et al., ; Lee & Lee, ; Moon et al, ). For the summer annual genotype CO46, transcript abundance of SOC1 linked to chromosomes 4, 5, and 6 all had greater transcript abundance prevernalization compared to the winter annual genotype Joelle (Table ; Supporting Information Table ‐Log2 suppl).…”

Section: Resultsmentioning

confidence: 99%

Expression of FLOWERING LOCUS C and a frameshift mutation of this gene on chromosome 20 differentiate a summer and winter annual biotype of Camelina sativa

et al. 2018

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The nature of the vegetative to reproductive transition in the shoot apical meristem of Camelina sativa summer annual cultivar CO46 and winter annual cultivar Joelle was confirmed by treating seedlings with or without 8 weeks of vernalization. True to their life cycle classification, Joelle required a vernalization treatment to induce bolting and flowering, whereas CO46 did not. In this study, whole genome sequence, RNAseq, and resequencing of PCR‐amplified transcripts for a key floral repressor were used to better understand factors involved in the flowering habit of summer and winter biotypes at the molecular level. Analysis of transcriptome data indicated that abundance for one of the three genes encoding the floral repressor FLOWERING LOCUS C (FLC; Csa20 g015400) was 16‐fold greater in Joelle compared to CO46 prior to vernalization. Abundance of this transcript decreased only slightly in CO46 postvernalization, compared to a substantial decrease in Joelle. The results observed in the winter annual biotype Joelle are consistent with repression of FLC by vernalization. Further characterization of FLC at both the genome and transcriptome levels identified a one base deletion in the 5th exon coding for a keratin‐binding domain in chromosome 20 of CO46 and Joelle. The one base deletion detected in chromosome 20 FLC is predicted to result in a frameshift that would produce a nonfunctional protein. Analysis of whole genome sequence indicated that the one base deletion in chromosome 20 FLC occurred at a greater ratio in the summer biotype CO46 (2:1) compared to the winter biotype Joelle (1:4); similar trends were also observed for RNAseq and cDNA transcripts mapping to chromosome 20 FLC of CO46 and Joelle.

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“…The mechanism of interdependence between flowering and fibers deposition remains obscure, but it is clear that this connection exists (Chaffey et al., ; Lens et al., 2012b). The formation of fibrous wood may be induced by gibberellic acid, which plays an important role both in the developmental switch to flowering (Conti, ) and in stimulating secondary xylem differentiation and expansion of cambial derivatives, including fiber elongation (Moritz et al., ; Israelsson et al., ; Mauriat and Moritz, ; Ragni et al., ; Strabala and MacMillan, ; Ye and Zhong, ; Ragni and Greb, ). If so, the shift from parenchymatous to fibrous wood could be explained by the switch from vegetative to reproductive growth in the plant life history.…”

Section: Discussionmentioning

confidence: 99%

Parallel evolution of arborescent carrots (Daucus) in Macaronesia

Frankiewicz

Oskolski

Banasiak

et al. 2020

American J of Botany

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Premise Despite intensive research, the pathways and driving forces behind the evolution of derived woodiness on oceanic islands remain obscure. The genus Daucus comprises mostly herbs (therophytes, hemicryptophytes) with few rosette treelets (chamaephytes) endemic to various Macaronesian archipelagos, suggesting their independent evolution. To elucidate the evolutionary pathways to derived woodiness, we examined phylogenetic relationships and the habit and secondary xylem evolution in Daucus and related taxa. Methods Sixty taxa were surveyed for molecular markers, life history, and habit traits. Twenty‐one species were considered for wood anatomical characters. A dated phylogeny was estimated using Bayesian methods. The evolution of selected traits was reconstructed using parsimony and maximum likelihood. Results Daucus dispersed independently to the Canary Islands (and subsequently to Madeira), Cape Verde, and the Azores in the late Miocene and Pleistocene. Life span, reproductive strategy, and life form were highly homoplastic; the ancestor of Daucus was probably a monocarpic, biennial hemicryptophyte. Rosette treelets evolved independently in the Canarian‐Madeiran lineage and in Cape Verde, the latter within the last 0.13 Myr. Treelets and hemicryptophytes did not differ in wood anatomy. Pervasive axial parenchyma in wood occurred more often in polycarpic rather than monocarpic species. Conclusions Life span and life form in Daucus are evolutionarily labile and may change independently of wood anatomy, which is related to plant reproductive strategy rather than to life form. Insular woodiness may evolve rapidly (as demonstrated in D. bischoffii), and in Daucus, it does not seem to be an adaptation to lower the risk of xylem embolism.

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Hormonal control of the floral transition: Can one catch them all?

Cited by 124 publications

References 226 publications

Gibberellin Inhibits Floral Initiation in the Perennial Woody Plant Jatropha curcas

Gibberellin Inhibits Floral Initiation in the Perennial Woody Plant Jatropha curcas

Expression of FLOWERING LOCUS C and a frameshift mutation of this gene on chromosome 20 differentiate a summer and winter annual biotype of Camelina sativa

Parallel evolution of arborescent carrots (Daucus) in Macaronesia

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