Recurrent symmetrical bendings cause dwarfing in Hydrangea through spatial molecular regulation of xylem cell walls.

Autor:	Ley-Ngardigal B; Univ Angers, Institut Agro, INRAE, IRHS, SFR QUASAV, Angers, France.; Hortensia France Company, Rives-du-Loir-en-Anjou, France., Roman H; Hortensia France Company, Rives-du-Loir-en-Anjou, France., Brouard N; Univ Angers, Institut Agro, INRAE, IRHS, SFR QUASAV, Angers, France., Huché-Thélier L; Univ Angers, Institut Agro, INRAE, IRHS, SFR QUASAV, Angers, France., Guérin V; Univ Angers, Institut Agro, INRAE, IRHS, SFR QUASAV, Angers, France., Leduc N; Univ Angers, Institut Agro, INRAE, IRHS, SFR QUASAV, Angers, France.
Jazyk:	angličtina
Zdroj:	Frontiers in plant science [Front Plant Sci] 2024 Jan 16; Vol. 14, pp. 1268272. Date of Electronic Publication: 2024 Jan 16 (Print Publication: 2023).
DOI:	10.3389/fpls.2023.1268272
Abstrakt:	Environmental prejudices progressively lead to the ban of dwarfing molecules in agriculture, and alternatives are urgently required. Mechanical stimulation (MS) is a promising, eco-friendly, and economical technique, but some responses to mechanical stimulation vary from one plant species to another. Additionally, as more frequent and violent wind episodes are forecasted under global climate change, knowledge of plant responses to stimuli mimicking wind sways is decisive for agriculture. However, little is known about plant mechanosensitive responses after long-term, recurrent MS. Here, the effects of 3-week, recurrent, symmetrical bendings (1 or 12 per day) in Hydrangea macrophylla stems are examined. Bendings repressed internode elongation and leaf area development, whereas the diametrical growth of the basal internode is increased. Responses were dose-dependent, and no desensitization was observed during the 3 weeks of treatment. MS was almost as efficient as daminozide for plant dwarfing, and it improved stem robustness. Histological and molecular responses to MS were spatially monitored and were concordant with ongoing primary or secondary growth in the internodes. Our molecular data provide the first knowledge on the molecular paths controlled by mechanical loads in Hydrangea and revealed for the first time the involvement of XYP1 in thigmomorphogenetic responses. MS still had a transcriptional impact 48 h after the last bending session, promoting the expression of XYP1 , FLA11 , and CAD1 while repressing the expression of EXP3 and XTH33 homologs in accordance with xylogenesis, cell wall thickening, and lignin deposition in the xylem of basal internodes. In upper elongating internodes, repression of XYP1 , CAD1 , SAMS1 , and CDC23 homologs is correlated with ongoing primary, even though stunted, growth. For producers, our findings highlight the potential of MS as a sustainable and economical option for controlling plant compactness in Hydrangea and show valuable reinforcement of stem strength. Competing Interests: Authors BL-N and HR were employed by the company Hortensia France. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2024 Ley-Ngardigal, Roman, Brouard, Huché-Thélier, Guérin and Leduc.)
Databáze:	MEDLINE
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