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In What Way Do Gibberellins Increase Apical Dominance and Correlative Inhibition?

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Abstract

The interactions of branches in relation to the transports of IAA export activity (IEA) were studied in pea plants of the semidwarf cv. Adagumsky having a strong apical dominance (AD) and the dwarf cv. Porta with a weakened AD. In a model system of two-branched seedlings, the branches of cv. Adagumsky competitively suppressed the growth and IEA of each other, but that is not the case with cv. Porta. The root supply with GA3 inhibits the outgrowth of axillary buds at basal node 2 in cv. Porta seedlings, thus enhancing AD, and led to establishing a 1.5 fold different IEA in the shoots between two-branched and one-branched seedlings, making it similar to cv. Adagumsky. Thus, the emerging role of GAs as a systemic signal in regulation of AD and correlative inhibition is suggested. Molecular mechanisms of GA involvement in these processes are discussed.

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ACKNOWLEDGMENTS

We thank Dr. Catherine Rameau (INRA Centre de Versailles-Grignon, France) very much for providing the seeds of pea wild-type cv. Porta.

Funding

The research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (no. 121033000137-1).

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  1. Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, 127276, Moscow, Russia

    A. A. Kotov & L. M. Kotova

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Correspondence to A. A. Kotov.

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Abbreviations: 2-B and 1-B—two- and one-branched plants, respectively; AD—apical dominance; ARF—AUXIN RESPONSE FACTOR; Aux/IAA—AUXIN/INDOLE-3-ACETIC ACID INDUCIBLE protein, a transcriptional repressor of auxin-inducible genes; CCD7/MAX3/RMS5 and CCD8/MAX4/RMS1—carotenoid cleavage dioxygenases of Arabidopsis/pea; CI—correlative inhibition; CK—cytokinin; CKX—cytokinin oxidase; D14/AtD14/RMS3—rice/Arabidopsis/pea strigolactone receptor; D53/SMXL—SUPPRESSOR OF MAX2 1-LIKE protein, first target protein in strigolactone signaling; DELLA—a conserved DELLA domain in GA signaling proteins; IEA—IAA export activity; IPT—adenosine phosphate-ISOPENTENYLTRANSFERASE; LOG—Lonely Guy, enzyme which convert cytokinin nucleotides in free basis; MAX2/RMS4/D3—the Arabidopsis/pea/rice F-box protein, a component of SCF E3 ubiquitin ligase complex; PID—Ser/Thr kinase PINOID; PIF—PHYTOCHROME-INTERACTING FACTOR protein; PIN—membrane auxin efflux carriers of the family PINFORMED; PM—plasma membrane; RGA— REPRESSOR OF GA, DELLA protein; SEE—standard error of the estimate; SL—strigolactone; Sug—sugars; TAA/TAR—TRYPTOPHAN AMINOTRANSFERASE related protein; TIR1/AFB—TRANSPORT INHIBITOR RESPONSE 1/AUXIN SIGNALING F‑BOX PROTEIN, auxin receptor; type B RR—a positive type B RESPONSE REGULATOR of cytokinin response; X-CK—xylem cytokinin; YUC—YUCCA, flavin monooxygenase-like enzyme.

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Kotov, A.A., Kotova, L.M. In What Way Do Gibberellins Increase Apical Dominance and Correlative Inhibition?. Russ J Plant Physiol 69, 22 (2022). https://doi.org/10.1134/S102144372202008X

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