Repatterning of the inflorescence meristem in Gerbera hybrida after wounding.

Szczegóły
Abstrakt

Tytuł:: Repatterning of the inflorescence meristem in Gerbera hybrida after wounding.
Autorzy:: Zhang T; Department of Agricultural Sciences, Viikki Plant Science Centre, University of Helsinki, P.O.Box 27, 00014, Helsinki, Finland.
Wang F; Department of Agricultural Sciences, Viikki Plant Science Centre, University of Helsinki, P.O.Box 27, 00014, Helsinki, Finland.
Elomaa P; Department of Agricultural Sciences, Viikki Plant Science Centre, University of Helsinki, P.O.Box 27, 00014, Helsinki, Finland. .
Źródło:: Journal of plant research [J Plant Res] 2021 May; Vol. 134 (3), pp. 431-440. Date of Electronic Publication: 2021 Feb 04.
Typ publikacji:: Journal Article
Język:: English
Imprint Name(s):: Publication: 2002- : Tokyo ; New York : Springer-Verlag Tokyo
Original Publication: Tokyo : Botanical Society of Japan, c1993-
MeSH Terms:: Asteraceae*/genetics
Meristem*/genetics
Meristem*/metabolism
Gene Expression Regulation, Plant ; Indoleacetic Acids ; Inflorescence/genetics ; Phylogeny ; Plant Proteins/metabolism ; Plants, Genetically Modified/metabolism
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Grant Information:: 1310318 Academy of Finland; 00201200 Suomen Kulttuurirahasto
Contributed Indexing:: Keywords: Asteraceae; Auxin; Flower head; Laser ablation; Phyllotaxis; Wounding
Substance Nomenclature:: 0 (Indoleacetic Acids)
0 (Plant Proteins)
Entry Date(s):: Date Created: 20210205 Date Completed: 20210511 Latest Revision: 20210731
Update Code:: 20240104
PubMed Central ID:: PMC8106577
DOI:: 10.1007/s10265-021-01253-z
PMID:: 33543368
: Czasopismo naukowe

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The Asteraceae plant family is characterized by inflorescences, called flower heads or capitula that may combine hundreds of individual florets into a single flower-like structure. The florets are arranged in a regular phyllotactic pattern with Fibonacci numbers of left- and right-winding spirals. Such a pattern may be disrupted due to physical constraints or by wounding occurring during the early meristem development. Recovery from wounding re-establishes patterning although the mechanisms have remained elusive. In this study, we applied Gerbera hybrida as a model system and established methods to conduct wounding experiments either with syringe needles or using laser ablation combined with live imaging of head meristems. By revisiting the historical experiments in sunflower, we conducted wounding to transgenic auxin reporter lines of gerbera and followed the recovery of cellular growth and meristem patterning. We show that wounding disrupted the expression of the gerbera CLAVATA3 (GhCLV3) gene that marks the undifferentiated meristematic region and led to de novo re-initiation of patterning at the wound margin. During the recovery growth, three to five layers of elongated cells showing periclinal cell division planes and lacking auxin signal were formed at the wound rim. DR5 auxin signal was shown to localize and form regularly spaced maxima in a distance from the wound rim. Consequently, spiral pattern of contact parastichies was re-established by stacking of new auxin maxima on top of the previous ones. The developed methods facilitate future studies on understanding the molecular mechanisms of de novo patterning of meristems.

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