Woodland strawberry axillary bud fate is dictated by a crosstalk of environmental and endogenous factors
Andrés Jiménez, Javier (University of Helsinki. Department of Agricultural Sciences)
Caruana, Julie (University of Maryland. Department of Cell Biology and Molecular Genetics)
Liang, Jiahui (China Agricultural University. Department of Fruit Science)
Samad, Samia (Swedish University of Agricultural Sciences. Department of Biosystems and Technology)
Monfort, Amparo (Centre de Recerca en Agrigenòmica)
Liu, Zhongchi (University of Maryland. Department of Cell Biology and Molecular Genetics)
Hytönen, Timo (University of Helsinki. Department of Agricultural Sciences)
Koskela, Elli Aurora (Centre de Recerca en Agrigenòmica)

Data:	2021
Resum:	Plant architecture is defined by fates and positions of meristematic tissues and has direct consequences on yield potential and environmental adaptation of the plant. In strawberries (Fragaria vesca L. and F. × ananassa Duch. ), shoot apical meristems can remain vegetative or differentiate into a terminal inflorescence meristem. Strawberry axillary buds (AXBs) are located in leaf axils and can either remain dormant or follow one of the two possible developmental fates. AXBs can either develop into stolons needed for clonal reproduction or into branch crowns (BCs) that can bear their own terminal inflorescences under favorable conditions. Although AXB fate has direct consequences on yield potential and vegetative propagation of strawberries, the regulation of AXB fate has so far remained obscure. We subjected a number of woodland strawberry (F. vesca L. ) natural accessions and transgenic genotypes to different environmental conditions and growth regulator treatments to demonstrate that strawberry AXB fate is regulated either by environmental or endogenous factors, depending on the AXB position on the plant. We confirm that the F. vesca GIBBERELLIN20-oxidase4 (FvGA20ox4) gene is indispensable for stolon development and under tight environmental regulation. Moreover, our data show that apical dominance inhibits the outgrowth of the youngest AXB as BCs, although the effect of apical dominance can be overrun by the activity of FvGA20ox4. Finally, we demonstrate that the FvGA20ox4 is photoperiodically regulated via FvSOC1 (F. vesca SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1) at 18°C, but at higher temperature of 22°C an unidentified FvSOC1 -independent pathway promotes stolon development. Environmental conditions and apical dominance dictate woodland strawberry plant architecture by regulating axillary bud fate.
Ajuts:	Ministerio de Economía y Competitividad SEV2015-0533 Agencia Estatal de Investigación CEX2019-000902-S
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Architecture and Plasticity ; Genes ; Development and Evolution
Publicat a:	Plant physiology, Vol. 187, Issue 3 (November 2021) , p. 1221-1234, ISSN 1532-2548

DOI: 10.1093/plphys/kiab421
PMID: 34618090

14 p, 997.7 KB

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