1. The effects of auxin and strigolactones on tuber initiation and stolon architecture in potato
- Author
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Efstathios Roumeliotis, Marian Oortwijn, Wouter Kohlen, Christian W. B. Bachem, Harro J. Bouwmeester, Richard G. F. Visser, and Bjorn Kloosterman
- Subjects
0106 biological sciences ,Physiology ,plant ,solanum-tuberosum ,Plant Science ,Plant Roots ,01 natural sciences ,Lactones ,Laboratorium voor Plantenveredeling ,Plant Growth Regulators ,Gene Expression Regulation, Plant ,Arabidopsis ,tuberization ,Laboratorium voor Plantenfysiologie ,Plant Proteins ,chemistry.chemical_classification ,0303 health sciences ,Plant Stems ,Stolon ,Transcriptional Networks ,food and beverages ,Drug Synergism ,Plants, Genetically Modified ,Plant Tubers ,Phenotype ,Shoot ,key role ,Laboratory of Plant Physiology ,Research Paper ,growth ,Auxin, auxin content, gibberellins, potato, strigolactones, tuberization physiology, YUC ,Strigolactone ,Biology ,03 medical and health sciences ,Auxin ,Triiodobenzoic Acids ,Axillary bud ,Botany ,Solanum tuberosum ,030304 developmental biology ,Indoleacetic Acids ,fungi ,Biological Transport ,biology.organism_classification ,gene-expression ,Plant Leaves ,Plant Breeding ,arabidopsis ,chemistry ,transport ,identification ,EPS ,biosynthesis ,010606 plant biology & botany ,Explant culture - Abstract
Various transcriptional networks and plant hormones have been implicated in controlling different aspects of potato tuber formation. Due to its broad impact on many plant developmental processes, a role for auxin in tuber initiation has been suggested but never fully resolved. Here, auxin concentrations were measured throughout the plant prior to and during the process of tuber formation. Auxin levels increase dramatically in the stolon prior to tuberization and remain relatively high during subsequent tuber growth, suggesting a promoting role for auxin in tuber formation. Furthermore, in vitro tuberization experiments showed higher levels of tuber formation from axillary buds of explants where the auxin source (stolon tip) had been removed. This phenotype could be rescued by application of auxin on the ablated stolon tips. In addition, a synthetic strigolactone analogue applied on the basal part of the stolon resulted in fewer tubers. The experiments indicate that a system for the production and directional transport of auxin exists in stolons and acts synergistically with strigolactones to control the outgrowth of the axillary stolon buds, similar to the control of above-ground shoot branching.
- Published
- 2012
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