Cytokinins and Abscisic Acid Act Antagonistically in the Regulation of the Bud Outgrowth Pattern by Light Intensity

• DOI: 10.3389/fpls.2017.01724
• Publication Date: 2017-10-10T00:38:27Z
• Authors: Adrien Corot; Hanaé Roman; Odile Douillet; Hervé Autret; Maria-Dolores Per...; Sylvie Citerne; Jessica Bertheloot; Soulaiman Sakr; Nathalie Leduc; Sabine Demotes-Ma...
• Keywords: Cutting; Plant Physiology

Bud outgrowth is a key process in the elaboration of yield and visual quality rose crops. Although light intensity well known to affect bud outgrowth, little on mechanisms involved this regulation. The objective work was test if control pattern along stem by photosynthetic photon flux density (PPFD) mediated sugars, cytokinins and/or abscisic acid intact plants. Rooted cuttings Rosa hybrida 'Radrazz' were grown growth chambers under high PPFD (520 µmol.m−2.s−1) until floral visible stage. Plants then either placed low (90 or maintained PPFD. inhibition associated with lower cytokinin sugar contents higher content stem. Interestingly, supply restored On other hand, inhibited antagonized stimulation In contrast, application sugars did not restore These results suggest that regulation involves signaling pathway which play antagonistic roles. Sugars can act as nutritional compounds may be too, but do appear main regulator response