Light Regulation of Axillary Bud Outgrowth Along Plant Axes: An Overview of the Roles of Sugars and Hormones

Schneider, Anne; Godin, Christophe; Boudon, Frédéric; Demotes-Mainard, Sabine; Sakr, Soulaïman; Bertheloot, Jessica

doi:10.3389/fpls.2019.01296

Cited by 61 publications

(46 citation statements)

References 222 publications

(382 reference statements)

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“…The spontaneous induction of axillary shoots on the BAP-free medium observed in our study supports previous reports that apical stem removal halts the related dominance followed by changes in the endogenous PGRs in the nodal segments, and axillary buds start developing [ 66 , 67 , 68 ]. Similarly, the endogenous levels of PGRs were also sufficient to promote shoot growth from axillary buds in the nodal explants of other Helianthus species including H. smithii [ 33 ] and the hybrid of H. eggertii × H. annuus [ 39 ].…”

Section: Resultssupporting

confidence: 91%

In Vitro Propagation of an Endangered Helianthus verticillatus by Axillary Bud Proliferation

Nowakowska

Pavlović

Nowicki

et al. 2020

Plants

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Helianthus verticillatus (Asteraceae), whorled sunflower, is a perennial species restricted to a few locations in the Southeastern United States. Habitat loss has caused H. verticillatus to become rare, and since 2014, it has been federally listed as an endangered species. As a part of the recovery plan for the restoration and protection of H. verticillatus, an efficient micropropagation protocol based on axillary shoot proliferation was developed. Various concentrations of 6-benzylaminopurine (BAP; 0 to 4.44 µM) were examined for their morphogenetic potential in the regeneration of six genotypes of H. verticillatus from the nodal explants derived from greenhouse-grown plants. Both the BAP concentration and genotype had significant effects on the regeneration capacity of H. verticillatus. Although the induced buds were observed on ½-strength Murashige and Skoog medium without plant growth regulators, a higher rate of induction and bud development were achieved on media with either 0.88 or 2.22 µM BAP, regardless of the genotype. Successful rooting of the induced shoots was achieved within four weeks after the transfer from the induction medium to the fresh ½-strength MS medium, but the rooting efficiency was dependent on the plant’s genetic background. Regenerated plantlets, with well-developed shoots and roots, were acclimatized successfully to greenhouse conditions with a 97% survival rate. Simple sequence repeats (SSRs) markers were employed to assess the genetic uniformity of the micropropagated plants of H. verticillatus. No extraneous bands were detected between regenerants and their respective donor plants, confirming the genetic fidelity and stability of regenerated plants. To our knowledge, the protocol developed in this study is the first such report for this endangered species.

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Section: Resultssupporting

confidence: 91%

In Vitro Propagation of an Endangered Helianthus verticillatus by Axillary Bud Proliferation

Nowakowska

Pavlović

Nowicki

et al. 2020

Plants

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“…Such a reaction was also noted in the greenhouse when red LEDs were used as monochromatic light for extension of daylight, where the number of cuttings that produced new shoots was on average more than two times higher (63%) than in other light treatments (average 30%). The current knowledge revealed the key role of cytokinins and abscisic acid (ABA) synthesis in the bud in the regulation of bud growth by light (Schneider et al 2019). Light intensity stimulates production of cytokinins (inducer of bud outgrowth) in the nodal stem segment, and a low R : FR ratio stimulates the production of ABA (inhibitor of bud outgrowth) in the bud.…”

Section: Resultsmentioning

confidence: 99%

Vertical Production of ‘Konstancin’ Rose Cuttings in the Growth Chamber Under Led Light

Matysiak

2020

Journal of Horticultural Research

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The impact of light quality generated by light-emitting diodes (LEDs) on the adventitious root formation and cuttings’ quality of rose hip ‘Konstancin’ under controlled conditions in multilevel growth chamber without access to natural light and in the greenhouse was evaluated. In the growth chamber, the lighting was provided by a combination of red and blue LED arrays and white LED tubes, while in the greenhouse, red and blue LED lights were used as a supplement to natural light. The number of rooted cuttings under both growth conditions was not affected by the light conditions generated by LEDs. However, light quality showed significant effects on the biomass production and development of adventitious roots, with the most stimulating red light generated by LEDs. In the growth chamber, the root biomass of the cuttings illuminated with white LEDs supplemented with red LEDs was on average 2.2 times higher than of the cuttings illuminated with white LEDs only. A similar reaction was noted under greenhouse conditions. Supplementation of natural light with red LEDs resulted in 1.7 times increase of the fresh biomass of roots. Both in the growth chamber and in the greenhouse, illumination with red LEDs promoted axillary bud outgrowth. LED lamps can be used in the production of high-quality rose cuttings, both in greenhouses as a complement to natural light and in multilevel rooms as a sole-source lighting for plants.

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“…Shoot branching is a strictly regulated process that involves a very finely tuned hormonal and nutrient regulatory network [ 162 , 163 , 164 , 165 ] and is highly governed by environmental inputs [ 166 ]. In this intricate process, sugars and CKs behave as inducers, while auxin and strigolactones (SLs) act as repressors.…”

Section: Root and Shoot Branchingmentioning

confidence: 99%

Convergence and Divergence of Sugar and Cytokinin Signaling in Plant Development

Wang

Gourrierec

Jiao

et al. 2021

IJMS

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Plants adjust their growth and development through a sophisticated regulatory system integrating endogenous and exogenous cues. Many of them rely on intricate crosstalk between nutrients and hormones, an effective way of coupling nutritional and developmental information and ensuring plant survival. Sugars in their different forms such as sucrose, glucose, fructose and trehalose-6-P and the hormone family of cytokinins (CKs) are major regulators of the shoot and root functioning throughout the plant life cycle. While their individual roles have been extensively investigated, their combined effects have unexpectedly received little attention, resulting in many gaps in current knowledge. The present review provides an overview of the relationship between sugars and CKs signaling in the main developmental transition during the plant lifecycle, including seed development, germination, seedling establishment, root and shoot branching, leaf senescence, and flowering. These new insights highlight the diversity and the complexity of the crosstalk between sugars and CKs and raise several questions that will open onto further investigations of these regulation networks orchestrating plant growth and development.

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Light Regulation of Axillary Bud Outgrowth Along Plant Axes: An Overview of the Roles of Sugars and Hormones

Cited by 61 publications

References 222 publications

In Vitro Propagation of an Endangered Helianthus verticillatus by Axillary Bud Proliferation

In Vitro Propagation of an Endangered Helianthus verticillatus by Axillary Bud Proliferation

Vertical Production of ‘Konstancin’ Rose Cuttings in the Growth Chamber Under Led Light

Convergence and Divergence of Sugar and Cytokinin Signaling in Plant Development

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