What does this research mean for the field?

Cytokinins and abscisic acid act as auxin antagonists during adventitious root induction, limiting root development depending on plant genotype and distance to the wounding site. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To investigate the hormonal and metabolic factors responsible for differences in adventitious root formation between two contrasting Hydrangea macrophylla cultivars.

September 15, 2026PlantaOpen Access

Relationships between plant hormones, carbohydrate metabolism and excision-induced adventitious root formation of two contrasting hydrangea cultivars

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Authors

UDUwe DruegeUniversity of Applied Sciences Erfurt NMNiklas MeyUniversity of Erfurt TGTobias GeißlerUniversity of Erfurt

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Implication

Comparative physiological study reveals that elevated cytokinin and abscisic acid suppress adventitious rooting in hydrangea cuttings, suggesting local auxin antagonism restricts root induction.

Key Points

To investigate the hormonal and metabolic factors responsible for differences in adventitious root formation between two contrasting Hydrangea macrophylla cultivars.
Subjected stem cuttings of cultivars 'Clarissa' and 'Caipirinha' to 1-minute indole-3-acetic acid (IAA) pulse treatments at concentrations up to 50 mM.
Evaluated adventitious root counts, rooting zone length, and carbohydrate utilization in basal (0–1 cm) versus upper (1–2.5 cm) stem sections.
Profiled endogenous phytohormones, including IAA, cytokinins, abscisic acid, and jasmonates, across stem zones using LC-MS/MS during the first 48 hours post-excision.
Auxin pulse treatments up to 50 mM increased adventitious root count and expanded the rooting zone in 'Clarissa', matching the performance of untreated 'Caipirinha'.
Basal stem sections (0–1 cm) exhibited higher carbohydrate consumption and higher ratios of IAA to hormonal antagonists compared to the upper 1–2.5 cm zone, an effect stimulated by IAA.
Phytohormone profiling revealed significantly higher baseline levels of cytokinin and abscisic acid, alongside markedly lower IAA/cytokinin ratios, in 'Clarissa' during the 48-hour induction window.

Cite This Study

Druege et al. (2026) studied this question.

synapsesocial.com/papers/6aa913f39013453be30a25c8 https://doi.org/10.1007/s00425-026-05156-y

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Implication

Comparative physiological study reveals that elevated cytokinin and abscisic acid suppress adventitious rooting in hydrangea cuttings, suggesting local auxin antagonism restricts root induction.

Relationships between plant hormones, carbohydrate metabolism and excision-induced adventitious root formation of two contrasting hydrangea cultivars

Discussion

Member takes

Implication

Key Points

Cite This Study

Relationships between plant hormones, carbohydrate metabolism and excision-induced adventitious root formation of two contrasting hydrangea cultivars

Discussion

Member takes

Implication

Key Points

Cite This Study

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