Molecular Regulation of Flowering in Fruit Trees

Flowering in fruit trees represents a pivotal developmental transition controlled by a finely tuned network of environmental cues, hormonal signals and genetic regulators. Photoperiod and temperature both feed into conserved pathways that converge on the shoot apical meristem, where floral induction is orchestrated by an array of transcription factors. Central to this process are MADS-box proteins that establish floral identity, alongside key mobile signals such as FLOWERING LOCUS T homologues that integrate sugar status and day length. Phytohormones including gibberellins, cytokinins and abscisic acid modulate the balance between vegetative growth and the onset of flowering, often via feedback loops involving biosynthetic and catabolic enzymes. In perennial fruit trees, additional layers of regulation arise from alternate-bearing cycles and age-related pathways, which influence bud fate over successive seasons. A molecular understanding of these mechanisms holds promise for manipulating bloom time, improving yield stability and adapting cultivars to shifting climates, thereby underpinning sustainable orchard management worldwide.

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Molecular Regulation of Flowering in Fruit Trees publication trend

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Technical terms

Floral induction: The developmental switch in the shoot apical meristem from vegetative to reproductive identity.

Shoot apical meristem (SAM): A population of undifferentiated cells at the tip of a shoot that gives rise to all aerial organs.

Gibberellins (GA): A class of plant hormones that influence cell elongation, seed germination and often delay or repress flowering in woody perennials.

Cytokinins: Phytohormones that promote cell division and have been shown to stimulate flower bud initiation in fruit trees.

Transcriptome: The complete set of RNA transcripts produced by the genome under specific conditions or in a particular cell type.

MADS-box transcription factors: A family of DNA-binding proteins that play central roles in defining floral organ identity and the timing of flowering.

References

1. Comparative transcriptomic analysis reveals novel roles of transcription factors and hormones during the flowering induction and floral bud differentiation in sweet cherry trees (Prunus avium L. cv. Bing). PLOS ONE (2020).
2. Transcriptomic analysis reveals the regulatory module of apple (Malus × domestica) floral transition in response to 6-BA. BMC Plant Biology (2019).
3. Genetic mechanisms in the repression of flowering by gibberellins in apple (Malus x domestica Borkh.). BMC Genomics (2019).
4. Alternate Bearing in Citrus: Changes in the Expression of Flowering Control Genes and in Global Gene Expression in ON- versus OFF-Crop Trees. PLOS ONE (2012).