Germination Dynamics and Dormancy Mechanisms in Seeds

Seed germination is a critical developmental transition in the plant life cycle, governed by a complex interplay of physiological, molecular and environmental factors. Dormancy mechanisms ensure that germination is postponed until conditions favour seedling survival, integrating signals such as temperature, moisture and light. At the molecular level, hormonal antagonism between abscisic acid (ABA) and gibberellins (GA) serves as a central switch: high ABA levels enforce dormancy, while GA accumulation promotes the mobilisation of reserves, weakening of the surrounding tissues and radicle protrusion. The endosperm—once regarded merely as a nutritive layer—has emerged as a dynamic sensor and mediator of environmental cues, communicating with the embryo via hormone transporters and transcriptional regulators. Recent advances in single-cell transcriptomics and imaging have revealed that germination involves highly coordinated cell-type specific gene regulatory networks, while intraspecific variation in seed traits, such as size and hormone sensitivity, contributes to population-level bet-hedging strategies. A deeper understanding of these dynamics holds promise for improving crop establishment, synchronising germination and adapting agriculture to changing climates.

Research from Nature Portfolio

Recent studies have demonstrated that the endosperm functions as a temperature-sensing tissue that actively inhibits germination under high thermal stress. In Arabidopsis, endospermic phytochrome B perceives elevated temperature and shifts into its inactive form, triggering PIF-mediated accumulation of ABA in the endosperm. This ABA is then transported to the embryo to reinforce dormancy, while reciprocal repression of embryonic PIFs ensures a coordinated block on growth. Another landmark investigation has applied single-cell RNA sequencing to germinating embryos, revealing that all cell types initially adopt a common transcriptional state upon imbibition before diverging into specialised programmes. This transition is governed by dynamic gene regulatory networks and transcription factor activities, and highlights the vasculature as a key site for the earliest germination signals. Together, these findings redefine the roles of endosperm and cell identity in germination timing and environmental responsiveness.

Germination Dynamics and Dormancy Mechanisms in Seeds publication trend

The graph below shows the total number of articles in germination dynamics and dormancy mechanisms in seeds across all publications each year (not limited to Nature Index journals).

Technical terms

Dormancy: A reversible state in which viable seeds fail to germinate under otherwise favourable conditions.

Germination: The process by which a seed emerges from dormancy, absorbs water, and initiates growth of the embryo.

Abscisic acid (ABA): A plant hormone that promotes seed dormancy, inhibits germination and mediates stress responses.

Gibberellin (GA): A class of plant hormones that stimulate germination by promoting reserve mobilisation and tissue weakening.

Endosperm: A tissue surrounding the embryo that nourishes the developing plant and acts as an environmental sensor.

Transcriptional state: The pattern of gene expression within a cell at a given time, reflecting its regulatory network activity.

References

1. The Arabidopsis endosperm is a temperature-sensing tissue that implements seed thermoinhibition through phyB. Nature Communications (2023).
2. Establishment of single-cell transcriptional states during seed germination. Nature Plants (2024).
3. A commitment for life: Decades of unraveling the molecular mechanisms behind seed dormancy and germination. The Plant Cell (2024).
4. Dormancy heterogeneity among Arabidopsis thaliana seeds is linked to individual seed size. Plant Communications (2023).