Pollination Mechanisms and Breeding Systems in Flowering Plants

Flowering plants exhibit a remarkable diversity of pollination mechanisms and breeding systems that underpin their reproductive success and influence ecosystem function. Abiotic vectors such as wind and water contrast with biotic agents—chiefly insects, birds and bats—that transfer pollen in exchange for rewards or through deceit. Floral morphology, phenology and reward chemistry co-evolve with pollinator behaviour to optimise pollen placement and receipt. Breeding systems range from obligate outcrossing enforced by self-incompatibility through mixed-mating strategies that permit both self- and cross-fertilisation, to strict autogamy in closed flowers. Self-incompatibility systems—including gametophytic, sporophytic and late-acting variants—serve to maintain genetic diversity by rejecting self-pollen at different stages of pollen tube growth or embryo development. Heterostyly, dioecy and gynodioecy further partition sexual functions among individuals, reducing self-fertilisation and promoting allogamy. Understanding these mechanisms is critical for crop improvement, biodiversity conservation and the management of pollination services amid global declines in pollinator populations.

Research from Nature Portfolio

Recent studies have demonstrated that quantifying pollen tube growth following multiple pollinator visits yields a more accurate assessment of pollinator effectiveness than measurements based solely on single-visit pollen deposition. In a model fruit tree system, single insect visits rarely induced pollen tubes capable of fertilising ovules or producing fruit, whereas sequential visits frequently supported tube progression to the ovary and led to viable seeds. This integrative approach highlights the importance of pollen quality and tube dynamics in linking pollinator behaviour to plant reproductive success, offering a refined metric for evaluating and managing pollination services in both natural and agricultural settings.

Pollination Mechanisms and Breeding Systems in Flowering Plants publication trend

The graph below shows the total number of articles in pollination mechanisms and breeding systems in flowering plants across all publications each year (not limited to Nature Index journals).

Technical terms

Entomophily: Pollination mediated by insects.

Self-incompatibility (SI): Genetic mechanism preventing self-fertilisation, including gametophytic, sporophytic and late-acting forms.

Pollen carryover: Sequential transfer of pollen grains by a pollinator from multiple donor plants over successive visits.

Gynodioecy: Sexual system in which hermaphroditic and female individuals coexist within the same population.

References

1. Pollen tube growth from multiple pollinator visits more accurately quantifies pollinator performance and plant reproduction. Scientific Reports (2020).
2. Variation in Pollen-Donor Composition among Pollinators in an Entomophilous Tree Species, Castanea crenata, Revealed by Single-Pollen Genotyping. PLOS ONE (2015).
3. The Role of Late-Acting Self-Incompatibility and Early-Acting Inbreeding Depression in Governing Female Fertility in Monkshood, Aconitum kusnezoffii. PLOS ONE (2012).
4. Harmful self‐pollination drives gynodioecy in European chestnut, a self‐incompatible tree. American Journal of Botany (2024).