Reproductive Biology and Pollination Ecology of Dioecious Plants

Dioecious plants, in which male and female functions occur on separate individuals, present unique challenges and opportunities for sexual reproduction. The obligatory outcrossing inherent to dioecy minimises inbreeding but can incur pollen limitation if male and female plants are widely spaced or pollinator visits are unpredictable. Many dioecious species have evolved compensatory traits such as precocious flowering, high floral synchrony, enhanced floral displays or specialised rewards to attract a diverse suite of insect, bird or mammal pollinators. Wind pollination also occurs in some temperate and island taxa, where abiotic vectors substitute for scarce biotic agents. Spatial segregation of sexes often drives sex‐specific growth patterns, with differential resource allocation to flowering and fruiting. Fruit traits in female individuals—from fleshy drupes to dry samaras—further interact with animal or wind dispersers, linking pollination ecology to seed dispersal and population dynamics. Recent advances have illuminated genetic controls of sex determination, developmental pathways for secondary sexual dimorphisms and the ecological drivers of sexual system transitions. Understanding these processes is vital for conservation of dioecious taxa in fragmented landscapes, for the sustainable management of dioecious crops and for predicting responses to climate‐driven shifts in pollinator communities.

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Reproductive Biology and Pollination Ecology of Dioecious Plants publication trend

The graph below shows the total number of articles in reproductive biology and pollination ecology of dioecious plants across all publications each year (not limited to Nature Index journals).

Technical terms

Dioecy: a sexual system in which individual plants bear only male or only female flowers.

Anemophily: pollination mediated by wind currents rather than by animals.

Xenogamy: the transfer of pollen between genetically distinct individuals, promoting outcrossing.

Phenology: the timing of life‐cycle events such as flowering and fruiting in relation to environmental conditions.

Subdioecy: an intermediate breeding system where predominantly dioecious populations also produce occasional perfect (bisexual) flowers.

References

1. Phenology and Floral Biology of Diospyros sericea A. DC. (Ebenaceae): Inconstant Males May Be behind an Enigma of Dioecy. Plants (2022).
2. Notes on the floral sexuality of some species of the tree genus Triplaris (Polygonaceae). Caldasia (2022).
3. Spatial Patterns and Drivers of Angiosperm Sexual Systems in China Differ Between Woody and Herbaceous Species. Frontiers in Plant Science (2020).