New study uncovers universal rules shaping 400 million years of plant reproductive evolution

Date: April 23, 2026

Nanjing, China: A new study published in Biological Diversity has revealed deep evolutionary principles that have governed the reproduction of land plants over the past 400 million years. By synthesizing evidence from botany, paleobiology, and evolutionary biology, Dr. Xin Wang from the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, identified a conserved Sexual Reproductive Cycle (SRC) as the unchanging foundation of plant sexual reproduction, while diverse morphological innovations evolved as sequential modifications to this core process.

The research demonstrates that all land plants share the same fundamental SRC, consisting of alternating haploid gametophyte and diploid sporophyte generations. Despite the enormous variety of reproductive organs—including sporangia, ovules, seeds, flowers, and fruits—all evolved by adding protective and supportive structures to the SRC rather than replacing it.

Key innovations include gamete differentiation, multicellularity, sporangium protection, heterospory, endospory, and the origin of seeds and angiosperm enclosure. Dr. Wang summarized these steps as an evolutionary “staircase,” where each new structure improved Offspring Development Conditioning (ODC), enhancing survival and driving plant diversification.

The study also identifies four overarching trends: internalization of reproductive parts, expansion and invagination of floral axes, increasing dominance of the sporophyte generation, and progressive protection of developing offspring. These patterns explain the rise of ecologically dominant groups such as gymnosperms and flowering plants.

This framework provides a unified, cross-lineage understanding of plant reproductive evolution. It clarifies how conserved genetic cycles and variable morphological innovations together generated Earth’s extraordinary botanical diversity, offering new perspectives for evolutionary biology, paleobotany, and plant science.

Original Source

Wang, Xin. 2024. “Invariables and Variables in the Evolution of Plant Reproduction.” Biological Diversity 1(2): 75–82.

https://onlinelibrary.wiley.com/doi/10.1002/bod2.12016

Keywords

evolution, ODC, plant, reproduction, SRC

About the Author

Wang Xin (First Author and Corresponding Author): Level-II Researcher at the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences. He has conducted research on the cytoplasm of plant fossils and globally pioneered the observation of instantaneous physiological activities in fossil plants. He refuted a century-old erroneous theory proposed by leading authorities in Western palaeobotany, revising the origin of angiosperms to the Permian. Furthermore, he systematically synthesized advances in plant systematics and put forward a unified theory for the evolution of terrestrial plants.

About the Journal

Biological Diversity (ISSN: 2994-4139) is a new open-access, high-impact, English-language journal, devoted to advancing biodiversity conservation, enhancing ecosystem services, and promoting the sustainable use of resources under global change. It features innovative research addressing the global biodiversity crisis.