摘要：Cover illustration: Most Annonaceae species possess apocarpous flowers with diverse gynoecia. A study (pp. 495–509) by Chen et al.
Cover illustration: Most Annonaceae species possess apocarpous flowers with diverse gynoecia. A study (pp. 495–509) by Chen et al. of 20 species across all four subfamilies revealed the widespread occurrence of extragynoecial compita (EGC), which facilitate intercarpellary pollen-tube growth. Suprastylar EGC, mediated by stigmatic exudate and stigma connections, was identified in all subfamilies, while infrastylar EGC—newly documented in genera such as Artabotrys, Annona, and Miliusa—involves openings along carpel ventral grooves and/or basal placentation. Although Cyathocalyx exhibits a solitary carpel, vascular and developmental evidence contradicts syncarpy, suggesting that increased ovule numbers in the solitary carpel might compensate for the limitations of apocarpy. These adaptations likely enhance reproductive efficiency, supporting the family’s diversification. The image shows the gynoecium of Artabotrys hainanensis R.E.Fr., featuring moist stigmas that are in contact with each other, providing suitable conditions for suprastylar EGC. Photograph by Yanwen Chen.
Issue Information （i-iv）
Research Article
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来源：科创中国一点号
