The fig family (Moraceae) has fascinated botanists for generations. The family shows an extraordinary diversity in flower form and mode of pollination. We recently examined the reproductive biology of two highly unusual and poorly known relatives of the fig: Dorstenia contrajerva, native to Mexico, Central America, the Caribbean and South America, and D. lujae, native to tropical Africa. Our paper (NJB-01832) describes the floral biology of these elusive species which, along with other fig relatives, may provide novel insights into how their relative, the fig, may have evolved.
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The fig family contains several economically and ecologically important plants such as the fig (Ficus), mulberry (Morus) and breadfruit (Artocarpus). Figs are also among the earliest domesticated crops and have been cultivated for over 11,000 years. The biology of most relatives of the fig remains completely unexplored and could offer insight into the evolution of these economically and ecologically important plants.
Although data on obscure, tropical fig relatives is lacking, there have been extensive studies into the reproductive biology of the fig itself. Figs are intimately associated with specific species of wasp, with which they have evolved together for at least 60 million years. The familiar fig is, botanically speaking, actually a syconium – an infolded structure within which the tiny flowers are enclosed, which never see the light of day. Fig wasps (Agaonidae: Hymenoptera) crawl into the fig through a tight passageway called an ostiole, into a central cavity where the flowers are produced. They carry pollen from another fig and fertilise some of the tiny flowers, whilst laying their eggs in others. Flowers which receive an egg develop a gall which the wasps’ grubs feed on; meanwhile flowers which receive pollen develop seeds. Emergent wingless male wasps mate with winged females, which collect pollen as they crawl around the inside of the fig; the fertilised and pollen-laden female wasps then bite their way out, and fly off to find new figs to lay their eggs in.
Our hypothesis that Dorstenia may be reminiscent of an intermediate form in the evolution of this fascinating fig-fig wasp symbiosis is corroborated by a fascinating recent observation, by scientists, of flies laying eggs in the Dorstenia flowers. This exciting observation adds weight to the hypothesis that egg-laying by insects is a common trait that predated the origin of the intimate fig-wasp association that has now become a textbook example of co-evolution.