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  • Amborella trichopoda

    Genetic sex determination and sexual instability in Amborella trichopoda

    Amborella trichopoda, the sister species of all other extant angiosperms, is typically dioecious, producing male and female flowers on separate individuals. Anger et al. map sex phenotypes onto a phylogeny of basally diverging angiosperms using maximum parsimony. Sex-ratios and phenotypes were studied in parallel over two consecutive flowering seasons for an ex situ population of […] More

  • Environmental regulation of sex determination in oil palm (Review)

    Environmental regulation of sex determination in oil palm (Review)

    In the African oil palm, Elaeis guineensis, male and female inflorescences are produced separately in an alternating cycle that is influenced by the environment: stress conditions promote male flowering, but the underlying mechanisms of this process are unknown. Adam et al. review current knowledge of sex differentiation in oil palm together with perspectives gained from other […] More

  • Date palm flowers

    Flower unisexuality in dioecious date palm

    Dioecy has evolved independently several times during the evolution of flowering plants, but knowledge of the mechanisms involved is poor. Phoenix dactylifera is a dioecious species displaying strong dimorphism between pistillate and staminate flowers, and Daher et al. (pp. 255–266) describe the transition of reproductive buds from a bisexual to a unisexual stage. They find […] More