Detection in primitive gymnosperms of proteins and glycoproteins of possible significance in reproduction

@article{Pettitt1977DetectionIP,
  title={Detection in primitive gymnosperms of proteins and glycoproteins of possible significance in reproduction},
  author={J. M. Pettitt},
  journal={Nature},
  year={1977},
  volume={266},
  pages={530-532}
}
THE modern cycads are the remnant of a gymnosperm group that has been in existence for at least 200 Myr1. Cycads are dioecious, with separate male and female plants, and fertilisation is effected by motile male gametes—so-called zooidogamous reproduction. Zooidogamy is found also in Ginkgo, another dioecious gymnosperm of considerable antiquity1. Reproduction in all other gymnosperms and in flowering plants is siphonogamous. Here fertilisation occurs through a pollen tube which conveys the non… CONTINUE READING
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