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Ontogeny of intruding non-periplasmodial tapetum in the wild chicory,Cichorium intybus (Compositae)

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Abstract

The tapetal development ofCichorium intybus L. is investigated using LM and TEM and discussed in relation to the development in other species. During the second meiotic division the tapetal cells become binucleate and lose their cell walls. They intrude the loculus at the time of microspore release from the meiotic callose walls, which means that a locular cavity is never present in this species. During pollen development they tightly junct the exine, especially near the tips of the spines. During the two-celled pollen grain stage they degenerate and most of their content turns into pollenkitt. Until anther dehiscence they keep their individuality, which means that these intruding tapetal cells never fuse to form a periplasmodium. The ultrastructural cytoplasmatic changes during this development are discussed in relation to possible functions.

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Pacini, E., Keijzer, C.J. Ontogeny of intruding non-periplasmodial tapetum in the wild chicory,Cichorium intybus (Compositae). Pl Syst Evol 167, 149–164 (1989). https://doi.org/10.1007/BF00936403

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Key words

  • Angiosperms
  • Compositae
  • Cichorium intybus
  • Tapetum
  • pollen
  • exine
  • pollenkitt