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Nymphaea seeds exhibit diverse dormancy types, with physiological dormancy (PD) in some species and morphophysiological dormancy (MPD) in others. This suggests PD may be the ancestral trait in Nymphaea, challenging previous assumptions.

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Area of Science:

  • Plant biology
  • Seed science
  • Evolutionary botany

Background:

  • Morphophysiological dormancy (MPD) is hypothesized as the basal seed dormancy type in angiosperms.
  • Only physiological dormancy (PD) has been previously reported in seeds of the ANA-grade genus Nymphaea.

Purpose of the Study:

  • To investigate the types of seed dormancy present in six Australian Nymphaea species.
  • To clarify the dormancy status in a genus previously thought to possess only PD.

Main Methods:

  • Seeds of six Nymphaea species were subjected to varying temperatures, light conditions, and germination stimulants.
  • Germination rates and embryo growth prior to germination were monitored.

Main Results:

  • Germination rates were generally low (<10%) under control conditions.
  • Optimal germination occurred at 30-35°C with light, ethylene, or anoxia.
  • Embryo growth preceded germination in five species, indicating dormancy release.

Conclusions:

  • Seeds of Nymphaea lukei and N. immutabilis exhibited PD, while N. macrosperma, N. ondinea, and N. violacea showed MPD.
  • MPD is found in more phylogenetically derived clades within Nymphaea, suggesting PD is the basal trait in Nymphaeales.
  • The study reveals a wider range of seed dormancy and germination strategies within ANA-grade angiosperms than previously recognized.