Protoplasma

, 237:19

Starch-accumulating (S-type) sieve-element plastids in Hydatellaceae: implications for plastid evolution in flowering plants

  • Julia Tratt
  • Christina J. Prychid
  • H.-Dietmar Behnke
  • Paula J. Rudall
Original Article
  • 129 Downloads

Abstract

TEM investigation of sieve-element plastids in three species of Trithuria, the sole genus of the small aquatic family Hydatellaceae, show that P-type plastids are absent from this genus and only starch-accumulating (S-type) sieve-element plastids are present. This discovery is consistent with the recent transfer of Hydatellaceae from the highly derived monocot order Poales (grasses and their allies) to the early-divergent angiosperm order Nymphaeales (waterlilies) based on molecular phylogenetic data. Species of Poales consistently possess P2-subtype plastids, in common with other monocots, but only S-type plastids are present in Nymphaeales. The results confirm that Hydatellaceae do not belong in monocots. Optimisation of the two major types of sieve-element plastid onto a recent phylogeny of early-divergent angiosperms confirms that S-type is the primitive form and indicates that P-type sieve-element plastids have evolved more than once in angiosperms.

Keywords

Early angiosperm evolution Hydatellaceae Sieve-element plastids Trithuria Waterlilies 

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Julia Tratt
    • 1
  • Christina J. Prychid
    • 1
  • H.-Dietmar Behnke
    • 2
  • Paula J. Rudall
    • 1
  1. 1.Jodrell Laboratory, Royal Botanic Gardens, KewRichmondUK
  2. 2.HIP-ZellbiologieRuprecht-Karls-Universität HeidelbergHeidelbergGermany

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